Improved efficiency and air stability of two-dimensional p-i-n inverted perovskite solar cells by Cs doping

Tzu Chien Hsieh, Chung Yueh Shih, Yu Chiang Chao*, I. Chun Cheng, Jian Zhang Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Two-dimensional perovskite solar cells (2-D PSCs) have attracted much research attention in recent years because they are more stable in a regular environment than three-dimensional (3-D) ones are. In this study, we doped Cs into 2D perovskite (BA2(MA)2Pb3I10) films as the absorbing layers of the 2-D p-i-n inverted PSCs to investigate the influence of the Cs doping concentration on the properties of the 2-D perovskite films and the fabricated solar cells. Cs doping clearly improves the power conversion efficiency (PCE) and air stability of the PSCs. Doping perovskite with 10% Cs (the best doping concentration in this study) can increase the PSC efficiency from 7.98% to 10.11%. Scanning electron microscopy indicates the improved surface quality and crystallinity by Cs doping. However, excess Cs doping degrades the PCE of the PSCs. Furthermore, 10% Cs doped PSCs show air stability superior to that of undoped ones in unpackaged humidity environments. After exposure to 55% relative humidity (RH) in 19 °C air for 300 h, the PCE of the PSC decreased by only 39%, in contrast to 84% for the undoped PSC.

Original languageEnglish
Pages (from-to)20200-20206
Number of pages7
JournalRSC Advances
Volume11
Issue number33
DOIs
Publication statusPublished - 2021 Jun 7

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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