13.7%-efficient Zn(Se,OH)x/ Cu(In,Ga)(S,Se)2 thin-film solar cell

A. Ennaoui, U. Blieske, M. Ch Lux-Steiner

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Cu(In,Ga)Se2 (CIGS) and related semiconducting compounds have demonstrated their high potential for high-efficiency thin-film solar cells. The highest efficiency for CIGS-based thin-film solar cells has been achieved with CdS buffer layers prepared by a solution growth method known as chemical bath deposition (CBD). With the aim of developing Cd-free chalcopyrite-based thin-film solar cells, Zn(Se,OH)x buffer layers were deposited by CBD on polycrystalline Cu(In,Ga) (S,Se)2 (CIGSS). A total-area conversion efficiency of 13.7% was certified by the Frauenhofer Institute for Solar Energy Systems. The CIGSS absorber was fabricated by Siemens Solar Industries (California). For device optimization, the thickness and good surface coverage were controlled by XPS-UPS photoemission spectroscopy. A Zn(Se,OH)x thickness below 7 nm has been found to be optimum for achieving a homogeneous and compact buffer film on CIGSS, with open-circuit photovoltage Voc = 535 mV, fill factor FF = 70.76% and a high short-circuit photocurrent density Jsc = 36.1 mA cm-2.

Original languageEnglish
Pages (from-to)447-451
Number of pages5
JournalProgress in Photovoltaics: Research and Applications
Issue number6
Publication statusPublished - Nov 1998
Externally publishedYes


ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment
  • Physics and Astronomy (miscellaneous)

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