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Fabrication of Non-volatile Charge Storage Memory Device by Novel doped ZnO nanoparticles with 4.79 eV bandgap. SOUDIP SINHA ROY Theoretical Physicist Quantumorbit Synthesis Pvt. Ltd., India soudipsinharoy@(gmail.com, physicist.net) Fabrication of Non-volatile Charge Storage Memory Device by Novel doped ZnO nanoparticles with 4.79 eV bandgap SOUDIP SINHA ROY Theoretical Physicist Quantumorbit Synthesis Pvt. Ltd., India soudipsinharoy@(gmail.com, physicist.net) Full text Abstract N owadays, the drastic participation of the nanosized materials in technology have been implicated with various applications which mainly aims the performance optimization, dimensional downscaling , ultra-low power consumption etc. to overcome the fundamental limits of the microscale devices. It is the requisite stage to familiarize a convenient alternative of the traditional large-scale technologies in the purpose of accelerating the flow of the applied science for mankind. This article presents two novel non-volatile device structures which are fabricated by layer by a layer deposition method. I-V measurements for both the samples justify the device characteristic as p-type –insulator–n-type configuration. The measurements confirm that the successful fabrication of those devices and proves the high-density charge capacity with an improved lifetime of the carriers compared to erstwhile reports. The measured the threshold voltage for this device is 0.939V. Diode characteristic of the fabricated device Keys: Zinc oxide, charge storage devices, quantum physics, nanotechnology 1. Introduction To unfold the hidden mysteries of the molecules and their applications the nanoscience have been presented plenty of its morphism in order to rapid performance scale up with drastic dimensional down scaling . Manipulation of the molecular information technology has numerous existing approaches for instance molecular non-volatile memory , electron spin devices, nano- memorister , quantum dot island based devices, capacitive devices etc. which have proven their superior activities in binary logic and storage device applications. Nowadays, the utility of the hard storage has become quite crucial and instantaneous which claims to be tinier and fastest to meet the present requirements of the mankind . The fabrication of the non-volatile charge storage devices opens a convenient way with millions charge storing capacity in a few nanometer areas . In this letter the ZnO nanoparticle-based non-volatile memory device has reported which provides a better optimization to the device efficiency. To fabricate this device three major materials have involved those are PMMA, Ag NPs, ZnO NPs. In another type of the device is fabricated by using Nafion which exhibits a benchmarking of the p- i-n diode. The PMMA layer is used as the tunneling barrier for the electrons that provides a path to the electrons to be tunnelled during the biasing application but resistance during cutoff state. It also acts as the high impedance to the electrons during cutoff state that resists from the discharging by defending the reverse tunnelling . To fabricate this device the ZnO and Ag doped ZnO NPs are utilized and specifically sputtered on the surface of the ITO. Two different types of devices have been walked through firstly ITO/PMMA/Nafion has been examined and next is ITO/PMMA /ZnO-NPs doped with Ag NPs. The reduced bandgap of the doped ZnO layer works as the electron hopping state and allows to operate it at ultra-low power input. 2. Background of Non-volatile Memory Devices Since the last twenty years of the 19th century, the advancement of the nanotechnology has bequeathed a lot of novel applications to the current technology to accelerate its current flow over its fundamental limits. The molecular technology has eliminated various complications in the device fabrication and operation for instance impurity inconsistency, thermal carrier diffusion, elevated outlay of photolithography etc. which genuinely overcomes the unwanted faults in circuit and strictly shrinks the number of superposition states. In the recently published article it is reported that [1,2] the tunneling current depends on the barrier resistivity which tunneling get violated dynamically due to the operating temperature variation. Therefore, the temperature stability is also a key point which rights to be high to opt the ultimate device performance. The synthesis of the non-volatile memory devices through the molecular thin film technology has already been taken care of before a couple of years. The floating gate MOS devices also acceptable performances in charge storing but those have the less storage density and lower speed of operation. The involvement of the nanoparticles induce a high surface area with the wide bandgap that imposes to store high density data and optimized operating speed with ultralow power consumption and minute faults.exhibits between the ITO and the Ag NPs layer. Another report communicates that the structure ITO/a-C/ZnO/a-C/Al contact also exhibits very high optimization in switching rate and the charge storage capability where two a-C has incorporated which acts ITO/PMMA/Ag NPs based device has already been reported previously which exhibits superior performance adaptability [2]. The ON/OFF ratio (switching rate) has also improved drastically due to the incorporation of the PMMA layer as a typical insulator [1]. 