Article
Chemistry, Physical
Byungjo Kim, Muyoung Kim, Suyoung Yoo, Sang Ki Nam
Summary: This study provides atomistic insights on hydrogen plasma treatment (HPT) to improve the quality of high-k metal-oxide/silicon interfaces through a computational approach. The study identifies a physical correlation between processing parameters and interface quality, offering guidance for process optimization and the development of advanced equipment.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Namitha Dsouza, Ashish K. Singh, Rajesh Maurya, Rajesh Kanakala, Ramakrishna Madaka, Narendra Bandaru, Md. Seraj Uddin, Jatindra K. Rath
Summary: c-Si based carrier selective contact solar cells achieve high efficiency through silicon surface passivation. Atomic layer deposition (ALD) is used to deposit ultrathin Al2O3 passivation layers, known for their conformance and homogeneity. In this study, thermal ALD is used to deposit Al2O3 films on n-type CZ Si wafers, and post-deposition annealing in forming gas environments improves the passivation quality. The results demonstrate that the passivation obtained here is of device quality for CZ Si wafers and facilitates the development of high-efficiency Si heterojunction (SHJ) solar cells.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Review
Engineering, Electrical & Electronic
Sakti Prasanna Muduli, Paresh Kale
Summary: Carrier recombination at the surface and bulk is a major obstacle in improving the power conversion efficiency of first-generation solar cells. Passivation techniques, which neutralize dangling bonds or create a field effect, are employed to minimize recombination. This review discusses the evolution of cell structures based on passivation and categorizes passivation schemes based on their mechanism. There are two approaches to passivating crystalline Si: reducing minority carrier concentration at the surface or decreasing intermediate density of states. The paper compares dielectric layers for contact passivation in terms of substrate compatibility, effectiveness, interface qualities, and carrier-selective emitters, and also explores advanced hydrogen passivation techniques for bulk defects.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Proceedings Paper
Energy & Fuels
Ujjwal K. Das, Tasnim K. Mouri, Robert Theisen, Young W. Ok, Ajay Upadhyaya, Ajeet Rohatgi
Summary: Passivation of n-type and p-type textured Cz Si wafers diffused with phosphorus and boron, respectively, are achieved using gas phase H2S reaction and quinhydrone-methanol (QH-MeOH) solution. The quality of passivation strongly depends on the diffusion type and passivation method, with H2S reaction passivating n-type diffused surface as effectively as Si oxide/silicon nitride stack, and QH-MeOH passivating p-type diffused surface to the same level as aluminum oxide/silicon nitride stack.
2021 IEEE 48TH PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
(2021)
Article
Energy & Fuels
Christina Hollemann, Michael Rienacker, Anastasia Soeriyadi, Chukwuka Madumelu, Felix Haase, Jan Krugener, Brett Hallam, Rolf Brendel, Robby Peibst
Summary: The stability of the passivation quality of poly-Si on oxide junctions against high-temperature screen-print firing processes is crucial. Research indicates that thermal stress and blistering are the root causes of the increase in recombination current density and interface state density. Postfiring annealing can help improve passivation quality.
PROGRESS IN PHOTOVOLTAICS
(2022)
Article
Materials Science, Multidisciplinary
Zhanming Zhou, Hongyang Li, Ying Liu, Te Niu, Hong Li
Summary: The corrosion behavior of (FeCrCoNi)100_xTix alloy in NaCl and H2SO4 was studied. It was found that the passive corrosion current density decreases with the increase of Ti content. XPS analysis revealed that the passive film has a double-layer structure, with the outer TiO2 and inner Cr2O3 playing important roles in the corrosion resistance of the alloy.
