James Bullock

21.3%-efficient n-type silicon solar cell with a full area rear TiOx/LiF/Al electron-selective contact

W Wang, J He, D Yan, C Samundsett, SP Phang, Z Huang, W Shen, J Bullock, Y Wan

Journal article  |  2020  |  Solar Energy Materials and Solar Cells

In this work, we investigate an efficient electron-selective passivating contact with TiOx/LiF/Al contact structure, which offers ..

Passivating contacts for crystalline silicon solar cells

TG Allen, J Bullock, X Yang, A Javey, S De Wolf

Journal article  |  2019  |  Nature Energy

The global photovoltaic (PV) market is dominated by crystalline silicon (c-Si) based technologies with heavily doped, directly met..

Machine Learning Optimization of p-Type Transparent Conducting Films

Lingfei Wei, Xiaojie Xu, undefined Gurudayal, James Bullock, Joel W Ager

Journal article  |  2019  |  Chemistry of Materials

p-Type transparent conducting materials (p-TCMs) are important components of optoelectronic devices including solar cells, photode..

Optical and electrical properties of two-dimensional palladium diselenide

G Zhang, M Amani, A Chaturvedi, C Tan, J Bullock, X Song, H Kim, DH Lien, MC Scott, H Zhang, A Javey

Journal article  |  2019  |  Applied Physics Letters

© 2019 Author(s). Two-dimensional (2D) noble-metal dichalcogenides exhibit exceptionally strong thickness-dependent bandgaps, whic..

15% Efficiency Ultrathin Silicon Solar Cells with Fluorine-Doped Titanium Oxide and Chemically Tailored Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfo nate) as Asymmetric Heterocontact

Jian He, Md Anower Hossain, Hao Lin, Wenjie Wang, Siva Krishna Karuturi, Bram Hoex, Jichun Ye, Pingqi Gao, James Bullock, Yimao Wan

Journal article  |  2019  |  ACS Nano

In Situ Transmission Electron Microscopy Study of Molybdenum Oxide Contacts for Silicon Solar Cells

H Ali, S Koul, G Gregory, J Bullock, A Javey, A Kushima, KO Davis

Journal article  |  2019  |  physica status solidi (a)

In this study, a molybdenum oxide (MoO x ) and aluminum (Al) contact structure for crystalline silicon (c-Si) solar cells is inves..

Dopant-Free Partial Rear Contacts Enabling 23% Silicon Solar Cells

James Bullock, Yimao Wan, Mark Hettick, Zhaoran Xu, Sieu Pheng Phang, Di Yan, Hanchen Wang, Wenbo Ji, Chris Samundsett, Ziv Hameiri, Daniel Macdonald, Andres Cuevas, Ali Javey

Journal article  |  2019  |  Advanced Energy Materials

Si photocathode with Ag-supported dendritic Cu catalyst for CO2 reduction

undefined Gurudayal, Jeffrey W Beeman, James Bullock, Hao Wang, Johanna Eichhorn, Clarissa Towle, Ali Javey, Francesca M Toma, Nripan Mathews, Joel W Ager

Journal article  |  2019  |  Energy & Environmental Science

Solar-driven photocathode converts carbon dioxide to C2and C3products.

Dip Coating Passivation of Crystalline Silicon by Lewis Acids

Wenbo Ji, Yingbo Zhao, Hossain M Fahad, James Bullock, Thomas Allen, Der-Hsien Lien, Stefaan De Wolf, Ali Javey

Journal article  |  2019  |  ACS Nano

Mid-infrared computational spectroscopy with an electrically-tunable graphene metasurface

VR Shrestha, B Craig, M Amani, J Bullock, A Javey, KB Crozier

Conference Proceedings  |  2019  |  Conference on Lasers and Electro-Optics

© 2019 The Author(s) We demonstrate graphene-plasmonic metasurfaces whose mid-infrared reflection spectra are electrically-tunable..