3. Preparation of respective nanoparticles The following nanoparticles are used in the device fabrication process. The process of synthesis of that nanomaterial is very easy, cheaper and time efficient. The involved chemicals have easy commercial availability. The list of chemicals is as follows. Sodium Borohydrate (NaBH4); AgNO3; PVP; Zinc Acetate-dihydrate (Zn(COOCH3)2.2H2O); Isopropyl Alcohol (CH3CH2CH2OH); Ethanolamine (C2H7NO). 3.1. ZnO NP preperation method As a precursor commercially available Zinc Acetate-dihydrate (Zn(COOCH3)2.2H2O) salt was used and dissolved into Isopropyl Alcohol ( CH3 CH2 CH2 OH ) having molar mass 60.09 g/mol. The final obtained solution was 0.5M. Afterwards, the solution was put in stirring and the Ethanolamine (C2H7NO) was added drop-wise during stirring at constant 80 C temperature until the gel is formed. After obtaining the gel the sample was dried at 35C until the solvent is completely evaporated out. However, the organic solvent evaporates faster in rate even at room temperature. 3.2. Ag NP preparation method With the 60ml of distill water, the 0.004M NaBH4 was dissolved and kept for 30 min at continuous stirring in an ice bath. During stirring gently add 4ml of 0.002M AgNO3 dropwise until the colour of the solution is converted into light yellow. Once the desired colour is achieved 0.3% PVP as the capping agent was gently added. Afterwards, store the prepared solution immediately in dark space to avoid the particle agglomeration. 3.3. Ag-doped ZnO nanopowder preperation method As a precursor commercially available Zinc Acetate-dihydrate (Zn(COOCH3)2.2H2O) salt was used and dissolved into Isopropyl Alcohol ( CH3 CH2 CH2 OH ) having molar mass 60.09 g/mol. The final obtained solution was 0.5M. Afterwards, the solution was put in stirring and the Ethanolamine (C2H7 NO) was added drop-wise during stirring at constant 80 C temperature until the gel is formed. After the ZnO gel formation, the 5% concentric AgNO3 was added dropwise while stirring at 6000 rpm inside an ice bath. Once the doping is successful then by centrifuging the sample and washing by MEA several times bright white coloured Ag-doped ZnO nanopowder was obtained. Figure 1 | (a) UV-vis measurement for the pure ZnO NPs (50nm), (b) Zoomed view for further clarification As the UV visible optical bandgap approximation asserts that B.G.= 1240/lamda eV. Therefore, the calculate B.G. of this above ZnO sample is given by 1240/258.40= 4.79 eV. The bandgap for a pure ZnO nanoparticle is at around ~3.2eV which response to 380nm UV wavelength. But in this case the bandgap is found with an unexpected increment which responded at 258.40 nm UV wavelength. In the next context this reason will be revealed out. Research is going on, on this topic. 4. Device Fabrication The fabrication is the ultimate step for providing a physical aspect to any theoretical substance. In this case, two different types of devices have been fabricated fig. 2 is the ITO/PMMA/ZnO NPs based device. This device operates with the basic fundamental process of the charge trapping and hopping states. But the second device fig. 3 operates with the reduced bandgap of the ZnO through Ag doping and results in the ultra-low power operating with optimized ON/OFF ratio. 4.1. ITO/PMMA/Naffion structured device The chemical formula of the nafion is C7HF13O5SC2F4·. Initially, the ITO was repeatedly cleaned by the concentric ethanol and the acetone in the ultrasonicator then it was dried at an hour at room temperature. After that, the ITO was exposed to the PMMA by a suitable spin coater and kept for 24 hrs. at room temperature for drying purpose. The grown thickness in 40nm. Once the drying is completed then highly purified nafion was drop casted onto the dried PMMA surface of the ITO and dried for 24 hrs. at room temperature. Figure 2 | ITO/PMMA/Nafion structured device 4.2. ITO/PMMA/Ag-doped ZnO device The fabrication process Initially, the ITO was repeatedly cleaned by the concentric ethanol and the acetone in the ultrasonicator then it was