Pub Date : 2021-12-12DOI: 10.1109/NMDC50713.2021.9677539
Tory A. Welsch, Jill M. Cleveland, D. Chase, M. Doty
Colloidal quantum dots (QDs) are promising materials for photon upconversion, the process by which multiple low-energy photons are absorbed and one higher-energy photon is emitted. Recent efforts have focused on developing complex multi-shell and nanorod-based heterostructures as efficient photon upconverters for solar energy harvesting applications. Here we present a CdTe/CdS/CdSe core/shell/shell QD platform for photon upconversion with several advantages over an analogous rod-based platform. This tunable platform featuring a thick CdS layer can realize a significant shift toward the optimal wavelengths for solar energy harvesting. As a first step toward realizing upconversion in this platform, we modify established colloidal synthesis procedures to enable a high degree of control over particle morphology and size. Through transmission electron microscopy (TEM) and photoluminescence (PL) characterization, we confirm successful product formation with a high degree of control over the shell thicknesses and resulting PL emission wavelengths. We also synthesize CdTe/CdS intermediates with CdS layers of various increasing thicknesses, an important tool to facilitate the charge carrier separation necessary for efficient photon upconversion.
{"title":"Synthesis of Colloidal Quantum Dot Nanostructures for Photon Upconversion","authors":"Tory A. Welsch, Jill M. Cleveland, D. Chase, M. Doty","doi":"10.1109/NMDC50713.2021.9677539","DOIUrl":"https://doi.org/10.1109/NMDC50713.2021.9677539","url":null,"abstract":"Colloidal quantum dots (QDs) are promising materials for photon upconversion, the process by which multiple low-energy photons are absorbed and one higher-energy photon is emitted. Recent efforts have focused on developing complex multi-shell and nanorod-based heterostructures as efficient photon upconverters for solar energy harvesting applications. Here we present a CdTe/CdS/CdSe core/shell/shell QD platform for photon upconversion with several advantages over an analogous rod-based platform. This tunable platform featuring a thick CdS layer can realize a significant shift toward the optimal wavelengths for solar energy harvesting. As a first step toward realizing upconversion in this platform, we modify established colloidal synthesis procedures to enable a high degree of control over particle morphology and size. Through transmission electron microscopy (TEM) and photoluminescence (PL) characterization, we confirm successful product formation with a high degree of control over the shell thicknesses and resulting PL emission wavelengths. We also synthesize CdTe/CdS intermediates with CdS layers of various increasing thicknesses, an important tool to facilitate the charge carrier separation necessary for efficient photon upconversion.","PeriodicalId":6742,"journal":{"name":"2021 IEEE 16th Nanotechnology Materials and Devices Conference (NMDC)","volume":"50 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81360230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-12DOI: 10.1109/NMDC50713.2021.9677530
Kiyoteru Kobayashi, Soichiro Nakagawa
The conduction current flowing through silicon nitride-silicon dioxide stacked films under negative gate bias at high temperatures has been analyzed and the electron transport mechanism in the stacked films has been studied. The trap depth for electrons in the silicon nitride film used in this work was estimated to be 1.3 eV, which was deeper as compared to that for holes (~1.0 eV). Next, the trap depths for electrons and holes in silicon nitride films with two different N/Si composition ratios were compared. Both trap states for electrons and holes were deeper in the silicon nitride film with the higher N/Si composition ratio. The analysis of the conduction current through silicon nitride-silicon dioxide stacked films is useful to evaluate the energy depth of trap states for electrons existing in silicon nitride films.
