Moisture is not always bad: H2O accelerates the conversion of DMAPbI3 intermediate to CsPbI3 for boosting the efficiency of carbon-based perovskite solar cells to over 16%

Hailiang Wang, Huicong Liu, Zijing Dong, Xueyuan Wei, Weiping Li, Liqun Zhu, Cheng Zhu, Yang Bai, Haining Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Inorganic CsPbI3 perovskite has exhibited great application potential in perovskite solar cells (PSCs) due to its suitable optical bandgap and high chemical stability. However, the perovskite phases of CsPbI3 are not stable at room temperature, where they transition to non-perovskite phases. Humidity or water has been thought to be the primary factor inducing this phase transition, which should be avoided throughout the procedure of film and device processing. Surprisingly, the present study indicates that preparing a precursor solution in humid air is beneficial to the growth of high-quality CsPbI3 perovskite to enhance device performance. It is demonstrated that the incorporation of H2O in the precursor solution from humid air or by intentional addition significantly changes the composition of coordination compounds and increases the amount of low iodine coordination complexes. As a result, the crystallization of dimethylammonium lead iodide (DMAPbI3) intermediate is suppressed well, which accelerates its subsequent conversion to CsPbI3 perovskite. Consequently, an oriented CsPbI3 perovskite film with improved crystallinity and lower defect density is obtained. Most importantly, carbon-based PSCs (C-PSCs) based on the CsPbI3 perovskite film achieve an efficiency of 16.05%, a new record for inorganic C-PSCs.

Original languageEnglish
Pages (from-to)1110-1117
Number of pages8
JournalFundamental Research
Volume4
Issue number5
DOIs
Publication statusPublished - Sept 2024

Keywords

  • Carbon electrode
  • CsPbI
  • Inorganic perovskite
  • Solar cells
  • Water

Fingerprint

Dive into the research topics of 'Moisture is not always bad: H2O accelerates the conversion of DMAPbI3 intermediate to CsPbI3 for boosting the efficiency of carbon-based perovskite solar cells to over 16%'. Together they form a unique fingerprint.

Cite this