dried at an hour at room temperature. After that, the ITO was exposed to the PMMA and kept for 24 hrs. at room temp. for drying purpose. Once the drying is completed then the pre-synthesized Ag-doped ZnO nanopowder was diluted into the 2 propanols and was sputtered onto the dried PMMA surface of the ITO and 100 nm thicker thin film was produced. After that, the sample was kept at vacuum for 48 hrs in special purpose. Figure 3 | ITO/PMMA/Ag NPs/Ag-doped ZnO structured device 5. Performance Justification Through I-V and C-V Measurement 5.1. I-V measurement of the naffion based device. I-V measurement is the technique which allows to investigate the current verses voltage mapping for any multipolar device. In this case both the fabricated devices are the bipolar systems those are verified through I-V measurements. Figure 4| I-V measurement curve for the ITO/PMMA/Nafion based device From above graph figure 4, it is well visible that the curve is similar to the semiconductor diode where the electrons forward current is 2.39889e-9 A. The current is high compared to the previously reported devices [2]. This high current stands for the high probability of the electrons to be found in the conduction band of the Nafion. Once the electrons are subjected to the electromotive field then gradually those try to overcome the PMMA barrier interface (thickness 250nm) and after a certain voltage, the tunneling phenomena of the electrons are observed which is clear from the fig. 3. Within the potential range of 0.831V to 0.939V there has a transition of the electron which gives a small valley peak that satisfies the electron tunneling effect through the thin PMMA film. The upper valley provides 1.422e-9 A current which instantly falls down at 1.4444e-10 A. From 0.939V this device exhibits the standard diode characteristics. Therefore, the threshold voltage for this device is 0.939V. The measurement from -2V to +2V assures that this diode characteristic is well justified and meet with the standard semiconductor devices. 5.2. C-V measurement of the Nafion based device Cyclic voltammetry measurement for the nafion based sample. Keeping K+ ions in the solution the CV measurement was performed. Figure 5| I-V measurement curve for the ITO/PMMA/Nafion based device with the I-V four-probe measurement system Figure 6| C-V measurement curve for the ITO/PMMA/Nafion based device According to the C-V analysis if the device is fully reversible then obviously ipa/ipc should be equal to 1. But in this case this ration deviates from one by the factor of 4.3170. The anodic current IPA is 0.000351429A and the cathodic current is 0.00151714A. In case of forward cycle, the current is comparatively high to the reverse cycle. Therefore, it is identified that this device is having a non-volatility nature. This non-volatile nature is in form of charge shoring capacity. The specified interval between two cycles forward and reverse is 2sec. 5.3. I-V measurement of the Ag-doped ZnO based device. Figure 7| I-V measurement curve for the ITO/PMMA/Ag-doped ZnO NPs based device From this measurement curve figure 7, it is seen that that curve is following the standard p- i-n characteristics. The incorporation of the intermediate insulating layer differs the device from the general p-n diode semiconductors where the p-type and the n-type semiconductors are attached and separated by the self-induced insulating layer called the depletion layer. But when this depletion layer is mask fabricated then the device characteristics changes to the p- i-n characteristics where the electron tunneling takes place through the insulating layer. Depending on the thickness of the tunneling barrier tunneling current varies and gives a search tunneling current which typically provides an oscillation as shown in figure 8. According to the measurement curve , the maximum stable current output is obtained at 3.984V is 3.2e-5 A. The measured threshold voltage for this device is 0.339V. The full frame of the graph is shown below, where the highlighted part of the graph is having a noise like phenomena which is mostly caused by the unwanted and uncontrolled electron tunneling within the applied potential range, figure 8. Figure 8| Complete curve of I-V measurement curve for the ITO/PMMA/Ag-doped ZnO NPs based device. 