Morphology and Performance Enhancement through the Strong Passivation Effect of Amphoteric Ions in Tin-based Perovskite Solar Cells

Du Hyeon Ryu, Nasir Khan, Jong Goo Park, Dooam Paik, Bong Joo Kang, Nam Joong Jeon, Seungjin Lee, Hang Ken Lee, Sang Kyu Lee, Won Suk Shin, Jong Cheol Lee, Hyungjun Kim, Ki Ha Hong, Sang Hyuk Im, Chang Eun Song

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Despite the optoelectronic similarities between tin and lead halide perovskites, the performance of tin-based perovskite solar cells remains far behind, with the highest reported efficiency to date being ≈14%. This is highly correlated to the instability of tin halide perovskite, as well as the rapid crystallization behavior in perovskite film formation. In this work, l-Asparagine as a zwitterion plays a dual role in controlling the nucleation/crystallization process and improving the morphology of perovskite film. Furthermore, tin perovskites with l-Asparagine show more favorable energy-level matching, enhancing the charge extraction and minimizing the charge recombination, leading to an enhanced power conversion efficiency of 13.31% (from 10.54% without l-Asparagine) with remarkable stability. These results are also in good agreement with the density functional theory calculations. This work not only provides a facile and efficient approach to controlling the crystallization and morphology of perovskite film but also offers guidelines for further improved performance of tin-based perovskite electronic devices.

Original languageEnglish
Article number2302418
JournalSmall
Volume19
Issue number39
DOIs
Publication statusPublished - 2023 Sept 27

Bibliographical note

Publisher Copyright:
© 2023 The Authors. Small published by Wiley-VCH GmbH.

Keywords

  • amphoteric ions
  • crystallinity
  • defect passivation
  • morphology
  • tin-based perovskite solar cells

ASJC Scopus subject areas

  • Biotechnology
  • General Chemistry
  • Biomaterials
  • General Materials Science
  • Engineering (miscellaneous)

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