2D BA2 PbI4 Regulating PbI2 Crystallization to Induce Perovskite Growth for Efficient Solar Cells

Cong Shao; Jiandong He; Guosheng Niu; Yuan Dong; Kaiyi Yang; Xiaofei Cao; Jizheng Wang; Haixia Yang

doi:10.1002/smll.202309009

2D BA₂ PbI₄ Regulating PbI₂ Crystallization to Induce Perovskite Growth for Efficient Solar Cells

Small. 2023 Dec 15:e2309009. doi: 10.1002/smll.202309009. Online ahead of print.

Authors

Cong Shao¹, Jiandong He¹, Guosheng Niu¹, Yuan Dong¹, Kaiyi Yang¹, Xiaofei Cao¹, Jizheng Wang¹, Haixia Yang²

Affiliations

¹ Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China.
² Key Laboratory of Science and Technology on High-Tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China.

PMID: 38100243
DOI: 10.1002/smll.202309009

Abstract

Using seeds to control the crystallization of perovskite film is an effective strategy for achieving high-efficiency perovskite solar cells (PSCs). Owing to their excellent environmental stability brought by their long alkyl chain, n-butylammonium (BA) cations are widely used for fabricating efficient and stable PSCs. However, BA-based 2D perovskite is seldom been investigated as a seed. Here, BA₂ PbI₄ is employed to regulate the crystallization of PbI₂ , acting as nucleation centers. As a result, porous PbI₂ film with high crystallinity is obtained, which allows the realization of perovskite film with preferential crystal orientations of (001) and large grain size of over 2 µm. The corresponding PSC achieves a high power conversion efficiency (PCE) of 24.30% and exhibits satisfactory stability, retaining 91.70% of the initial PCE after 300 h of thermal aging at 85°C.

Keywords: 2D perovskite seeds; PbI2 crystallization; perovskite solar cells.