Article
Energy & Fuels
Chaeseon Hong, Minjae Kim, Byeong-Min Lim, Sunil Moon, Keonwook Kang, Ioannis Kymissis, Hong-Sub Lee, Hyung-Ho Park
Summary: In this study, cation and anion codoped ZnO thin films were prepared through atomic layer deposition, and the effects of different anion doping concentrations on the film properties were investigated. The codoped ZnO films showed reduced oxygen vacancy due to the codoping effect. However, the electrical and optical characteristics of the films exhibited contrasting tendencies depending on the type of anion element. These differences were attributed to the correlation effects between Si doping, reduced interfacial trap density, and anion doping, oxygen vacancy passivation. The behavior of each anion also varied in terms of charge carrier concentration.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Engineering, Chemical
Lu Liu, Xiaoliu Huo, Ziduan Zhang, Rongpei Jiang, Weixiong Liu, Quan Zhu, Haisheng Ren
Summary: In this study, the effect of methanol addition on soot inhibition during n-decane pyrolysis was investigated. Experimental and simulation results both indicate that methanol addition significantly reduces the coke mass and inhibits soot formation, providing important information for soot inhibition.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Energy & Fuels
Malik Abdul Rehman, Minjae Kim, Sachin A. Pawar, Sewon Park, Naila Nasir, Dong-eun Kim, Muhammad Farooq Khan, Van Huy Nguyen, Akendra Singh Chabungbam, Yongho Seo, Takeaki Sakurai, Seung-Hyun Chun, Do Hyoung Koo, Chul-Ho Lee, Seong Chan Jun, Hyung-Ho Park
Summary: Transition metal dichalcogenide (TMDC) materials are promising candidates for 2D solar cell devices due to their easy integration, wide band gap ranges, and high absorption coefficients. In this study, a wet transfer process with thermal release tape is used to simplify the fabrication steps of 2D tungsten diselenide (WSe2) based solar cell devices. The simplified process reduces production costs and improves yield. Additionally, the use of an aluminum oxide (Al2O3) antireflective coating on the WSe2/Si junction demonstrates a significant improvement in power conversion efficiency.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Analytical
Zhihui Liu, Sahar Pishgar, Mitchell Lancaster, Stephen Maldonado
Summary: The steady-state voltammetric responses of n-type Si(100) semiconductor ultramicroelectrodes (SUMEs) immersed in air- and water-free methanolic electrolytes have been measured. The response characteristics of these SUMEs were modeled and understood through a framework that describes the distribution of the applied potential across the semiconductor/electrolyte contact. This study provides insight into the factors that dictate the observable current-potential responses and supports the tuning of Si surface reactions by exposure to dissolved outer-sphere electron acceptors.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Zhihui Liu, Sahar Pishgar, Mitchell Lancaster, Stephen Maldonado
Summary: This study measured the voltammetric responses of n-type Si(100) semiconductor ultramicroelectrodes (SUMEs) in air- and water-free methanolic electrolytes. The response characteristics of these SUMEs were understood through a framework that described the distribution of the applied potential across the semiconductor/electrolyte contact. This research provides insight into how various parameters influence the observable current-potential responses, and demonstrates the quantitative utility of voltammetry with SUMEs for measuring semiconductor/liquid contacts.
ANALYTICAL CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Hao Chen, Valery Levitas, Dmitry Popov, Nenad Velisavljevic
Summary: The unexpected nanostructure evolution during Si-I -> Si-II phase transformation is revealed by combining molecular dynamics, crystallographic theory, and in situ real-time Laue X-ray diffraction. This phase transformation results in twinned Si-II and unexpected nanobands, which form specific interfaces with Si-I and create self-accommodated nanostructure.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Ping Yang, Xiangbo Zeng
