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

Ju Heon Yoon, Won Mok Kim, Jong Keuk Park, Young Joon Baik, Tae Yeon Seong, Jeung Hyun Jeong

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

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 from strongly 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.

Original languageEnglish
Pages (from-to)69-76
Number of pages8
JournalProgress in Photovoltaics: Research and Applications
Volume22
Issue number1
DOIs
Publication statusPublished - 2014 Jan

Keywords

  • CIGS solar cell
  • MoSe
  • cell efficiency
  • preferred orientation
  • trilayer back contact

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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