2-methoxyethanol as a solvent system for FAPbI3 p-i-n architecture perovskite solar cells
Amit Kumar a, Manuel Kober-Czerny a, Supravat Karak b, Henry Snaith a
a Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, OX1 3PU, United Kingdom
b CES, IIT Delhi, Centre for Energy Studies, Block 5, New Delhi, 110016
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
London, United Kingdom, 2023 June 12th - 14th
Organizers: Tracey Clarke, James Durrant and Trystan Watson
Poster, Amit Kumar, 287
Publication date: 30th March 2023

Laboratory scale power conversion efficiencies (PCE) of ABX3 type perovskite solar cells has increased to over 25%. However, the typical solution-processed method involves spin-cast, antisolvents, or gas quench and uses N,N-Dimethylformamide (DMF) solvent, making it challenging to transfer for scalable fabrication. Here, we optimize a completely antisolvents/gas and DMF free solvent system for FAPbI3 based p-i-n architecture solar cells using 2-methoxyethanol. Incorporating a non-volatile and Pb2+ co-ordinating N-Methylpyrrolidone additive helps in achieving rapid dying while the deposition process at room temperature. In comparison to commonly used Pb2+ co-ordinating agents (such as DMSO or DMPU DMAc), we see no precipitation formation at any concentration. Along with high reproducibility, we recorded the highest PCE of 20.07 % [Jsc=24.19mA.cm2, Voc=1.03V and FF=80.04%] for an area of 25mm2, owing to enhanced photoluminescence quantum efficiencies, compact and pin-hole free morphology, and highly oriented crystal structure. The expansion of this technique to the processing of large areas would be straightforward.

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