Precise Control of Crystal Growth for Highly Efficient CsPbI2Br Perovskite Solar Cells

By Weijie Chen, Haiyang Chen, Guiying Xu, Rongming Xue, Shuhui Wang, Yaowen Li, Yongfang Li. Joule, 2019

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Summary All-inorganic perovskite solar cells (pero-SCs) are attracting considerable attention due to their promising thermal stability, but their inferior power-conversion efficiency (PCE) and moisture instability are hindering their application. Here, we used a gradient thermal annealing (GTA) method to control the growth of α-CsPbI2Br crystals and then utilized a green anti-solvent (ATS) isopropanol to further optimize the morphology of α-CsPbI2Br film. Through this GTA-ATS synergetic effect, the growth of α-CsPbI2Br crystals could be precisely controlled, leading to a high-quality perovskite film with one-micron average grain size, low root-mean-square of 25.9 nm, and reduced defect density. Pero-SCs based on this CsPbI2Br film achieved a champion scan PCE of 16.07% (stabilized efficiency of 15.75%), which is the highest efficiency reported in all-inorganic pero-SCs. Moreover, the CsPbI2Br pero-SC demonstrates excellent robustness against moisture and oxygen, and maintains 90% of initial PCE after aging 120 hr under 100 mW/cm2 UV irradiation.

Subfields: Electrical and Electronic Engineering, Materials Chemistry, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/39ba9f82444b1d017bd8a0190f177717f1b2a483