Dual-Wavelength Time-Resolved Photoluminescence Study of CdSexTe1-x Surface Passivation via MgyZn1-yO and Al2O3

McGott, Deborah L.; Good, Brian; Fluegel, Brian; Duenow, Joel N.; Wolden, Colin A.; Reese, Matthew O.

doi:10.1109/jphotov.2021.3124169

Title: Dual-Wavelength Time-Resolved Photoluminescence Study of CdSe_xTe_1-x Surface Passivation via Mg_yZn_1-yO and Al₂O₃

Journal Article · Wed Nov 24 00:00:00 EST 2021 · IEEE Journal of Photovoltaics

DOI:https://doi.org/10.1109/jphotov.2021.3124169· OSTI ID:1836029

^[1]; Good, Brian ^[2]; Fluegel, Brian ^[3];

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^[3]

National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Illinois, Chicago, IL (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Colorado School of Mines, Golden, CO (United States)

Voltage loss is currently one of the biggest challenges facing cadmium telluride (CdTe) based photovoltaics. Determining the location(s) of major voltage loss within the device stack (e.g., front/back interface, grain boundaries) is therefore of primary interest. Here, we present a custom-built time-resolved photoluminescence system with two excitation wavelengths - 670 (standard) and 405 nm - to probe the device stack at depths of approximately 130 and 35 nm, respectively; their comparison helps differentiate interface and bulk contributions to carrier lifetime. We apply this system to examine the passivation effect of two significant recent advances in CdTe: the incorporation of Se to form graded CdSe _x Te _1-x and the replacement of CdS with Mg _y Zn _1-y O. It is found that x = 0.2 Se is required to obtain lifetime improvements, primarily in the bulk. Additionally, evidence for trapping at the Mg _y Zn _1-y O/CdSe _x Te _1-x interface was observed. Furthermore, this indicates further work is required to sufficiently passivate the front interface.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1836029

Report Number(s):: NREL/JA-5K00-80301; MainId:42504; UUID:1beed579-c572-407d-b10a-b1500ec26d8b; MainAdminID:63250

Journal Information:: IEEE Journal of Photovoltaics, Vol. 12, Issue 1; ISSN 2156-3381

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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