Polarization-resolved black phosphorus/molybdenum disulfide mid-wave infrared photodiodes with high detectivity at room temperature

James Bullock, Matin Amani, Joy Cho, Yu-Ze Chen, Geun Ho Ahn, Valerio Adinolfi, Vivek Raj Shrestha, Yang Gao, Kenneth B Crozier, Yu-Lun Chueh, Ali Javey

Journal article  |  2018  |  Nature Photonics

Carrier population control and surface passivation in solar cells

Andres Cuevas, Yimao Wan, Di Yan, Christian Samundsett, Thomas Allen, Xinyu Zhang, Jie Cui, James Bullock

Journal article  |  2018  |  Solar Energy Materials and Solar Cells

Thermal Stability of Hole-Selective Tungsten Oxide: In Situ Transmission Electron Microscopy Study

Haider Ali, Supriya Koul, Geoffrey Gregory, James Bullock, Ali Javey, Akihiro Kushima, Kristopher O Davis

Journal article  |  2018  |  Scientific Reports

Temperature and Humidity Stable Alkali/Alkaline-Earth Metal Carbonates as Electron Heterocontacts for Silicon Photovoltaics

Yimao Wan, James Bullock, Mark Hettick, Zhaoran Xu, Chris Samundsett, Di Yan, Jun Peng, Jichun Ye, Ali Javey, Andres Cuevas

Journal article  |  2018  |  Advanced Energy Materials

Solution-Synthesized High-Mobility Tellurium Nanoflakes for Short-Wave Infrared Photodetectors

Matin Amani, Chaoliang Tan, George Zhang, Chunsong Zhao, James Bullock, Xiaohui Song, Hyungjin Kim, Vivek Raj Shrestha, Yang Gao, Kenneth B Crozier, Mary Scott, Ali Javey

Journal article  |  2018  |  ACS Nano

Zirconium oxide surface passivation of crystalline silicon

Yimao Wan, James Bullock, Mark Hettick, Zhaoran Xu, Di Yan, Jun Peng, Ali Javey, Andres Cuevas

Journal article  |  2018  |  Applied Physics Letters

A Wearable Microfluidic Sensing Patch for Dynamic Sweat Secretion Analysis

Hnin Yin Yin Nyein, Li-Chia Tai, Phuong Ngo Quynh, Minghan Chao, George B Zhang, Wei Gao, Mallika Bariya, James Bullock, Hyungjin Kim, Hossain M Fahad, Ali Javey

Journal article  |  2018  |  ACS Sensors

Stable Dopant-Free Asymmetric Heterocontact Silicon Solar Cells with Efficiencies above 20%

James Bullock, Yimao Wan, Zhaoran Xu, Stephanie Essig, Mark Hettick, Hanchen Wang, Wenbo Ji, Mathieu Boccard, Andres Cuevas, Christophe Ballif, Ali Javey

Journal article  |  2018  |  ACS Energy Letters

Solution-Processed Transparent Self-Powered p-CuS-ZnS/n-ZnO UV Photodiode

Xiaojie Xu, Sudhanshu Shukla, Ya Liu, Binbin Yue, James Bullock, Longxing Su, Yanmei Li, Ali Javey, Xiaosheng Fang, Joel W Ager

Journal article  |  2018  |  physica status solidi (RRL) - Rapid Research Letters

Transmission Electron Microscopy Studies of Transition Metal Oxides Employed as Carrier Selective Contacts in Silicon Solar Cells

Haider Ali, James Bullock, Geoffrey Gregory, Xinbo Yang, Matthew Schneider, Klaus Weber, Ali Javey, Kristopher O Davis

Conference Proceedings  |  2018  |  Proceedings of the 2018 7th IEEE World Conference on Photovoltaic Energy Conversion (WCPEC) / A Joint Conference of 45th IEEE PVSC / 28th PVSEC / 34th EU PVSEC

23% efficient n-type crystalline silicon solar cells with passivated partial rear contacts

James Bullock, Yimao Wan, Zhaoran Xu, Yan Di, Phang Pheng, Mark Hettick, Chris Samundsett, Ziv Hameiri, Andres Cuevas, Ali Javey

Conference Proceedings  |  2018  |  2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)

