Mechanisms of extrinsic alkali incorporation in CIGS solar cells on flexible polyimide elucidated by nanoscale and quantitative analyses

Kihwan Kim, Inyoung Jeong, Yunae Cho, Donghyeop Shin, Soomin Song, Seung Kyu Ahn, Young Joo Eo, Ara Cho, Chanwon Jung, William Jo, Jin Hyeok Kim, Pyuck Pa Choi, Jihye Gwak, Jae Ho Yun

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19 Scopus citations

Abstract

In this work, Cu(In,Ga)Se2 (CIGS) solar cells on polyimide (PI) substrates were fabricated using a low-temperature three-stage co-evaporation process. To enhance device performance, the CIGS films were extrinsically doped with alkali (Na and K) using an in-situ post deposition treatment (PDT). To account for mechanisms of extrinsic alkali incorporation in CIGS solar cells on flexible polyimide, the alkali dopant concentrations in the film bulk (intragrain and grain boundary) and the surface chemistries/band structures were quantitatively investigated with various advanced characterization methods. In addition, the effects of the PDT sequences on the resulting device performance were studied with a particular emphasis on the characteristics of CIGS surfaces. By controlling the alkali incorporation into the CIGS absorber films, flexible lightweight CIGS thin-film solar cells with an efficiency of approximately 19% were obtained.

Original languageEnglish
Article number104201
JournalNano Energy
Volume67
DOIs
StatePublished - Jan 2020

Keywords

  • Atom probe tomography
  • CIGS
  • Flexible
  • Polyimide
  • Solar cells

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