Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Several techniques have already been developed to elaborate high-quality perovskite films for photovoltaic (PV) application, and to further improve the crystallization of the active layer [1]. Up to now, spin coating is the most used technique for perovskite solar cells deposition, either by a one-step or a two-step method [2]. It gives good results but presents limitations in terms of deposition area’s size and compatible type of substrates. Alternative methods should be developed. The biggest challenge is to find a better deposition technique that gives high-quality perovskite layers on large size substrates, with a minimum manufacturing cost. Herein, the electrodeposition method was explored as an efficient alternative for perovskite fabrication. It possesses the ability to ideally satisfy the all above-mentioned advantages [3],[4]. In this work, two routes have been studied to elaborate the perovskite layer. The first one consist in an immediate conversion of PbO2 into PK1 by immersion in MAI (CH3NH3I) solution and the second route is a two-step conversion: first conversion into PbI2 by immersion of PbO2 in HI, and then immersion of PbI2 in MAI to convert into PK2. For further evaluation of the impact of the conversion route and the substrate nature, a perovskite solar cell has been developed using the electrodeposited active layers. Its structure is the following: an ITO (indium tin oxide) substrate as transparent cathode, a spin coated SnO2 or mesoporous TiO2 ETL (Electron Transport Layer) sub-layer, the electrodeposited CH3NH3PbI3 perovskite layer (PK), a spin coated P3HT HTL layer (Hole Transport Layer) and a carbon paste top-layer as conducting anode. PK1 shows negligible photovoltaic activity whereas PK2 presents favorable results. When changing the ETL from SnO2 to TiO2, a percentage increase from 3% to 8% in terms of efficiency was detected, with the Voc increasing from 0.65 V to 0.87 V and the Jsc from 12 mA/cm2 to 21 mA/cm2. This opens the way to promising performances using electrodeposition.
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International Conference on Hybrid and Organic Photovoltaics
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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