Electrical tuning of reflectance of graphene metasurface for unpolarized long wavelength infrared light

VR Shrestha, Y Gao, M Amani, J Bullock, A Javey, KB Crozier

Conference Proceedings  |  2018  |  Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF)

Tantalum Oxide Electron-Selective Heterocontacts for Silicon Photovoltaics and Photoelectrochemical Water Reduction

Yimao Wan, Siva Krishna Karuturi, Christian Samundsett, James Bullock, Mark Hettick, Di Yan, Jun Peng, Parvathala Reddy Narangari, Sudha Mokkapati, Hark Hoe Tan, Chennupati Jagadish, Ali Javey, Andres Cuevas

Journal article  |  2018  |  ACS Energy Letters

Superacid-Treated Silicon Surfaces: Extending the Limit of Carrier Lifetime for Photovoltaic Applications

Nicholas E Grant, Tim Niewelt, Neil R Wilson, Evangeline C Wheeler-Jones, James Bullock, Mohammad Al-Amin, Martin C Schubert, Andre C van Veen, Ali Javey, John D Murphy

Journal article  |  2017  |  IEEE Journal of Photovoltaics

Mid-Wave Infrared Photoconductors Based on Black Phosphorus-Arsenic Alloys

Matin Amani, Emma Regan, James Bullock, Geun Ho Ahn, Ali Javey

Journal article  |  2017  |  ACS Nano

Efficient solar-driven electrochemical CO2 reduction to hydrocarbons and oxygenates

undefined Gurudayal, James Bullock, David F Sranko, Clarissa M Towle, Yanwei Lum, Mark Hettick, MC Scott, Ali Javey, Joel Ager

Journal article  |  2017  |  Energy & Environmental Science

Microchannel contacting of crystalline silicon solar cells

James Bullock, Hiroki Ota, Hanchen Wang, Zhaoran Xu, Mark Hettick, Di Yan, Christian Samundsett, Yimao Wan, Stephanie Essig, Monica Morales-Masis, Andres Cuevas, Ali Javey

Journal article  |  2017  |  Scientific Reports

Calcium contacts to n-type crystalline silicon solar cells

Thomas G Allen, James Bullock, Peiting Zheng, Ben Vaughan, Matthew Barr, Yimao Wan, Christian Samundsett, Daniel Walter, Ali Javey, Andres Cuevas

Journal article  |  2017  |  Progress in Photovoltaics: Research and Applications

A Low Resistance Calcium/Reduced Titania Passivated Contact for High Efficiency Crystalline Silicon Solar Cells

Thomas G Allen, James Bullock, Quentin Jeangros, Christian Samundsett, Yimao Wan, Jie Cui, Aicha Hessler-Wyser, Stefaan De Wolf, Ali Javey, Andres Cuevas

Journal article  |  2017  |  Advanced Energy Materials

Conductive and Stable Magnesium Oxide Electron-Selective Contacts for Efficient Silicon Solar Cells

Yimao Wan, Chris Samundsett, James Bullock, Mark Hettick, Thomas Allen, Di Yan, Jun Peng, Yiliang Wu, Jie Cui, Ali Javey, Andres Cuevas

Journal article  |  2017  |  Advanced Energy Materials

Characterisation of sputtering deposited amorphous silicon films for silicon heterojunction solar cells

X Zhang, A Cuevas, J Bullock

Conference Proceedings  |  2017  |  2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)

Low resistance TiO 2 -passivated calcium contacts to for crystalline silicon solar cells

TG Allen, P Zheng, B Vaughan, M Barr, Y Wan, C Samundsett, J Bullock, A Cuevas

Conference Proceedings  |  2017  |  2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)

Magnesium fluoride based electron-selective contact

Y Wan, C Samundsett, J Bullock, D Yan, T Allen, P Zheng, X Zhang, J Cui, J McKeon, A Cuevas

Conference Proceedings  |  2017  |  2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)

Survey of dopant-free carrier-selective contacts for silicon solar cells

J Bullock, Y Wan, M Hettick, J Geissbuhler, AJ Ong, D Kiriya, D Yan, T Allen, J Peng, X Zhang, CM Sutter-Fella, S De Wolf, C Ballif, A Cuevas, A Javey

