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Diboron-Assisted Interfacial Defect Control Strategy for Highly Efficient Planar Perovskite Solar Cells

Diboron-Assisted Interfacial Defect Control Strategy for Highly Efficient Planar Perovskite Solar Cells

Yongguang Tu, Xiaoyu Yang, Rui Su, Deying Luo, Yang Cao, Lichen Zhao, Tanghao Liu, Wenqiang Yang, Yifei Zhang, Zhaojian Xu, Quanzhen Liu, Jihuai Wu, Qihuang Gong, Fanyang Mo, Rui Zhu

Adv Mater. 2018 Dec;30(49):e1805085.

PMID: 30294817

Abstract:

Metal halide perovskite films are endowed with the nature of ions and polycrystallinity. Formamidinium iodide (FAI)-based perovskite films, which include large cations (FA) incorporated into the crystal lattice, are most likely to induce local defects due to the presence of the unreacted FAI species. Here, a diboron-assisted strategy is demonstrated to control the defects induced by the unreacted FAI both inside the grain boundaries and at the surface regions. The diboron compound (C12 H10 B2 O4 ) can selectively react with unreacted FAI, leading to reduced defect densities. Nonradiative recombination between a perovskite film and a hole-extraction layer is mitigated considerably after the introduction of the proposed approach and charge-carrier extraction is improved as well. A champion power conversion efficiency of 21.11% is therefore obtained with a stabilized power output of 20.83% at the maximum power point for planar perovskite solar cells. The optimized device also delivers negligible hysteresis effect under various scanning conditions. This approach paves a new way for mitigating defects and improving device performance.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP879643717	Formamidinium iodide		879643-71-7	Price

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