5 years ago

The Role of Synthesis Parameters on Crystallization and Grain Size in Hybrid Halide Perovskite Solar Cells

The Role of Synthesis Parameters on Crystallization and Grain Size in Hybrid Halide Perovskite Solar Cells
Feihong Huang, Jinkui Song, Jianyou Chen, Shuangshuang Liu, Hao Li, Yan Shen, Mingkui Wang
Antisolvent method has been widely applied to fabricate hybrid halide perovskite solar cells. However, the quality of perovskite film is unable to effectively control for the excessively fast crystallization. In this work, we investigated the effect of precursor concentration and spinning speed as well as additive CH3NH3Cl on quality perovskite film and thus the performance solar cells. The growth of crystal toward the orientation parallel to the direction of facet (002)/(004) slows down as the concentration and spinning speed increases. The lattice constants points out the expansion of crystal size in the direction along the c-axis of around 0.04 Å due to the size difference between I and Cl ions. A vertical growth mechanism was proposed to elaborate the crystallite growth of CH3NH3PbI3(Cl) perovskite film. Consequently, the perovskite solar cell efficiency impressively increases from ∼12% to ∼16% along enlarging the crystal size. Various advanced characterization techniques including ultrafast spectroscopy and electronic impedance spectroscopy elucidated that an optimal film with large grain size and less defect states could result in the enhancement of charge transport and collection efficiency.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b03279

DOI: 10.1021/acs.jpcc.7b03279

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