Enhancement in the photovoltaic performance of planar perovskite solar cells by perovskite cluster engineering using an interfacial energy modifier

The grain size and quality of hybrid organic-inorganic perovskite (HOIP) films greatly affect the performance of perovskite solar cells (PSCs). However, dripping an anti-solvent during the spin coating process induces rapid nucleation and reduces the grain size. Here, a facile method is developed to...

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Bibliographic Details
Published in:Nanoscale 2019-02, Vol.11 (7), p.3216-3221
Main Authors: Li, Bichen, Chen, Zhihui, Yao, Hongyan, Guan, Xin, Yu, Zhimeng, Halis Isikgor, Furkan, Coskun, Hikmet, Xu, Qing-Hua, Ouyang, Jianyong
Format: Article
Language:English
Subjects:
Chlorobenzene
Clusters
Grain size
Interfacial energy
Nucleation
Perovskites
Photovoltaic cells
Precursors
Solar cells
Solvents
Spin coating
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Summary:The grain size and quality of hybrid organic-inorganic perovskite (HOIP) films greatly affect the performance of perovskite solar cells (PSCs). However, dripping an anti-solvent during the spin coating process induces rapid nucleation and reduces the grain size. Here, a facile method is developed to engineer clusters in precursor solution and obtain high-quality perovskite films with an enlarged grain size. A cluster interfacial modifier, chlorobenzene (CB), is added to precursor solution. The modifier increases the interfacial energy between the precursor cluster and the solvent. The increased interfacial energy suppresses the nucleation and gives rise to HOIP films with large grains and high crystallinity. The efficiency of PSCs based on this method is greatly improved from 17.55% to 19.5%.
ISSN:2040-3364
2040-3372
DOI:10.1039/c8nr10125f