Conference Proceedings  |  2017  |  2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)

Superacid Passivation of Crystalline Silicon Surfaces

James Bullock, Daisuke Kiriya, Nicholas Gran, Angelica Azcatl, Mark Hettick, Teng Kho, Pheng Pheng, Hang C Sio, Di Yan, Daniel Macdonald, Manuel A Quevedo-Lopez, Robert M Wallace, Andres Cuevas, Ali Javey

Journal article  |  2016  |  ACS Applied Materials & Interfaces

A magnesium/amorphous silicon passivating contact for n-type crystalline silicon solar cells

Yimao Wan, Chris Samundsett, Di Yan, Thomas Allen, Jun Peng, Jie Cui, Xinyu Zhang, James Bullock, Andres Cuevas

Journal article  |  2016  |  Applied Physics Letters

Low resistance Ohmic contact to p-type crystalline silicon via nitrogen-doped copper oxide films

Xinyu Zhang, Yimao Wan, James Bullock, Thomas Allen, Andres Cuevas

Journal article  |  2016  |  Applied Physics Letters

Passivating contacts for silicon solar cells based on boron-diffused recrystallized amorphous silicon and thin dielectric interlayers

Di Yan, Andres Cuevas, Yimao Wan, James Bullock

Journal article  |  2016  |  Solar Energy Materials and Solar Cells

Lithium Fluoride Based Electron Contacts for High Efficiency n-Type Crystalline Silicon Solar Cells

James Bullock, Peiting Zheng, Quentin Jeangros, Mahmut Tosun, Mark Hettick, Carolin M Sutter-Fella, Yimao Wan, Thomas Allen, Di Yan, Daniel Macdonald, Stefaan De Wolf, Aicha Hessler-Wyser, Andres Cuevas, Ali Javey

Journal article  |  2016  |  Advanced Energy Materials

Wearable Microsensor Array for Multiplexed Heavy Metal Monitoring of Body Fluids

Wei Gao, Hnin YY Nyein, Ziba Shahpar, Hossain M Fahad, Kevin Chen, Sam Emaminejad, Yuji Gao, Li-Chia Tai, Hiroki Ota, Eric Wu, James Bullock, Yuping Zeng, Der-Hsien Lien, Ali Javey

Journal article  |  2016  |  ACS Sensors

Magnesium Fluoride Electron-Selective Contacts for Crystalline Silicon Solar Cells

Yimao Wan, Chris Samundsett, James Bullock, Thomas Allen, Mark Hettick, Di Yan, Peiting Zheng, Xinyu Zhang, Jie Cui, Josephine McKeon, Ali Javey, Andres Cuevas

Journal article  |  2016  |  ACS Applied Materials & Interfaces

Chemical Bath Deposition of p-Type Transparent, Highly Conducting (CuS)(x):(ZnS)(1-x) Nanocomposite Thin Films and Fabrication of Si Heterojunction Solar Cells

Xiaojie Xu, James Bullock, Laura T Schelhas, Elias Z Stutz, Jose J Fonseca, Mark Hettick, Vanessa L Pool, Kong Fai Tai, Michael F Toney, Xiaosheng Fang, Ali Javey, Lydia Helena Wong, Joel W Ager

Journal article  |  2016  |  Nano Letters

Efficient silicon solar cells with dopant-free asymmetric heterocontacts

James Bullock, Mark Hettick, Jonas Geissbuhler, Alison J Ong, Thomas Allen, Carolin M Sutter-Fella, Teresa Chen, Hiroki Ota, Ethan W Schaler, Stefaan De Wolf, Christophe Ballif, Andres Cuevas, Ali Javey

Journal article  |  2016  |  Nature Energy

Magnesium Fluoride Based Electron-Selective Contact

Yimao Wan, Chris Samundsett, James Bullock, Di Yan, Thomas Allen, Peiting Zheng, Xinyu Zhang, Jie Cui, Josephine McKeon, Andres Cuevas

Conference Proceedings  |  2016  |  2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

