Subgrain size inhomogeneities in the luminescence spectra of thin film chalcopyrites

被引：26

作者：

Guetay, Levent ^{[1
]}

Lienau, Christoph ^{[2
]}

Bauer, Gottfried Heinrich ^{[2
]}

机构：

[1] Univ Luxembourg, Lab Photovolta, L-4422 Belvaux, Luxembourg

[2] Carl von Ossietzky Univ Oldenburg, Inst Phys, D-26111 Oldenburg, Germany

来源：

APPLIED PHYSICS LETTERS | 2010年 / 97卷 / 05期

关键词：

CU(IN; GA)SE-2; SOLAR-CELLS; LOSSES; FLUCTUATIONS; LIMITATIONS;

D O I：

10.1063/1.3475018

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report near-field photoluminescence (PL) spectra of Cu(InGa)Se-2 thin films recorded with a lateral optical resolution of approximate to 200 nm and simultaneous detection of the sample topography. Our results reveal significant local variations in the PL spectra, specifically the PL yield, on length scales of 0.2-1.5 mu m. Local variations in both the splitting of quasi-Fermi levels mu and the band gap energy are quantitatively extracted from the PL spectra by applying Planck's generalized law. We show pronounced fluctuations of mu and the band gap on length scales below the grain size. These fluctuations are only weakly correlated with the topographic film structure. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3475018]

引用

页数：3

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