{"title":"Electrical analysis of energy depth of electron trap states in silicon nitride films for charge-trap flash memory application","authors":"Kiyoteru Kobayashi, Soichiro Nakagawa","doi":"10.1109/NMDC50713.2021.9677530","DOIUrl":"https://doi.org/10.1109/NMDC50713.2021.9677530","url":null,"abstract":"The conduction current flowing through silicon nitride-silicon dioxide stacked films under negative gate bias at high temperatures has been analyzed and the electron transport mechanism in the stacked films has been studied. The trap depth for electrons in the silicon nitride film used in this work was estimated to be 1.3 eV, which was deeper as compared to that for holes (~1.0 eV). Next, the trap depths for electrons and holes in silicon nitride films with two different N/Si composition ratios were compared. Both trap states for electrons and holes were deeper in the silicon nitride film with the higher N/Si composition ratio. The analysis of the conduction current through silicon nitride-silicon dioxide stacked films is useful to evaluate the energy depth of trap states for electrons existing in silicon nitride films.","PeriodicalId":6742,"journal":{"name":"2021 IEEE 16th Nanotechnology Materials and Devices Conference (NMDC)","volume":"13 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87906594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-12DOI: 10.1109/iccve.2013.6799756
K. Kircanski
Welcome to Sofia and the IEEE JVA 2006 Symposium on Modern Computing. The symposium features 3 keynote addresses and 38 invited and contributed papers in topic areas corresponding to the four tracks of the symposium – Information Systems and Grid Technologies, Advanced Algorithms and Applications, Complex and Intelligent Systems, and High Productivity Computing. It is particularly positive to see a number of young researchers’ studies included as papers in these proceedings, and we will have even more young colleagues presentations at the JVA 2006 Symposium Posters Session. In addition, tutorial lectures on the 3 of October and panel discussions are also part of the symposium program. This is a rich and diverse program, and I am confident that these presentations will bring interesting new perspectives to research in modern computing.
{"title":"Welcome from the Program Chair","authors":"K. Kircanski","doi":"10.1109/iccve.2013.6799756","DOIUrl":"https://doi.org/10.1109/iccve.2013.6799756","url":null,"abstract":"Welcome to Sofia and the IEEE JVA 2006 Symposium on Modern Computing. The symposium features 3 keynote addresses and 38 invited and contributed papers in topic areas corresponding to the four tracks of the symposium – Information Systems and Grid Technologies, Advanced Algorithms and Applications, Complex and Intelligent Systems, and High Productivity Computing. It is particularly positive to see a number of young researchers’ studies included as papers in these proceedings, and we will have even more young colleagues presentations at the JVA 2006 Symposium Posters Session. In addition, tutorial lectures on the 3 of October and panel discussions are also part of the symposium program. This is a rich and diverse program, and I am confident that these presentations will bring interesting new perspectives to research in modern computing.","PeriodicalId":6742,"journal":{"name":"2021 IEEE 16th Nanotechnology Materials and Devices Conference (NMDC)","volume":"61 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79597590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-12DOI: 10.1109/nmdc50713.2021.9677526
{"title":"2021 IEEE 16th Nanotechnology Materials and Devices Conference (NMDC) Welcome from the General Chairs","authors":"","doi":"10.1109/nmdc50713.2021.9677526","DOIUrl":"https://doi.org/10.1109/nmdc50713.2021.9677526","url":null,"abstract":"","PeriodicalId":6742,"journal":{"name":"2021 IEEE 16th Nanotechnology Materials and Devices Conference (NMDC)","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73536529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-12DOI: 10.1109/NMDC50713.2021.9677519
Jayapriya U S, S. Goel
3D printing is a facile processing technique applied towards developing bioelectrodes for electrochemical energy applications as well. However, 3DP is yet to be explored to fabricate non-enzymatic biofuel cells (NEBFC). In this work, a novel non-enzymatic 3DP anode has been fabricated by using gold nanoparticles as catalyst and MXene as support material to enhance the electron efficacy. The catalyst and support were electrodeposited on the 3DPG electrode using optimal parameters. The 3DPG/MXene/Au anode for NEBFC was successfully studied by electrochemical characterization for efficient biocatalysis of glucose producing a power density of $18.2 mu mathrm{W}/text{cm}^{2}$. The results show that the MXene support and gold catalyst enhanced the performance two-fold than anode with only metallic catalyst. These electrodes pave way for development of simple and functional anode for various electrochemical applications.
