Multidentate anchoring through additive engineering for highly efficient Sb2S3 planar thin film solar cells

Jian Han, Xingyu Pu, Hui Zhou, Qi Cao, Shuangjie Wang, Jiabao Yang, Junsong Zhao, Xuanhua Li

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Sb2S3 is a promising candidate for the flexible solar cells or the top subcells in tandem solar cells due to its wide-bandgap, less toxic, acceptable cost and progressive power conversion efficiency (PCE). However, the poor quality and high trap states of Sb2S3 films limit the device performance further enhancement. Herein, we adopt a multidentate ionic liquid, tetramethylammonium hexafluorophosphate ([TMA][PF6]) as a novel additive to address this issue. The octahedral [PF6] contains six different oriented fluorine atoms with the lone pair electrons, which could coordinate with Sb atoms due to the multidentate anchoring. Thus, the high-quality Sb2S3 film with low trap states has been achieved. Moreover, the Fermi level of the Sb2S3 film has been upshifted, thereby showing an effective charge transfer. As a result, all photovoltaic parameters of the optimized Sb2S3 devices are obviously enhanced, boosting the final PCE from 4.43 (control device) to 6.83 %. Our study about the multidentate anchoring is manifested to be an effective method to enhance the Sb2S3 device performance.

Original languageEnglish
Pages (from-to)36-44
Number of pages9
JournalJournal of Materials Science and Technology
Volume89
DOIs
StatePublished - 30 Oct 2021

Keywords

  • Additive engineering
  • Multidentate anchoring
  • Passivation
  • SbS
  • Solar cells

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