Characterisation of sputtering deposited amorphous silicon films for silicon heterojunction solar cells

Xinyu Zhang, Andres Cuevas, James Bullock

Conference Proceedings  |  2016  |  2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

Low resistance TiO2-passivated calcium contacts to for crystalline silicon solar cells

Thomas G Allen, Peiting Zheng, Ben Vaughan, Matthew Barr, Yimao Wan, Christian Samundsett, James Bullock, Andres Cuevas

Conference Proceedings  |  2016  |  2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

Survey of Dopant-Free Carrier-Selective Contacts for Silicon Solar Cells

James Bullock, Yimao Wan, Mark Hettick, Jonas Geissbuhler, Alison J Ong, Daisuke Kiriya, Di Yan, Thomas Allen, Jun Peng, Xinyu Zhang, Carolin M Sutter-Fella, Stefaan De Wolf, Christophe Ballif, Andres Cuevas, Ali Javey

Conference Proceedings  |  2016  |  2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

Passivation of c-Si surfaces by sub-nm amorphous silicon capped with silicon nitride

Yimao Wan, Di Yan, James Bullock, Xinyu Zhang, Andres Cuevas

Journal article  |  2015  |  Applied Physics Letters

Passivation of c-Si surfaces by ALD tantalum oxide capped with PECVD silicon nitride

Yimao Wan, James Bullock, Andres Cuevas

Journal article  |  2015  |  Solar Energy Materials and Solar Cells

Proof-of-Concept p-Type Silicon Solar Cells With Molybdenum Oxide Local Rear Contacts

James Bullock, Christian Samundsett, Andres Cuevas, Di Yan, Yimao Wan, Thomas Allen

Journal article  |  2015  |  IEEE Journal of Photovoltaics

Silicon nitride/silicon oxide interlayers for solar cell passivating contacts based on PECVD amorphous silicon

Di Yan, Andres Cuevas, Yimao Wan, James Bullock

Journal article  |  2015  |  physica status solidi (RRL) - Rapid Research Letters

Phosphorus-diffused polysilicon contacts for solar cells

Di Yan, Andres Cuevas, James Bullock, Yimao Wan, Christian Samundsett

Journal article  |  2015  |  Solar Energy Materials and Solar Cells

Passivated contacts to laser doped p( ) and n( ) regions

Xinbo Yang, James Bullock, Lujia Xu, Qunyu Bi, Sachin Surve, Sachin Surve, Marco Ernst, Klaus Weber

Journal article  |  2015  |  Solar Energy Materials and Solar Cells

Contact Resistivity of Evaporated Al Contacts for Silicon Solar Cells

Kean Chern Fong, Teng Choon Kho, Andreas Fell, Evan Franklin, Ngwe Zin, Andrew W Blakers, Keith R McIntosh, Thomas Ratcliff, Matthew Stocks, James Bullock, Er-Chien Wang

Journal article  |  2015  |  IEEE Journal of Photovoltaics

Humidity degradation and repair of ALD Al2O3 passivated silicon

W Liang, KJ Weber, D Suh, J Yu, J Bullock

Conference Proceedings  |  2015  |  2013 IEEE 39th Photovoltaic Specialists Conference (PVSC) PART 2

Simple silicon solar cells featuring an a-Si:H enhanced rear MIS contact

James Bullock, Andres Cuevas, Christian Samundsett, Di Yan, Josephine McKeon, Yimao Wan

Journal article  |  2015  |  Solar Energy Materials and Solar Cells

Tantalum oxide/silicon nitride: A negatively charged surface passivation stack for silicon solar cells

Yimao Wan, James Bullock, Andres Cuevas

Journal article  |  2015  |  Applied Physics Letters

High efficiency n-type silicon solar cells featuring passivated contact to laser doped regions

Xinbo Yang, James Bullock, Qunyu Bi, Klaus Weber

Journal article  |  2015  |  Applied Physics Letters

Nanoporous Silicon Produced by Metal-Assisted Etching: A Detailed Investigation of Optical and Contact Properties for Solar Cells

