DOE OSTI · 3683886
Impact of the Annealing Temperature on the Local Se Distribution and Optical Properties in CdSexTe1-x Solar Cells by Multimodal X-ray Microscopy
Abstract
The introduction of Se in CdTe solar-cell absorbers has led to multiple beneficial effects in the devices, including an increased short-circuit current and an extended charge-carrier lifetime. A critical manufacturing step of CdSexTe1-x solar cells is CdCl2 annealing at high temperatures, during which Se diffuses through the absorber layer. Understanding the local Se distribution in the absorber and its impact on optical properties of the material is key for the further development of this thin-film solar cell technology. In a multimodal x-ray scanning microscopy approach, we investigated the impact of the annealing temperature of CdSexTe1-x solar cells on the Se distribution and on optical characteristics of the material. For this purpose, we exploited an upgraded x-ray excited optical luminescence (XEOL) detection unit that enables simultaneous spectrally and temporally resolved XEOL mapping at synchrotron facilities that are ideal for studying thin-film solar-cell materials with hard x-rays featuring high penetration depth and lateral resolution.
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Barp Jr., Jackson [Deutsches Elektronen-Synchrotron DESY; Universitat Hamburg], Falkenberg, Gero [Deutsches Elektronen-Synchrotron DESY; Universitat Hamburg], Fevola, Giovanni [Deutsches Elektronen-Synchrotron DESY], Patjens, Svenja [Deutsches Elektronen-Synchrotron DESY], Pyrlik, Niklas [Deutsches Elektronen-Synchrotron DESY; Universitat Hamburg], Hampel, Sven [Deutsches Elektronen-Synchrotron DESY], Colegrove, Eric [National Laboratory of the Rockies, Golden, CO (United States)] (ORCID:0000000238112193), Mathew, Andrea [National Laboratory of the Rockies, Golden, CO (United States)], Garrevoet, Jan [Deutsches Elektronen-Synchrotron DESY], Falkenberg, Gerald [Deutsches Elektronen-Synchrotron DESY], Strelow, Christian [Universitat Hamburg], Kipp, Tobias [Universitat Hamburg], Schroer, Christian [Deutsches Elektronen-Synchrotron DESY; Universitat Hamburg], Stuckelberger, Michael [Deutsches Elektronen-Synchrotron DESY]. 2026-08-13. Impact of the Annealing Temperature on the Local Se Distribution and Optical Properties in CdSexTe1-x Solar Cells by Multimodal X-ray Microscopy. https://doi.org/10.1103/56gn-4mgn
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