[5p-S21-1~7] The history and future of Multinary Compounds and Solar Cells - 30th anniversary symposium of Professional Group of Multinary Compounds and Solar Cells -

[5p-S21-6] Evaluation of electronic structure of grain boundaries in CIGSSe absorbers by KPFM

〇Shingo Kubo¹, Tsuyoshi Sawada¹, Suehiro Kawamura¹, Takuya Shimamura¹, Yuya Iwamoto¹, Kouhei Tanigawa¹, Kato Takuya², Hironori Sugimoto², Shogo Ishizuka³, Hajime Shibata³, Koji Matsubara³, Shigeru Niki³, Norio Terada¹ (1.Kagoshima Univ., 2.Solar Frontier, 3.AIST)

Keywords:Cu(In, Ga)(S, Se)2, Kelvin probe force microscopy

CuInSe₂-based solar cells have realized a conversion efficiency above 22%. In addition to the reduction of bulk defects, control of electronic activities of grain boundaries (GBs) in the absorber get crucial subjects for further improvement of it. In the present study, we have attempted the characterization of electronic structure of the GBs in the high performance cells by means of UHV-KPFM.