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

27 Citations (Scopus)


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
Publication statusPublished - 15 Mar 2022


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

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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