High Efficiency Quasi-2D/3D Pb–Ba Perovskite Solar Cells via Phenethylammonium Chloride Addition

Shun Hsiang Chan, Yin Hsuan Chang, Meng Huan Jao, Kai Chi Hsiao, Kun Mu Lee, Chao Sung Lai, Ming Chung Wu*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

5 Scopus citations

Abstract

The existence of toxic Pb in perovskite solar cells may hinder the pace of commercialization. Based on the previous work, Ba2+ is most suitable for partially replacing Pb2+ among alkaline-earth metal cations. However, a high substitution ratio may lead to poor film coverage. A detailed study of the effects on film formation with phenethylammonium chloride (PEACl) additive for large n (n > 40) quasi-2D/3D mixed-cation Pb–Ba perovskite (i.e. PEAxMA0.4−xFA0.6Pb0.9Ba0.1IyCl3−y) is presented. The perovskite layer with defects passivation exhibits efficient charge-carrier transport, suppression of trap-assisted recombination, and improved electron extraction capability. The mapping distribution of surface potentials is quantified by photo-assisted Kelvin probe force microscopy to verify the carrier generation. Consequently, the power conversion efficiency (PCE) of the PEAxMA0.4−xFA0.6Pb0.9Ba0.1IyCl3−y perovskite solar cell is enhanced significantly from an averaged PCE of 15.0% of the pristine active layer to 18.1% and the champion PCE can achieve 19.1%. The corresponding device shows outstanding long-term stability in air, retaining 90% of its initial PCE for more than 700 h. Herein, a promising strategy to passivate defects and improve the perovskite film quality for superior optoelectronic properties is provided.

Original languageEnglish
Article number2101098
JournalSolar RRL
Volume6
Issue number6
DOIs
StatePublished - 06 2022

Bibliographical note

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

  • Pb–Ba perovskite absorbers
  • perovskite solar cells
  • quasi-2D
  • stability

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