Crystallinity and Phase Control in Formamidinium-Based Dion–Jacobson 2D Perovskite via Seed-Induced Growth for Efficient Photovoltaics

Guangbao Wu, Tanghao Liu, Mengxiao Hu, Zhipeng Zhang, Shilin Li, Linge Xiao, Jia Guo, Yueyang Wang, Annan Zhu, Wang Li, Huiqiong Zhou, Yuan Zhang*, Runfeng Chen*, Guichuan Xing*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

8 Citations (Scopus)


2D perovskites based on Formamidinium (FA) hold the potential for excellent stability and a broad absorption range, making them attractive materials for solar cells. However, FA-based 2D perovskites produced via one-step processing exhibit poor crystallinity and random quasi-quantum wells (QWs), leading to subpar photovoltaic performance. In this study, a seed-induced growth approach is introduced employing MAPbCl3 and BDAPbI4 in the deposition of FA-based Dion-Jacobson 2D perovskite films. This method yields high-quality perovskite films as the seeds preferentially precipitate and serve as templates for the epitaxial growth of FA-based counterparts, effectively suppressing the δ phase. Moreover, the epitaxial growth facilitated by uniformly dispersed seeds results in simultaneous crystallization from top to bottom, efficiently mitigating random phases (n = 2, 3, 4…) induced by the diffusion of organic cations and, in turn, minimizing energy loss. The impact of seed-induced growth on the crystallization and phase distribution of FA-based 2D perovskites is systematically investigated. As a result, the optimized FA-based 2D perovskite solar cell delivers an outstanding efficiency of 20.0%, accompanied by a remarkable fill factor of 0.823. Additionally, the unencapsulated device demonstrates exceptional stability, maintaining 98% of its initial efficiency after 1344 h of storage.

Original languageEnglish
Article number2303061
Number of pages11
JournalAdvanced Materials
Issue number36
Publication statusPublished - 7 Sept 2023

Scopus Subject Areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

User-Defined Keywords

  • Dion-Jacobson phase
  • efficiency of 20%
  • FA-based 2D perovskites
  • seed-induced growth
  • solar cells


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