Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
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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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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