Band-gap-graded Cu2 ZnSn(S1-x,Se x) 4 solar cells fabricated by an ethanol-based, particulate precursor ink route

Kyoohee Woo, Youngwoo Kim, Wooseok Yang, Kyujin Kim, Inhyuk Kim, Yunjung Oh, Jin Young Kim, Jooho Moon

Research output: Contribution to journalArticle

90 Citations (Scopus)

Abstract

Solution processing of earth-abundant Cu 2 ZnSn(S 1-x,Se x) 4 (CZTSSe) absorber materials is an attractive research area in the economical and large-scale deployment of photovoltaics. Here, a band-gap-graded CZTSSe thin-film solar cell with 7.1% efficiency was developed using non-toxic solvent-based ink without the involvement of complex particle synthesis, highly toxic solvents, or organic additives. Despite the high series resistance due to the presence of a thick Mo(S,Se) x layer and Zn(S,Se) aggregates, a high short-circuit current density (J SC) was generated. In addition, there was no significant difference in open circuit voltages (V OC) between CZTS (0.517 V) and CZTSSe (0.505-0.479 V) cells, despite a significant band gap change from 1.51 eV to 1.24 eV. The high J SC and less loss of V OC are attributed to the effect of band gap grading induced by Se grading in the CZTSSe absorber layer. Our environmentally benign ink approach will enable the realization of low-cost, large-area, high-efficiency thin-film solar cells.

Original languageEnglish
Article number3069
JournalScientific reports
Volume3
DOIs
Publication statusPublished - 2013 Nov 11

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