Summary: Various microstructure hydrogenated silicon was used to passivate n-type silicon nanowires and core/shell solar cells, with differences in photoluminescence spectroscopy observed between SiNWs and passivated SiNWs. The improved performance of core/shell SiNWs solar cells was attributed to reduced surface defects through intrinsic Si:H layer passivation, with a-Si:H layer passivation showing better results compared to mu c-Si:H layer, mainly due to different microstructures, especially hydrogen-terminated.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Seong Kwang Kim, Hyeong-Rak Lim, Jaejoong Jeong, Seung Woo Lee, Ho Jin Jeong, Juhyuk Park, Joon Pyo Kim, Jaeyong Jeong, Bong Ho Kim, Seung-Yeop Ahn, Youngkeun Park, Dae-Myoung Geum, Younghyun Kim, Yongku Baek, Byung Jin Cho, Sanghyeon Kim
Summary: This study reports on the fabrication and characterization of 3-D sequential complementary fieldeffect-transistors (CFETs) using the direct wafer bonding (DWB) technology and a low-temperature process for monolithic 3-D (M3D) integration. The research demonstrates the highest mobility among Ge p-FETs with similar channel thicknesses using a thin Ge (110) nanosheet (NS) channel p-FET with low effective hole mass.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Materials Science, Multidisciplinary
Yoonsok Kim, Taeyoung Kim, Wonchae Jeong, Mun Seok Jeong, Eun Kyu Kim
Summary: Researchers have achieved high performance logic inverters by using JFETs with a mixed dimensional structure. They fabricated P-type and N-type JFET devices using WSe2 and silicon materials. The characteristics of WSe2 JFETs were improved through surface polymer doping. However, there was a decline in mobility and noise characteristics due to surface scattering effects after doping.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Inorganic & Nuclear
Marco Bugnola, Roy E. Schreiber, Yehonatan Kaufman, Gregory Leitus, Linda J. W. Shimon, Ronny Neumann
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2019)
Article
Multidisciplinary Sciences
Jerry A. Fereiro, Xi Yu, Israel Pecht, Mordechai Sheves, Juan Carlos Cuevas, David Cahen
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2018)
Review
Physics, Multidisciplinary
Christopher D. Bostick, Sabyasachi Mukhopadhyay, Israel Pecht, Mordechai Sheves, David Cahen, David Lederman
REPORTS ON PROGRESS IN PHYSICS
(2018)
Article
Chemistry, Physical
Michael Kulbak, Igal Levine, Einav Barak-Kulbak, Satyajit Gupta, Arava Zohar, Isaac Balberg, Gary Hodes, David Cahen
ADVANCED ENERGY MATERIALS
(2018)
Article
Physics, Applied
Igal Levine, Satyajit Gupta, Achintya Bera, Davide Ceratti, Gary Hodes, David Cahen, Dengyang Guo, Tom J. Savenije, Jorge Avila, Henk J. Bolink, Oded Millo, Doron Azulay, Isaac Balberg
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Chemistry, Multidisciplinary
Kavita Garg, Mihir Ghosh, Tamar Eliash, Jessica H. van Wonderen, Julea N. Butt, Liang Shi, Xiuyun Jiang, Futera Zdenek, Jochen Blumberger, Israel Pecht, Mordechai Sheves, David Cahen
Article
Multidisciplinary Sciences
Byung-wook Park, Nir Kedem, Michael Kulbak, Do Yoon Lee, Woon Seok Yang, Nam Joong Jeon, Jangwon Seo, Geonhwa Kim, Ki Jeong Kim, Tae Joo Shin, Gary Hodes, David Cahen, Sang Il Seok
NATURE COMMUNICATIONS
(2018)
Article
Nanoscience & Nanotechnology
Kavita Garg, Sara Raichlin, Tatyana Bendikov, Israel Pecht, Mordechai Sheves, David Cahen
ACS APPLIED MATERIALS & INTERFACES
(2018)
Article
Chemistry, Physical
Arava Zohar, Michael Kulbak, Igal Levine, Gary Hodes, Antoine Kahn, David Cahen
ACS ENERGY LETTERS
(2019)
Review
Chemistry, Multidisciplinary
Philip Schulz, David Cahen, Antoine Kahn
Article
Chemistry, Multidisciplinary
Roy E. Schreiber, Jose M. Goicoechea
Summary: This study presents a new adduct of carbon dioxide with dihydrogenphosphide and proposes a new mechanism for the electrophilic reactivity of the phosphaethynolate ion. Functionalization with esters increases the strength of the P-C interaction, while oxygen atom functionalization stabilizes the phosphine carboxylate.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Ben Kayser, Jerry A. Fereiro, Cunlan Guo, Sidney R. Cohen, Mordechai Sheves, Israel Pecht, David Cahen
Article
Multidisciplinary Sciences
Chuanping Li, David Cahen, Ping Wang, Haijuan Li, Jie Zhang, Yongdong Jin
Article
Chemistry, Multidisciplinary
Roy E. Schreiber, Liat Avram, Ronny Neumann
CHEMISTRY-A EUROPEAN JOURNAL
(2018)
Review
Chemistry, Multidisciplinary
Ira A. Weinstock, Roy E. Schreiber, Ronny Neumann