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Self-Driven Prenucleation-Induced Perovskite Crystallization Enables Efficient Perovskite Solar Cells |
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| Authors: | Yao Wang Lingcong Li Zhujie Wu Ruike Zhang Jin Hong Jianxin Zhang Dr Huashang Rao Prof Zhenxiao Pan Prof Xinhua Zhong |
| Institution: | 1. Key Laboratory for Biobased Materials and Energy of Ministry of Education, Guangdong Laboratory for Lingnan Modern Agriculture, College of Materials and Energy, South China Agricultural University, 483 Wushan Road, Guangzhou, 510642 China
These authors contributed equally to this work. Contribution: Data curation (lead), Investigation (lead), Writing - original draft (lead);2. Key Laboratory for Biobased Materials and Energy of Ministry of Education, Guangdong Laboratory for Lingnan Modern Agriculture, College of Materials and Energy, South China Agricultural University, 483 Wushan Road, Guangzhou, 510642 China School of Chemistry and Civil Engineering, Shaoguan University, Shaoguan, 512005 China These authors contributed equally to this work. Contribution: Data curation (equal), Writing - original draft (equal);3. Key Laboratory for Biobased Materials and Energy of Ministry of Education, Guangdong Laboratory for Lingnan Modern Agriculture, College of Materials and Energy, South China Agricultural University, 483 Wushan Road, Guangzhou, 510642 China Contribution: Data curation (supporting);4. Key Laboratory for Biobased Materials and Energy of Ministry of Education, Guangdong Laboratory for Lingnan Modern Agriculture, College of Materials and Energy, South China Agricultural University, 483 Wushan Road, Guangzhou, 510642 China |
| Abstract: | Perovskite film with high crystal quality is fundamental to achieving high-performance solar cells. A fast nucleation process is crucial to improving the crystallization quality. Here, we propose a self-driven prenucleation strategy to achieve fast nucleation. This is realized through rational solvent design. The key characteristics of different solvents are systematically evaluated. Among them, formamide, with ultra-high dielectric constant, low Gutman donor number, and a high boiling point, is selected as the co-solvent. These unique characteristics render formamide a double-face solvent that is a good solvent for formamidinium iodide (FAI) and CsI while a poor solvent for PbI2. As a result, formamide induces the self-driven prenucleation of PbI2-DMSO seeding crystals and accelerates the nucleation, improving the crystalline quality of perovskite film. The efficiency of the hole transport layer-free carbon-based perovskite solar cells is boosted beyond 19 % for the first time. |
| Keywords: | Carbon Formamide Perovskite Prenucleation Solar Cells |