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Title: Electron-beam-induced current at absorber back surfaces of Cu(In,Ga)Se{sub 2} thin-film solar cells

The present work reports on investigations of the influence of the microstructure on electronic properties of Cu(In,Ga)Se{sub 2} (CIGSe) thin-film solar cells. For this purpose, ZnO/CdS/CIGSe stacks of these solar cells were lifted off the Mo-coated glass substrates. The exposed CIGSe backsides of these stacks were investigated by means of electron-beam-induced current (EBIC) and cathodoluminescence (CL) measurements as well as by electron backscattered diffraction (EBSD). EBIC and CL profiles across grain boundaries (GBs), which were identified by EBSD, do not show any significant changes at Σ3 GBs. Across non-Σ3 GBs, on the other hand, the CL signals exhibit local minima with varying peak values, while by means of EBIC, decreased and also increased short-circuit current values are measured. Overall, EBIC and CL signals change across non-Σ3 GBs always differently. This complex situation was found in various CIGSe thin films with different [Ga]/([In]+[Ga]) and [Cu]/([In]+[Ga]) ratios. A part of the EBIC profiles exhibiting reduced signals across non-Σ3 GBs can be approximated by a simple model based on diffusion of generated charge carriers to the GBs.
Authors:
; ; ; ; ; ; ;  [1] ; ;  [2]
  1. Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz. 1, 14109 Berlin (Germany)
  2. Institut für Festkörperphysik, Friedrich Schiller Universität Jena, Max-Wien-Platz 1, 07743 Jena (Germany)
Publication Date:
OSTI Identifier:
22271288
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BACKSCATTERING; CADMIUM SULFIDES; CATHODOLUMINESCENCE; CHARGE CARRIERS; COPPER SELENIDES; DIFFUSION; ELECTRON DIFFRACTION; GALLIUM SELENIDES; GRAIN BOUNDARIES; HETEROJUNCTIONS; INDIUM SELENIDES; SCANNING ELECTRON MICROSCOPY; SOLAR CELLS; SUBSTRATES; SURFACES; THIN FILMS; ZINC OXIDES