3D打印是一种简单的加工技术，可用于开发电化学能源应用的生物电极。然而，3d打印技术尚未被用于制造非酶生物燃料电池(NEBFC)。本文以金纳米颗粒为催化剂，MXene为支撑材料，制备了一种新型的非酶促3DP阳极，以提高电子效率。采用最佳工艺参数将催化剂和载体电沉积在3DPG电极上。通过电化学表征，成功地研究了用于NEBFC的3DPG/MXene/Au阳极高效生物催化葡萄糖的功率密度为18.2 mu mathm {W}/text{cm}^{2}$。结果表明，MXene载体和金催化剂比阳极只使用金属催化剂提高了两倍的性能。这些电极为开发用于各种电化学应用的简单功能阳极铺平了道路。
{"title":"High performance MXene supported Gold Nanoparticles-based 3D Printed Anode for Non-Enzymatic Biofuel Cell","authors":"Jayapriya U S, S. Goel","doi":"10.1109/NMDC50713.2021.9677519","DOIUrl":"https://doi.org/10.1109/NMDC50713.2021.9677519","url":null,"abstract":"3D printing is a facile processing technique applied towards developing bioelectrodes for electrochemical energy applications as well. However, 3DP is yet to be explored to fabricate non-enzymatic biofuel cells (NEBFC). In this work, a novel non-enzymatic 3DP anode has been fabricated by using gold nanoparticles as catalyst and MXene as support material to enhance the electron efficacy. The catalyst and support were electrodeposited on the 3DPG electrode using optimal parameters. The 3DPG/MXene/Au anode for NEBFC was successfully studied by electrochemical characterization for efficient biocatalysis of glucose producing a power density of $18.2 mu mathrm{W}/text{cm}^{2}$. The results show that the MXene support and gold catalyst enhanced the performance two-fold than anode with only metallic catalyst. These electrodes pave way for development of simple and functional anode for various electrochemical applications.","PeriodicalId":6742,"journal":{"name":"2021 IEEE 16th Nanotechnology Materials and Devices Conference (NMDC)","volume":"98 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91473939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-12DOI: 10.1109/NMDC50713.2021.9677547
Murali Duggina, N. Jackson
Flexible polymer based piezoelectric materials are being extensively investigated, but their role in microelectromechanical systems (MEMS) is still limited due primarily to their low temperature capabilities. This paper focuses on converting a widely used MEMS polymer (Parylene-C) into a piezoelectric film. The paper investigates how crystallinity of the film effects the piezoelectric properties along with varying the poling method and properties. The results demonstrate that through electric poling Parylene-C can generate piezoelectric properties and that annealing the samples significantly enhances the piezoelectric properties. We were able to achieve relatively high d33 values of 5.4 pC/N when annealed at 150°C. We demonstrated that both poling methods and the properties of the poling such as temperature and applied voltage influence the properties and needs to be further investigated.
{"title":"Converting Parylene C into a Thin Film Piezoelectric Material","authors":"Murali Duggina, N. Jackson","doi":"10.1109/NMDC50713.2021.9677547","DOIUrl":"https://doi.org/10.1109/NMDC50713.2021.9677547","url":null,"abstract":"Flexible polymer based piezoelectric materials are being extensively investigated, but their role in microelectromechanical systems (MEMS) is still limited due primarily to their low temperature capabilities. This paper focuses on converting a widely used MEMS polymer (Parylene-C) into a piezoelectric film. The paper investigates how crystallinity of the film effects the piezoelectric properties along with varying the poling method and properties. The results demonstrate that through electric poling Parylene-C can generate piezoelectric properties and that annealing the samples significantly enhances the piezoelectric properties. We were able to achieve relatively high d33 values of 5.4 pC/N when annealed at 150°C. We demonstrated that both poling methods and the properties of the poling such as temperature and applied voltage influence the properties and needs to be further investigated.","PeriodicalId":6742,"journal":{"name":"2021 IEEE 16th Nanotechnology Materials and Devices Conference (NMDC)","volume":"60 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90202180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-12DOI: 10.1109/NMDC50713.2021.9677470
Neha Kondekar, Pralav P. Shetty, Lan Ho, Yi Li, Matthew P. West, M. McDowell
We report selective growth of few-layered, crystalline MoS2 on Ni thin films while inhibiting growth on Au thin films and SiO2/Si when using conventional MoS2 CVD based on MoO3 and S precursors. This allows for selective growth of crystalline MoS2 with precise spatial control and repeatability across large areas with optimal precursor delivery and is critical to large-scale manufacturing of MoS2 devices. This selective growth is postulated to be due to differences in surface energy of the Ni/Au/SiO2 surfaces. Contact angle measurements show that Ni thin films have a lower contact angle and are more hydrophilic than Au or SiO2. Previous studies have shown that low concentrations of Ni result in formation of larger grains of MoS2, aiding the growth of MoS2 on patterned Ni channels. Ongoing work explores the possibility of selectively etching the underlying Ni thin films to use these patterned Au/MoS2 thin films as FET devices.
