Uncovering synergistic effect of chloride additives for efficient quasi-2D perovskite solar cells

Ze Wang, Li Liu, Xiaodong Liu, Dandan Song, Dong Shi, Shuanghong Wu, Yunwei Tong, Hui Ren, Mingjie Li, Yonghao Zheng, Dewei Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)

Abstract

Methylammonium chloride (MACl) and lead chloride (PbCl2) are commonly used for improving perovskite film quality. However, the rapid release of volatile MACl would lead to low-quality perovskite films with pinholes and defects. Here, we report a strategy of employing MACl&PbCl2 binary additives together to prepare high-quality quasi-two-dimensional (Q-2D) Ruddlesden–Popper (RP) perovskite films. We found that MAPbCl3 intermediate phase is formed via a reaction between MACl and PbCl2, which suppresses the fast volatilization of MACl, resulting in a compact and pinhole-free perovskite film with large grains. Moreover, the trap states are passivated via the incorporation of Cl into the Q-2D perovskite crystals along with the addition of PbCl2, leading to a reduced charge recombination loss and an improved charge extraction. A remarkable power conversion efficiency (PCE) of 18.67% is achieved in such Q-2D RP PSCs, one of the highest PCE values among the low-dimensional RP PSCs with n ≤ 4. The environmental stability of the devices is also significantly enhanced. Our results provide an effective strategy by using chloride based additives for fabricating high-quality low-dimensional RP perovskite films for efficient solar cells.

Original languageEnglish
Article number134367
JournalChemical Engineering Journal
Volume432
DOIs
Publication statusPublished - 15 Mar 2022

Keywords

  • Charge extraction
  • Chloride additives
  • Intermediate phase
  • Passivation
  • quasi-2D perovskite solar cells

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Fingerprint

Dive into the research topics of 'Uncovering synergistic effect of chloride additives for efficient quasi-2D perovskite solar cells'. Together they form a unique fingerprint.

Cite this