Arsenic doped Cd-rich CdTe: equilibrium doping limit and long lifetime for high open-circuit voltage solar cells greater than 900 mV

Nagaoka, Akira; Nishioka, Kensuke; Yoshino, Kenji; Kuciauskas, Darius; Scarpulla, Michael A.

doi:10.7567/1882-0786/ab27fb

Title: Arsenic doped Cd-rich CdTe: equilibrium doping limit and long lifetime for high open-circuit voltage solar cells greater than 900 mV

Journal Article · 07 July 2019 · Applied Physics Express

DOI: https://doi.org/10.7567/1882-0786/ab27fb · OSTI ID:1526454

Nagaoka, Akira ^[1]; Nishioka, Kensuke ^[1]; Yoshino, Kenji ^[1];

^[2]; Scarpulla, Michael A. ^[3]

Univ. of Miyazaki, Miyazaki (Japan)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Univ. of Utah, Salt Lake City, UT (United States)

The combination of group-V element doping and Cd-rich composition is the most promising current strategy for maximizing p-type doping while preserving long lifetime. In this study, we carefully measure the equilibrium p-type doping limit for As-doped Cd-rich CdTe single crystals and demonstrate a doping limit in the low 10¹⁷ cm^–3 range upon slow cooling. Here, we present evidence for self-compensation with rapidly decreasing doping efficiency per added As above 5 × 10¹⁶ cm^–3, yet we also demonstrate CdTe with >10¹⁷ cm^–3 hole concentration and bulk lifetime >30 ns. Such crystals allow As-doped CdTe photovoltaic devices with open-circuit voltage exceeding 900 mV.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1526454

Report Number(s):: NREL/JA--5900-74157

Journal Information:: Applied Physics Express, Journal Name: Applied Physics Express Journal Issue: 8 Vol. 12; ISSN 1882-0778

Publisher:: Japan Society of Applied PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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14 SOLAR ENERGY
71 CLASSICAL AND QUANTUM MECHANICS
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Title: Arsenic doped Cd-rich CdTe: equilibrium doping limit and long lifetime for high open-circuit voltage solar cells greater than 900 mV

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