Explanipedia

Nm-scale electrical resistance imaging on CdTe by scanning spreading resistance microscopy Open

Chun‐Sheng Jiang, Hongling Lott, Andrea Mathew, Marco Nardone, Eric Colegrove , et al. · 2025

Local resistance imaging can provide information on nm-scale carrier distribution in semiconductor devices. Scanning spreading resistance microscopy (SSRM), an atomic force microscopy-based nm-scale resistance mapping technique, has been d…

High dopant activation in arsenic doped single-crystal CdTe thin films: Insights from MBE growth and rapid thermal processing Open

Hongling Lott, Andrea Mathew, Matthew Young, Alexander Goldstone, Anthony D. Rice , et al. · 2025

Single-crystal model systems are valuable tools to investigate fundamental material properties. In this work, we use molecular beam epitaxy to deposit in situ arsenic (As) doped single-crystal CdTe films on large area Si substrates to bett…

Arsenic activation and compensation in single crystal CdTe bilayers Open

Andrea Mathew, Hongling Lott, Eric Colegrove, Matthew Young, Darius Kuciauskas , et al. · 2025

In state-of-the art polycrystalline CdTe photovoltaics, group-V dopant activation is about 2%. Low activation can create electronic defects and lead to recombination and band tail losses. To develop methods to overcome this limitation, dop…

Data for "Arsenic Activation and Compensation in Single Crystal CdTe Bilayers" Open

Andrea Mathew, Hongling Lott, Eric Colegrove, M. R. Young, Darius Kuciauskas , et al. · 2024

Grain boundary strain localization in a CdTe solar cell revealed by scanning 3D X-ray diffraction microscopy Open

Arun Shukla, Jonathan P. Wright, Anders Henningsson, Heather Stieglitz, Eric Colegrove , et al. · 2024

Scanning 3DXRD was used to visualize strain localization at grain boundaries with a high spatial resolution of 100 nm.

Distribution of Copper States, Phases, and Defects across the Depth of a Cu-Doped CdTe Solar Cell Open

Srisuda Rojsatien, Arun Mannodi‐Kanakkithodi, Trumann Walker, Niranjana Mohan Kumar, Tara Nietzold , et al. · 2023

Copper has been used as a p-type dopant in cadmium telluride (CdTe) for decades. However, the density of Cu atoms in the finished device is much higher than that of holes, which means that most Cu atoms are not activated as acceptors durin…

Why Increased CdSeTe Charge Carrier Lifetimes and Radiative Efficiencies did not Result in Voltage Boost for CdTe Solar Cells Open

Darius Kuciauskas, Marco Nardone, Alexandra Bothwell, David S. Albin, Carey Reich , et al. · 2023

After a focused effort over the last decade, order‐of‐magnitude improvements in doping and electro‐optical characteristics (radiative efficiency, carrier lifetime, and passivation) have been reported for polycrystalline CdSeTe solar cells.…

Nanometer-scale electrical potential imaging on absorber of CdSeTe solar cells Open

Chun‐Sheng Jiang, Eric Colegrove, Steven P. Harvey, Joel N. Duenow, B. Edward Sartor , et al. · 2023

Methods of growing CdTe-based materials at high rates Open

James M. Burst, David S. Albin, Eric Colegrove, Matthew O. Reese, Helio Moutinho , et al. · 2023

Systems and methods for growing high-quality CdTe-based materials at high growth rates are provided. According to an aspect of the invention, a method includes depositing a first CdTe-based layer on a CdTe-based template at a rate of great…

Controlling the stoichiometry and doping of semiconductor materials Open

David Albin, James M. Burst, Wyatt K. Metzger, Joel N. Duenow, S. Farrell , et al. · 2023

Methods for treating a semiconductor material are provided. According to an aspect of the invention, the method includes annealing the semiconductor material in the presence of a compound that includes a first element and a second element.…

Quantitative analysis of Cu XANES spectra using linear combination fitting of binary mixtures simulated by FEFF9 Open

Srisuda Rojsatien, Arun Mannodi‐Kanakkithodi, Trumann Walker, Tara Nietzold, Eric Colegrove , et al. · 2022

Investigating the Role of Copper in Arsenic Doped CdSeTe Photovoltaic Devices Open

Eric Colegrove, Matthew O. Reese, David S. Albin, Joel N. Duenow, Brian Good , et al. · 2022

As part of NREL's development of arsenic doped CdSeTe devices, co-doping with copper has become a common practice and, despite little difference in carrier concentration (often ~1016 cm-3), co-doped devices regularly show improved Voc. Giv…

Investigating the Role of Copper in Arsenic Doped Cd(Se,Te) Photovoltaics Open

Eric Colegrove, Brian Good, Ali Abbas, Helio Moutinho, Steve Johnson , et al. · 2022

Revealing the Importance of Front Interface Quality in Highly Doped CdSexTe1–x Solar Cells Open

Deborah L. McGott, Eric Colegrove, Joel N. Duenow, Colin A. Wolden, Matthew O. Reese · 2021

As carrier concentration improves in CdTe-based solar cells, modeling shows that the front interface becomes a bottleneck for performance. Optimization of the front interface has proven difficult, however, because it both is buried and evo…

The nanoscale distribution of copper and its influence on charge collection in CdTe solar cells Open

Trumann Walker, Michael Stückelberger, Tara Nietzold, Niranjana Mohan-Kumar, Christina Ossig , et al. · 2021