6. Conclusion This work is performed for fabricating the non-volatile devices based on ZnO and metal-doped ZnO nanoparticles. In collaboration with the four probe I-V characteristics measurement, the devices have proven that both are having a non-volatile nature and the those are having very less threshold voltage which can trigger device at very low power. The improvement in the charge storage capacity is notable in both the devices. The unexpected bandgap for the ZnO is being verified through several observations and experiments. In the future articles, this may come across. References [1] Fushan Li, et.al. , "Nonvolatile Memory Effects of ZnO Nanoparticles Embedded in an Amorphous Carbon Layer", Japanese Journal of Applied Physics 49 (2010) 070209. [2] Biswanath Mukherjee and Moumita Mukherjee, "Nonvolatile memory device based on Ag nanoparticle: Characteristics improvement" Applied Physics Letters 94, 173510 (2009); doi : 10.1063/1.3127233. [3] V. L. Covin, M. C. Schlamp, and A. P. Alivisatos: Nature (London) 370 (1994) 354. [4] T. Homma, T. Kutsuzawa, K. Kunimune, and Y. Murao: Thin Solid Films 235 (1993) 80. [5] M. Horie: J. Vac. Sci. Technol. A 3 (1995) 2490. [6] S. Mizuno, A. Verma, H. Tran, P. Lee, and B. Nguyen: Thin Solid Films 283 (1996) 30. [7] H. J. Ko, K. M. Lee, H. J. Lee, and C. K. Choi: Thin Solid Films 506–507 (2006) 8 . [8] Z. J. Donhauser, B. A. Mantooth, K. F. Kelly, L. A. Bumm, J. D. Monnell, J. J. Stapleton, Jr., D. W. Price, A. M. Rawlett , D. L. Allara, J. M. Tour, and P. S. Weiss, Science 292, 2303 2001 .

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Physics Tomorrow Theoretical Physics Letters TPL is an international thrice reviewed journal which publishes the novel research and review articles on every dimension of the physics. The current impact factor is 1.4 as per 2019 update. On Subquantum Electromagnetic and Gravitational Interactions Javier Joglar Alcubilla Department of Avionics Barajas College, Spain Read Download full text Vol. 1 submission is over. Read the vol. 2 papers. Submit your paper at, ptlsubmission@gmail.com

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Post the acceptance formalities for a manuscript. Post the acceptance the author should follow the following steps on or before 20 days to publish their articles. Post the acceptance the author should follow the following steps on or before 20 days to publish their articles. The author must be punctual enough on submitting the revised manuscript as per the reviewers guidelines will be sent to the author after a quality review. The author also to be punctual on the honorarium submission for the publication of the manuscript. The honorarium can be submitted online. Once a manuscript is accepted within 12 hours the payment link will be published via an email with the goldendoc to the authors. The payment acknowledgement typically sent to the authors within 12 hours of the payment. The APC payment process is completely guided after the acceptance of the manuscript. The website of the honorarium payment can not be used for the international transactions. On the payment portal, several transaction methods are available like UPI transfer, NEFT, IMPS, Credit Card, Debit card etc. for Indian authors and for USA and UAE countries PayPal, wise and Paysend. If the author does not pay the honorarium within 10 days of the acceptance of the manuscript goes on hold for at least for 15 days. This process is maintained to adjust the punctuality of the released volume. The volumes are released each month in a single release. Therefore, the delay from the author side causes the delay of the publication of the whole volume. To reduce this delay, the already paid honorarium papers are released on time and rest manuscripts go on hold for possible publication in the next volume. If a manuscript goes on hold then the authors can request for the re-publication of the same at our publication department. After a board meeting by PTCI (Physics Tomorrow Council Of India) the decision on the manuscript is taken later as per the current status and acceptance rates. If any author wants to withdraw any manuscript he/she needs to report to the publication desk before 10 days from the acceptance letters delivery to the author. The withdraw charge is 60% of the paid APC untill the 10th day and afterwords no reversal will be granted. Open Access fees refund policy is same as APC reversal terms and conditions. Note theer will be no refund granted for the manuscript editing or any special services. For the autowithdraw manuscript APC refund is not possible. If an author delays the response on the accepted manuscripts then there has a buffer period of 40 days from the acceptance date. After the buffer period has been completed the manuscript falls under the auto withdraw policy https://www.wikipt.org/manuscript-withdrawal-request-pt l which allows the publisher to withdraw the accepted manuscripts without any prior notice. If a manuscript gets auto withdrawn then the author falls under the Infringement policy. After the infringement policy is applied to an author, then the author will get blocked for two years minimum from all SCI and SCOPUS indexed journals.

