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Influence of CdS and ZnSnO Buffer Layers on the Photoluminescence of Cu(In,Ga)Se $_2$ Thin Films

Authors: Pedro M. P. Salomé; Jennifer P. Teixeira; Jan Keller; Tobias Törndahl; Sascha Sadewasser; Joaquim P. Leitão;

Influence of CdS and ZnSnO Buffer Layers on the Photoluminescence of Cu(In,Ga)Se $_2$ Thin Films

Abstract

The search for alternatives to the CdS buffer layer in Cu(In,Ga)Se $_2$ (CIGS) solar cells has turned out to be quite promising in terms of power conversion efficiency. In this paper, the typically used chemical-bath-deposited CdS layer is compared with an atomic-layer-deposited Zn $_{1-x}$ Sn $_{x}$ O $_{y}$ (ZnSnO). An optical study by external quantum efficiency and photoluminescence on the influence of different buffer layers on the defect properties of CIGS is presented. For both buffer layers, the CIGS bulk and CIGS/buffer interface are strongly influenced by electrostatic fluctuating potentials, which are less pronounced for the sample with the ZnSnO buffer layer. This is associated with a lower concentration of donor defects at the CIGS near-interface layer. A change in the bandgap of the CIGS as a consequence of the buffer layer deposition is observed. This study expands the knowledge of defects in the complex quaternary semiconductor CIGS, which, as discussed, can be affected even by the choice of buffer layer and its deposition process.

Country
Portugal
Keywords

CdS buffer layer, Cu(In,Ga)Se 2 (CIGS), Zn1-xSnxOy buffer layer, Thin-film solar cells, Photoluminescence

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
views
OpenAIRE UsageCountsViews provided by UsageCounts
downloads
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22
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