Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV24)
DOI: https://doi.org/10.29363/nanoge.hopv.2024.028
Publication date: 6th February 2024
Electrodeposition was investigated in this work as a substitute method to develop large area perovskite active layers for perovskite solar cells application. In order to make perovskite solar cells, a metal or metal oxide, usually a lead compound (Pb, PbO, PbO2,…), is electroplated and used as the basis for the perovskite. The electrodeposition process of PbO2 together with the following conversion steps used in this work are shown on the Figure.
This innovative perovskite deposition process could pave the way for the industrialization and marketing of perovskite solar cells architecture. Indeed, it is a low-cost process, leading to smooth & uniform layers, over large areas. In addition, it is produced under ambient conditions (with no need of glove box), and is environmentally friendly in terms of solvent engineering, since no toxic solvents are needed to stabilize or improve the morphology of the layers obtained. The present study looks at the influence of 5-AVAI (AVAI = ammonium valeric acid iodide) in the fabrication of traditional MAPbI3 perovskite. Several studies have already shown that the addition of this additive improves the stability and performance of perovskite solar cells produced by spin coating or drop casting. However, in the literature, the effect of 5-AVAI has never been studied on cells produced by electrodeposition. The present study therefore involved varying the ratios of MAI: AVAI in the conversion bath in order to study the effect of this additive on devices realized by electrodeposition. It was noticed that according to MAI:AVAI ratios infiltrated in the perovskite lattice, different microstructures, optical and chemical properties are obtained. The perovskites obtained thus have different bandgap energies, crystallinity rates and stabilities. A correlation will thus be established with the photovoltaic performance of electrodeposited photovoltaic devices varying with the amount of 5-AVAI. In addition, it was shown that for a certain quantity of 5-AVAI, the cells showed a 65% enhancement in PCE after 150h of post treatment at 40°C, under vacuum.
The authors thank the I-MEP2 doctoral school for the MESR PhD grant (R.L) attribution, the University Savoie Mont Blanc for the financial support through AAP, and the platform of Consortium des Moyens Technologiques Communs (CMTC) of Grenoble INP for laboratory assistance and laboratory equipment. This work has been supported by the French National Research Agency, through Investments for Future Program (ref. ANR-18-EURE-0016 – Solar Academy).
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