Meet with the science affiliated people worldwide in Physics Tomorrow Scientific Members pannel. We provide a community to speak together for exchanging the knowledge with each other at no cost. You are welcomed to share your questions, published or unpublished manuscripts to grow your research. Welcome to the Physics Tomorrow scientific gateway Meet with the science affiliated people worldwidely in Physics Tomorrow Scientific Members pannel. We provide a community to speak together for exchanging the knowledge with each other at no cost. You are welcomed to share your questions, published or unpublished manuscripts to grow your research. Email to Get for a verified badge Click here to open.

Physics Tomorrow Chemistry journal publishes the articles relevant to the chemistry. Physics Tomorrow Chemistry Letters (PTCL) Impact Factor UPDATING Word of the editor. | PTCL is an open access international journal which covers the recent trends of theoretical and experimental chemistry. This aims to provide a great opportunity to the lead researchers worldwide for publishing their valuable works at free of cost. Because I believe that great ideas are priceless. Submit your paper at ptlsubmission@gmail.com For further information visit wikipt.org/ptl Paper template .doc Cover letter templete .doc Contact- head.editor@wikipt.org Lets propose a special issue Submit your manuscript See the publication honorarium Basic information Home Support About Email Submit your manucript Online submssion Email submission Impact factors Manuscript preparation Join as Editor Reviewer Read Priprints release Extended indexing Science Citation (SCI) Scopus Submission is open Website is designed simply. Get anything from the search bar. PTL does not have any last submission date. We accept submissions always. PTL fellowship Best paper award Research sponsorship June submissions will be eligible for award and fellowship. Get is published earlier to apply for it later.

Physics Tomorrow Letters is the online research publication platform. SCI and Scopus indexed journal. Rapid publication. https://static.wixstatic.com/media/04176b_8a165ed0f46f43d09e08845ad6136171~mv2.jpg Hello This is your About Page. It's a great opportunity to give a full background on who you are, what you do, and what your website has to offer. Double click on the text box to start editing your content and make sure to add all the relevant details you want to share with site visitors. My Story This is your About page. This space is a great opportunity to give a full background on who you are, what you do and what your site has to offer. Your users are genuinely interested in learning more about you, so don’t be afraid to share personal anecdotes to create a more friendly quality. Every website has a story, and your visitors want to hear yours. This space is a great opportunity to provide any personal details you want to share with your followers. Include interesting anecdotes and facts to keep readers engaged. Double click on the text box to start editing your content and make sure to add all the relevant details you want site visitors to know. If you’re a business, talk about how you started and share your professional journey. Explain your core values, your commitment to customers and how you stand out from the crowd. Add a photo, gallery or video for even more engagement. Contact I'm always looking for new and exciting opportunities. Let's connect. info@mysite.com 123-456-7890