Exceeding 200 ns Lifetimes in Polycrystalline CdTe Solar Cells Open

Tursun Ablekim, Joel N. Duenow, Craig L. Perkins, John Moseley, Xin Zheng , et al. · 2021

CdTe photovoltaics has achieved one of the lowest levelized costs of electricity among all energy sources. However, for decades, carrier lifetimes have been inferior to those of other prevalent solar cell materials. This quality has inhibi…

3D/2D passivation as a secret to success for polycrystalline thin-film solar cells Open

Deborah L. McGott, Christopher P. Muzzillo, Craig L. Perkins, Joseph J. Berry, Kai Zhu , et al. · 2021

Copper Defects and Charge Collection in Cadmium Telluride Photovoltaic Devices Open

Trumann Walker, Tara Nietzold, Niranjana Mohan-Kumar, Michael Stückelberger, Eric Colegrove , et al. · 2021

In CdTe photovoltaic devices, the CdTe layer must be doped with Cu to reduce its resistivity, increase carrier lifetime, and improve hole transport. However, the Cu concentration is typically very low around the interfaces and within the C…

Direct Microscopy Imaging of Nonuniform Carrier Transport in Polycrystalline Cadmium Telluride Open

Chuanxiao Xiao, Chun‐Sheng Jiang, Kevin Blaine, Mahisha Amarasinghe, Eric Colegrove , et al. · 2020

Se diffusion in CdTe thin films for photovoltaics Open

Eric Colegrove, Xin Zheng, Tursun Ablekim, Joel N. Duenow, Craig L. Perkins , et al. · 2020

Manipulating CdSeTe bandgrading to enhance photocurrent and carrier lifetime is an essential part of high-performance CdTe photovoltaics (PVs). In this work, we examine Se diffusion kinetics in single-crystal and polycrystalline CdTe durin…

Roles of bandgrading, lifetime, band alignment, and carrier concentration in high-efficiency CdSeTe solar cells Open

Xin Zheng, Eric Colegrove, Joel N. Duenow, John Moseley, Wyatt K. Metzger · 2020

CdSeTe alloying has significantly increased the efficiency of CdTe-based solar technology. Here, computational modeling compares how different CdSeTe bandgrading, carrier lifetimes, band alignment, and carrier concentrations contribute to …

Optimization of source material for in-situ Arsenic doping via vapor transport deposition of CdTe films Open

Seth W. McPherson, Tawfeeq K. Al-Hamdi, Joel N. Duenow, Xin Zheng, David S. Albin , et al. · 2020

In this work, in-situ doping of CdTe/CdSeTe films with arsenic is performed using pre-doped source material prepared by high pressure Bridgman (HPB) melt growth. Arsenic level in the source material is varied from 10¹⁸-10^20…

Imaging hole-density inhomogeneity in arsenic-doped CdTe thin films by scanning capacitance microscopy Open

Chun‐Sheng Jiang, John Moseley, Chunhui Xiao, Steven P. Harvey, S. Farrell , et al. · 2020

Thin-Film Solar Cells with 19% Efficiency by Thermal Evaporation of CdSe and CdTe Open

Tursun Ablekim, Joel N. Duenow, Xin Zheng, Helio Moutinho, John Moseley , et al. · 2020

CdTe-based solar cells exhibiting 19% power conversion efficiency were produced using widely available thermal evaporation deposition of the absorber layers on SnO2-coated glass with or without a transparent MgZnO buffer layer. Evaporating…

Scalable ultrafast epitaxy of large-grain and single-crystal II-VI semiconductors Open

Eric Colegrove, David S. Albin, Helio Moutinho, Mahisha Amarasinghe, James M. Burst , et al. · 2020

CdTe synthesis and crystal growth using the high-pressure Bridgman technique Open

Tawfeeq K. Al-Hamdi, Seth W. McPherson, Santosh K. Swain, Joshah Jennings, Joel N. Duenow , et al. · 2020

Strain Mapping of CdTe Grains in Photovoltaic Devices Open

Irene Calvo‐Almazán, Xiaojing Huang, Hanfei Yan, Evgeny Nazaretski, Yong S. Chu , et al. · 2019

Strain within grains and at grain boundaries (GBs) in polycrystalline thin-film absorber layers limits the overall performance because of higher defect concentrations and band fluctuations. Yet, the nanoscale strain distribution in operati…

Recombination and bandgap engineering in CdSeTe/CdTe solar cells Open

Xin Zheng, Darius Kuciauskas, John Moseley, Eric Colegrove, David S. Albin , et al. · 2019

Selenium compositional grading in CdTe-based thin-film solar cells substantively improves carrier lifetime and performance. However, where and how recombination lifetime improves has not been studied significantly. Here, we deposit a CdSex…

Tailoring MgZnO/CdSeTe Interfaces for Photovoltaics Open

Tursun Ablekim, Craig L. Perkins, Xin Zheng, Carey Reich, Drew E. Swanson , et al. · 2019

Mg_xZn_1-xO (MZO) shows great promise to replace CdS as a buffer layer in CdTe-based solar cells. It is more transparent, and the MZO bandgap and electron density can be tuned, thus providing flexibility in controlling …

Overcoming Carrier Concentration Limits in Polycrystalline CdTe Thin Films with In Situ Doping Open

Brian E. McCandless, W.A. Buchanan, Christopher P. Thompson, Gowri Sriramagiri, Robert J. Lovelett , et al. · 2018

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