Ultra-smooth CsPbI2Br film via programmable crystallization process for high-efficiency inorganic perovskite solar cells
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第7期
论文作者：Fu Zhang Zhu Ma Taotao Hu Rui Liu Qiaofeng Wu Yu Yue Hua Zhang Zheng Xiao Meng Zhang Wenfeng Zhang Xin Chen Hua Yu
文章页码：150 - 156
摘 要：CsPbI2Br is an ideal inorganic perovskite material with a reasonable bandgap for solar cell applications because of its advantage of superior thermal and phase stability. However, the performance of CsPbI2Br based solar cells highly relied on the perovskite crystallization process along with the interfacial contact engineering process between CsPbI2Br perovskite and charge-transporting layers. In this work, a programmable crystallization method is developed to obtain ultra-smooth CsPbI2Br perovskite film with a well-engineered contact interface in perovskite solar cells. This method combines a pre-stand-by process with a programmable gradient thermal engineering process, which mediates the crystal growth dynamics process of CsPbI2Br perovskite by controlling the release of dimethyl sulfoxide（DMSO） from its coordinates with the perovskite film, leading to high-quality CsPbI2Br film with large-scale crystalline grains, reduced surface roughness, and low trap density. Fabricated perovskite devices based on CsPbI2Br film obtained by this method deliver power conversion efficiency of 14.55 %; meanwhile, the encapsulated CsPbI2Br perovskite device achieves a maximum efficiency of 15.07 %. This decent solar conversion efficiency demonstrates the effectiveness of the programmable crystallization method used in this work,which shows great potential as a universal approach in obtaining high-quality CsPbI2Br perovskite films for fabricating high-efficiency inorganic perovskite solar cells.
Fu Zhang1，Zhu Ma1，Taotao Hu1，Rui Liu1，Qiaofeng Wu1，Yu Yue1，Hua Zhang1，Zheng Xiao1，Meng Zhang1，Wenfeng Zhang1，Xin Chen2，Hua Yu1
1. Institute of Photovoltaics, Southwest Petroleum University2. Center for Computational Chemistry and Molecular Simulation, College of Chemistry and Chemical Engineering, Southwest Petroleum University
摘 要：CsPbI2Br is an ideal inorganic perovskite material with a reasonable bandgap for solar cell applications because of its advantage of superior thermal and phase stability. However, the performance of CsPbI2Br based solar cells highly relied on the perovskite crystallization process along with the interfacial contact engineering process between CsPbI2Br perovskite and charge-transporting layers. In this work, a programmable crystallization method is developed to obtain ultra-smooth CsPbI2Br perovskite film with a well-engineered contact interface in perovskite solar cells. This method combines a pre-stand-by process with a programmable gradient thermal engineering process, which mediates the crystal growth dynamics process of CsPbI2Br perovskite by controlling the release of dimethyl sulfoxide（DMSO） from its coordinates with the perovskite film, leading to high-quality CsPbI2Br film with large-scale crystalline grains, reduced surface roughness, and low trap density. Fabricated perovskite devices based on CsPbI2Br film obtained by this method deliver power conversion efficiency of 14.55 %; meanwhile, the encapsulated CsPbI2Br perovskite device achieves a maximum efficiency of 15.07 %. This decent solar conversion efficiency demonstrates the effectiveness of the programmable crystallization method used in this work,which shows great potential as a universal approach in obtaining high-quality CsPbI2Br perovskite films for fabricating high-efficiency inorganic perovskite solar cells.
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