{"title":"Preferential growth of crystalline MoS2 on patterned Ni channels in contact with Au thin films","authors":"Neha Kondekar, Pralav P. Shetty, Lan Ho, Yi Li, Matthew P. West, M. McDowell","doi":"10.1109/NMDC50713.2021.9677470","DOIUrl":"https://doi.org/10.1109/NMDC50713.2021.9677470","url":null,"abstract":"We report selective growth of few-layered, crystalline MoS<inf>2</inf> on Ni thin films while inhibiting growth on Au thin films and SiO<inf>2</inf>/Si when using conventional MoS<inf>2</inf> CVD based on MoO<inf>3</inf> and S precursors. This allows for selective growth of crystalline MoS<inf>2</inf> with precise spatial control and repeatability across large areas with optimal precursor delivery and is critical to large-scale manufacturing of MoS<inf>2</inf> devices. This selective growth is postulated to be due to differences in surface energy of the Ni/Au/SiO<inf>2</inf> surfaces. Contact angle measurements show that Ni thin films have a lower contact angle and are more hydrophilic than Au or SiO<inf>2</inf>. Previous studies have shown that low concentrations of Ni result in formation of larger grains of MoS<inf>2</inf>, aiding the growth of MoS<inf>2</inf> on patterned Ni channels. Ongoing work explores the possibility of selectively etching the underlying Ni thin films to use these patterned Au/MoS<inf>2</inf> thin films as FET devices.","PeriodicalId":6742,"journal":{"name":"2021 IEEE 16th Nanotechnology Materials and Devices Conference (NMDC)","volume":"136 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76452328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-12DOI: 10.1109/NMDC50713.2021.9677509
R. Sliz, Juho Valikangas, Pauliina Vilmi, Tao Hu, U. Lassi, T. Fabritius
The production methods of Li-ion batteries need to be adapted for the goals of a more sustainable future. This research focuses on replacing toxic NMP with less harmful solvents, without compromising the batteries' performance. In this research, the novel NCM88 material has been used to fabricate the cathode layers of Li-ion batteries. Two fabrication methods (blade coating and screen printing) and two different slurry/ink formulations (NMP- and DMF-based) have been analysed. Results indicate that screen-printed cathodes fabricated with DMF-based slurries perform similarly to those fabricated through blade-coating NMP slurries.
{"title":"Replacement of NMP solvent for more sustainable, high-capacity, printed Li-ion battery cathodes","authors":"R. Sliz, Juho Valikangas, Pauliina Vilmi, Tao Hu, U. Lassi, T. Fabritius","doi":"10.1109/NMDC50713.2021.9677509","DOIUrl":"https://doi.org/10.1109/NMDC50713.2021.9677509","url":null,"abstract":"The production methods of Li-ion batteries need to be adapted for the goals of a more sustainable future. This research focuses on replacing toxic NMP with less harmful solvents, without compromising the batteries' performance. In this research, the novel NCM88 material has been used to fabricate the cathode layers of Li-ion batteries. Two fabrication methods (blade coating and screen printing) and two different slurry/ink formulations (NMP- and DMF-based) have been analysed. Results indicate that screen-printed cathodes fabricated with DMF-based slurries perform similarly to those fabricated through blade-coating NMP slurries.","PeriodicalId":6742,"journal":{"name":"2021 IEEE 16th Nanotechnology Materials and Devices Conference (NMDC)","volume":"10 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74011269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-12DOI: 10.1109/NMDC50713.2021.9677544
Zohreh Sharifi, Michael Dobinson, G. Hajisalem, A. Frencken, F. V. van Veggel, R. Gordon
Quantum technologies require sources of single photons, which can be created by isolating individual atoms or ions. Erbium ions are a promising choice for single photon sources as it emits photons at low-loss fiber optic wavelengths. However, erbium has a low emission rate and it is challenging to isolate single emitters reliably. Here, we isolate singly Er3+-doped nanocrystals using optical tweezers in a gold double nanohole aperture. The double nanohole geometry enhances the emission rate from the nanocrystals. With this additional enhancement we observe emission at 1550 nm. Discrete levels of emission from dilutely Er3+-doped nanocrystals are observed—corresponding to the number of active erbium emitters present. Nanocrystals with single active emitters were identified and isolated with this technique, demonstrating a path towards single emitter sources at 1550 nm.
