Highly ordered crystallization of α-FAPbI3 films via homogeneous seeds for efficient perovskite solar cells

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外文摘要：Formamidine lead triiodide(FAPbI3)perovskites have become the most promising photovoltaic materials for perovskite solar cells with record power conversion efficiency(PCE).However,random nucleation,phase transition,and lattice defects are still the key challenges limiting the quality of FAPbI3 films.Previous studies show that the introduction or adding of seeds in the precursor is effective to promote the nucleation and crystallization of perovskite films.Nevertheless,the seed-assisted approach focuses on heterogeneous seeds or hetero-composites,which inevitably induce a lattice-mismatch,the genera-tion of strain or defects,and the phase segregation in the perovskite films.Herein,we first demonstrate that high-quality perovskite films are controllably prepared using α-and δ-phases mixed FAPbI3 micro-crystal as the homogeneous seeds with the one-step antisolvent method.The partially dissolved seeds with suitable sizes improve the crystallinity of the perovskite film with preferable orientation,improved carrier lifetime,and increased carrier mobility.More importantly,the α-phase-containing seeds promote the formation of α-phase FAPbI3 films,leading to the reduction of residual lattice strain and the suppres-sion of I-ion migration.Besides,the adding of dimethyl 2,6-pyridine dicarboxylate(DPD)into the pre-cursor further suppresses the generation of defects,contributing to the PCE of devices prepared in air ambient being significantly improved to 23.75％,among the highest PCEs for fully air-processed FAPbI3 solar cells.The unpackaged target devices possess a high stability,maintaining 80％of the initial PCE under simulated solar illumination exceeding 800 h.

外文关键词：

Perovskite solar cellsFAPbI3Homogeneous seedsStrainPhase stability

作者：

Guohui Luo、Linfeng Zhang、Liyun Guo、Xiuhong Geng、Penghui Ren、Yi Zhang、Haihua Hu、Xiaoping Wu、Lingbo Xu、Ping Lin、Haiyan He、Xuegong Yu、Peng Wang、Can Cui

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作者单位：

Key Laboratory of Optical Field Manipulation of Zhejiang Province,Department of Physics,Zhejiang Sci-Tech University,Hangzhou 310018,Zhejiang,China

Zhejiang Provincial Key Laboratory of Fiber Materials and Manufacturing Technology,Zhejiang Sci-Tech University,Hangzhou 310018,Zhejiang,China

Hangzhou City University,Hangzhou 310015,Zhejiang,China

Key Laboratory of Solar Energy Utilization and Energy Saving Technology of Zhejiang Province,Zhejiang Baima Lake Laboratory Co.,Ltd.,Hangzhou 310012,Zhejiang,China

State Key Laboratory of Silicon Materials and School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Zhejiang ProvinceFundamental Research Funds of Zhejiang Sci-Tech UniversityOpen Project of Key Laboratory of Solar Energy Utilization and Energy Saving Technology of Zhejiang Province

项目编号：

6160413162025403LY19F04000923062120-YZJS-OP-2020-07

出版年：

2024

DOI：

10.1016/j.jechem.2024.03.014

能源化学

中国科学院大连化学物理研究所中国科学院成都有机化学研究所

能源化学

CSTPCDEI

影响因子：0.654

ISSN：2095-4956

年,卷(期)：2024.94(7)