TK Chong, J Bullock, TP White, M Berry, KJ Weber

Journal article  |  2015  |  IEEE Journal of Photovoltaics

Grown-in defects limiting the bulk lifetime of p-type float-zone silicon wafers

NE Grant, FE Rougieux, D Macdonald, J Bullock, Y Wan

Journal article  |  2015  |  Journal of Applied Physics

Degradation of the surface passivation of plasma-assisted ALD Al2O3 under damp-heat exposure

Wensheng Liang, Dongchul Suh, Jun Yu, James Bullock, Klaus J Weber

Journal article  |  2015  |  physica status solidi (a)

Proof-of-concept p-type silicon solar cells with molybdenum oxide partial rear contacts

James Bullock, Christian Samundsett, Andres Cuevas, Di Yan, Yimao Wan, Thomas Allen

Conference Proceedings  |  2015  |  2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC)

n- and p-type silicon solar cells with molybdenum oxide hole contacts

James Bullock, Di Yan, Andres Cuevas, Yimao Wan, Christian Samundsett

Conference Proceedings  |  2015  |  Energy Procedia

Skin Care for Healthy Silicon Solar Cells

Andres Cuevas, Thomas Allen, James Bullock, Yimao Wan, Di Van, Xinyu Zhang

Conference Proceedings  |  2015  |  2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC)

Molybdenum oxide MoOx: A versatile hole contact for silicon solar cells

James Bullock, Andres Cuevas, Thomas Allen, Corsin Battaglia

Journal article  |  2014  |  Applied Physics Letters

Amorphous silicon enhanced metal-insulator-semiconductor contacts for silicon solar cells

J Bullock, A Cuevas, D Yan, B Demaurex, A Hessler-Wyser, S De Wolf

Journal article  |  2014  |  Journal of Applied Physics

Amorphous silicon passivated contacts for diffused junction silicon solar cells

J Bullock, D Yan, Y Wan, A Cuevas, B Demaurex, A Hessler-Wyser, S De Wolf

Journal article  |  2014  |  Journal of Applied Physics

Damp and dry heat degradation of thermal oxide passivation of p( ) silicon

Andrew Thomson, Matthew Gardner, Keith McIntosh, Avi Shalav, James Bullock

Journal article  |  2014  |  Journal of Applied Physics

Development of a Self-aligned Etch-back Process for Selectively Doped Silicon Solar Cells

Di Yan, Andres Cuevas, James Bullock, Yimao Wan

Conference Proceedings  |  2014  |  2014 IEEE 40th Photovoltaic Specialist Conference (PVSC)

Reactive Ion Etched Black Silicon Texturing: A Comparative Study

Thomas Allen, James Bullock, Andres Cuevas, Simeon Baker-Finch, Fouad Karouta

Conference Proceedings  |  2014  |  2014 IEEE 40th Photovoltaic Specialist Conference (PVSC)

Passivated Contacts to n( ) and p( ) Silicon Based on Amorphous Silicon and Thin Dielectrics

James Bullock, Di Yan, Andres Cuevas, Benedicte Demaurex, Aicha Hessler-Wyser, Stefaan De Wolf

Conference Proceedings  |  2014  |  2014 IEEE 40th Photovoltaic Specialist Conference (PVSC)

Passivation of aluminium-n( ) silicon contacts for solar cells by ultrathin Al2O3 and SiO2 dielectric layers

James Bullock, Di Yan, Andres Cuevas

Journal article  |  2013  |  physica status solidi (RRL) - Rapid Research Letters

Enhanced rear-side reflection and firing-stable surface passivation of silicon solar cells with capping polymer films

James Bullock, Andrew Thomson, Andres Cuevas, Boris Veith, Jan Schmidt, Ari Karkkainen

Journal article  |  2013  |  physica status solidi (RRL) - Rapid Research Letters

The Mechanical and Photochemical Properties of Titania Coated Silica Nanowires

Avi Shalav, James Bullock, Peter Anderson, Simon Ruffell, John White, Robert G Elliman

Journal article  |  2012  |  ECS Journal of Solid State Science and Technology