A Polymer Defect Passivator for Efficient Hole-Conductor-Free Printable Mesoscopic Perovskite Solar Cells

Junwei Xiang, Chuanzhou Han, Jianhang Qi, Yanjie Cheng, Kai Chen, Yongming Ma, Jiayu Xie, Yue Hu, Anyi Mei, Yinhua Zhou*, Hongwei Han

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Due to the low cost and excellent potential for mass production, printable mesoscopic perovskite solar cells (p-MPSCs) have drawn a lot of attention among other device structures. However, the low open-circuit voltage (VOC) of such devices restricts their power conversion efficiency (PCE). This limitation is brought by the high defect density at perovskite grain boundaries in the mesoporous scaffold, which results in severe nonradiative recombination and is detrimental to the VOC. To improve the perovskite crystallization process, passivate the perovskite defects, and enhance the PCE, additive engineering is an effective way. Herein, a polymeric Lewis base polysuccinimide (PSI) is added to the perovskite precursor solution as an additive. It improves the perovskite crystallinity and its carbonyl groups strongly coordinate with Pb2+, which can effectively passivate defects. Additionally, compared with its monomer, succinimide (SI), PSI serves as a better defect passivator because the long-chained macromolecule can be firmly anchored on those defect sites and form a stronger interaction with perovskite grains. As a result, the champion device has a PCE of 18.84%, and the VOC rises from 973 to 1030 mV. This study offers a new strategy for fabricating efficient p-MPSCs.

Original languageEnglish
JournalAdvanced Functional Materials
Early online date15 Mar 2023
DOIs
Publication statusE-pub ahead of print - 15 Mar 2023

Keywords / Materials (for Non-textual outputs)

  • carbon electrodes
  • crystallization improvements
  • defect passivation
  • polymeric Lewis bases
  • printable mesoscopic perovskite solar cells

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