{"title":"Enhancing and Isolating Lanthanide-Doped Nanocrystals Using Double Nanohole Optical Tweezers for Quantum Light Sources at 1550 nm","authors":"Zohreh Sharifi, Michael Dobinson, G. Hajisalem, A. Frencken, F. V. van Veggel, R. Gordon","doi":"10.1109/NMDC50713.2021.9677544","DOIUrl":"https://doi.org/10.1109/NMDC50713.2021.9677544","url":null,"abstract":"Quantum technologies require sources of single photons, which can be created by isolating individual atoms or ions. Erbium ions are a promising choice for single photon sources as it emits photons at low-loss fiber optic wavelengths. However, erbium has a low emission rate and it is challenging to isolate single emitters reliably. Here, we isolate singly Er3+-doped nanocrystals using optical tweezers in a gold double nanohole aperture. The double nanohole geometry enhances the emission rate from the nanocrystals. With this additional enhancement we observe emission at 1550 nm. Discrete levels of emission from dilutely Er3+-doped nanocrystals are observed—corresponding to the number of active erbium emitters present. Nanocrystals with single active emitters were identified and isolated with this technique, demonstrating a path towards single emitter sources at 1550 nm.","PeriodicalId":6742,"journal":{"name":"2021 IEEE 16th Nanotechnology Materials and Devices Conference (NMDC)","volume":"105 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74808275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-12DOI: 10.1109/NMDC50713.2021.9677502
Shahad Albawardi, Saeed Alghamdi, Faisal Alamri, Sarah Alsaggaf, G. Aljalham, Majed Alharbi, Haya Aljoudi, Olaiyan Alolaiyan, Moh. R. Amer
2-Dimensional (2D) materials are emerging new materials with promising future. Yet, as the demand for 2D large-scale applications increases, major nanofabrication challenges arise which could hinder the implementation of 2D materials for device applications. Liquid-phase exfoliation is a promising route to integrate nanomaterials into large-scale applications. This method has been recently reported by some groups as an inexpensive and facile method to yield high quality few-layer materials. In particular, thin films produced from drop casting/Ink-jet printing of 2D-materials on silicon substrate typically yields non-uniform distribution of nanoparticles, which is significantly attributed to the “Coffee Ring Effect”, which led to introducing additives and surfactants to 2D ink solutions and potentially altering the pristine nature of the fabricated thin film. In this work, we apply liquid phase exfoliation technique on WSe2 powder through suspension in 1:1 Water/Ethanol mixture. We show an induced suppression of the Coffee-ring transport mechanism by controlling evaporation of the solution droplet, which has led to homogenous and continuous thin films. We apply our method to create WSe2/n-type Si photovoltaic devices and characterize the photovoltaic properties under 532nm laser irradiation. Our results shed some light on low-cost fabrication processes of 2D thin films for large-scale electronic and photonic applications.
{"title":"Low-Cost, Homogeneous, and Continuous Thin Film of 2D Semiconductors: Towards Large Scale Electronic and Photonic Devices","authors":"Shahad Albawardi, Saeed Alghamdi, Faisal Alamri, Sarah Alsaggaf, G. Aljalham, Majed Alharbi, Haya Aljoudi, Olaiyan Alolaiyan, Moh. R. Amer","doi":"10.1109/NMDC50713.2021.9677502","DOIUrl":"https://doi.org/10.1109/NMDC50713.2021.9677502","url":null,"abstract":"2-Dimensional (2D) materials are emerging new materials with promising future. Yet, as the demand for 2D large-scale applications increases, major nanofabrication challenges arise which could hinder the implementation of 2D materials for device applications. Liquid-phase exfoliation is a promising route to integrate nanomaterials into large-scale applications. This method has been recently reported by some groups as an inexpensive and facile method to yield high quality few-layer materials. In particular, thin films produced from drop casting/Ink-jet printing of 2D-materials on silicon substrate typically yields non-uniform distribution of nanoparticles, which is significantly attributed to the “Coffee Ring Effect”, which led to introducing additives and surfactants to 2D ink solutions and potentially altering the pristine nature of the fabricated thin film. In this work, we apply liquid phase exfoliation technique on WSe2 powder through suspension in 1:1 Water/Ethanol mixture. We show an induced suppression of the Coffee-ring transport mechanism by controlling evaporation of the solution droplet, which has led to homogenous and continuous thin films. We apply our method to create WSe2/n-type Si photovoltaic devices and characterize the photovoltaic properties under 532nm laser irradiation. Our results shed some light on low-cost fabrication processes of 2D thin films for large-scale electronic and photonic applications.","PeriodicalId":6742,"journal":{"name":"2021 IEEE 16th Nanotechnology Materials and Devices Conference (NMDC)","volume":"111 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79208827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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