Flash-evaporation Printing Methodology for Perovskite Thin Films and Efficient Solar Cells
Meiqian Tai a, Xingyue Zhao a, Hong Lin a
a State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Meiqian Tai, 069
Publication date: 11th February 2019


Lead halide based perovskites have been emerging as promising light-harvesting materials for high-efficiency solar cells recently. Compared to solution-based methods, vapor-based deposition technologies are more suitable in preparing compact, uniform, and large-scale perovskite thin films. In this study, a flash-evaporation printing (FEP) technology realized by incorporating a physical vapor deposition technique and a printing method was developed to provide an efficient approach for printing high-quality thin films. A freestanding carbon nanotube (CNT) sheet that has an ultrasmall heat capacity and fast thermal response was used as the evaporator, and the precursor material precoated on the CNT evaporator was printed onto substrates by laser-induced gas-phase transportation. We have deposited uniform MAPbI3 and CsPbI2Br films with balanced stoichiometry via this FEP method by controlling precursor composition. The film crystallinity and crystal grain growth could further be promoted after post annealing. Planar solar cells employing these perovskite films exhibit high power conversion efficiencies (PCE) comparable to that using traditional solution and vapor-based methods. Large-area (1 cm2) devices based on MAPbI3 and CsPbI2Br films also achieved PCE of 12.1% and 9.4%, indicating the feasibility and scalability of our FEP method in fabricating large-area perovskite films for efficient and up-scaling photovoltaics. Moreover, patterned perovskite films can also be prepared by FEP using a shadow mask or point-by-point printing technique, and the compact geometry allows for convenient scale-up for large panel applications.



This work was supported by the Projects of International Cooperation and Exchanges NSFC (51561145007), the National Natural Science Foundation of China NSFC (51772166, 51472142, 61774090) and the Ministry of Science & Technology, P. R. China: Sino-Italy International Cooperation on Innovation (2016YFE0104000).


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