James Bullock

Long-Wave Infrared Photodetectors Based on 2D Platinum Diselenide atop Optical Cavity Substrates

Nima Sefidmooye Azar, James Bullock, Vivek Raj Shrestha, Sivacarendran Balendhran, Wei Yan, Hyungjin Kim, Ali Javey, Kenneth B Crozier

Journal article  |  2021  |  ACS NANO

Long-wave infrared (LWIR) photodetection is of high technological importance, having a wide range of applications that include the..

Light-Matter Interaction Enhancement in Anisotropic 2D Black Phosphorus via Polarization-Tailoring Nano-Optics

Nima Sefidmooye Azar, James Bullock, Sivacarendran Balendhran, Hyungjin Kim, Ali Javey, Kenneth B Crozier

Journal article  |  2021  |  ACS PHOTONICS

Black phosphorus (bP), a two-dimensional (2D) layered material, has shown great potential for infrared (IR) optoelectronics owing ..

Polysilicon passivated junctions: The next technology for silicon solar cells?

Di Yan, Andres Cuevas, Jesus Ibarra Michel, Chun Zhang, Yimao Wan, Xinyu Zhang, James Bullock

Journal article  |  2021  |  JOULE

Despite the maturity of crystalline silicon photovoltaics (c-Si PV), the last 6 years have seen a string of efficiency improvement..

Spectrally Selective Mid-Wave Infrared Detection Using Fabry-Pérot Cavity Enhanced Black Phosphorus 2D Photodiodes.

Wei Yan, Vivek Raj Shresha, Quentin Jeangros, Nima Sefidmooye Azar, Sivacarendran Balendhran, Christophe Ballif, Kenneth Crozier, James Bullock

Journal article  |  2020  |  ACS Nano

Thin two-dimensional (2D) material absorbers have the potential to reduce volume-dependent thermal noise in infrared detectors. Ho..

Visible to Long-Wave Infrared Photodetectors based on Copper Tetracyanoquinodimethane (CuTCNQ) Crystals

S Balendhran, Z Hussain, VR Shrestha, J Cadusch, M Ye, H Kim, R Ramanathan, J Bullock, A Javey, V Bansal, KB Crozier

Conference Proceedings  |  2020  |  2020 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2020 - Proceedings

We demonstrate room-temperature photodetectors at wavelengths from visible (450 nm, 532 nm) to near- (850 nm), short-wave (1550 nm..

Mid- to long-wave infrared computational spectroscopy with a graphene metasurface modulator.

Vivek Raj Shrestha, Benjamin Craig, Jiajun Meng, James Bullock, Ali Javey, Kenneth B Crozier

Journal article  |  2020  |  Scientific Reports

In recent years there has been much interest concerning the development of modulators in the mid- to long-wave infrared, based on ..

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 ..

Long -Wave In a ed Photodetectors Based on Platinum Diselenide

Nima Sefidmooye Azar, Vivek Raj Shrestha, James Bullock, Matin Amani, Hyungjin Kim, Ali Javey, Kenneth B Crozier

Conference Proceedings  |  2020  |  2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR)

We demonstrate long wave infrared photodetectors based on the transition metal dichalcogenide platinum diselenide (PtSe2) in its b..

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..