Control of the preferred orientations of Cu(In,Ga)Se2 films and the photovoltaic conversion efficiency using a surface-functionalized molybdenum back contact

Title
Control of the preferred orientations of Cu(In,Ga)Se2 films and the photovoltaic conversion efficiency using a surface-functionalized molybdenum back contact
Authors
윤주헌김원목박종극백영준성태연정증현
Keywords
CIGS solar cell; trilayer back contact; MoSe2; preferred orientation; cell efficiency
Issue Date
2014-01
Publisher
Progress in photovoltaics
Citation
VOL 22, NO 1, 69-76
Abstract
The surface microstructures of molybdenum (Mo) back contacts were shown to play a crucial role in the preferred orientations of Cu(In,Ga)Se2 (CIGS) films. The lower surface density of Mo tends to drive the growth of CIGS films toward favoring a (220)/(204) orientation, attributed to the higher likelihood of a MoSe2 reaction. This work showed that the presence of a very thin layer on a Mo bilayer facilitated the tuning of the CIGS grain orientations fromstrongly favoring (112) to strongly favoring (220)/(204) without sacrificing the electrode conductivity. The efficiency of Na-doped CIGS cells was increased toward decreasing Mo surface density, that is, increasing (220)/(204) CIGS orientation. Although slight changes in Na doping found between different Mo surface properties could contribute in part, the comparison with Na-reduced CIGS cells showed that it was more likely due to the (220)/(204) orientation-related enhancement of CdS/CIGS junction characteristics, which were possibly attributed to a favorable CdS reaction and a reduction in the defect metastabilities.
URI
http://pubs.kist.re.kr/handle/201004/47092
ISSN
10627995
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KIST Publication > Article
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