Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.483
Publication date: 18th December 2023
Perovskite solar cells (PSC) have experienced a dramatic improvement of power conversion efficiency (PCE) in just one decade, from ~10% to the current 26.1% [1]. The high efficiency and the device manufacturing based on low-cost solution processing, which spares high temperature and vacuum, have attracted the interest of academia and industry and substantial funding from governments and supranational institutions.Generally fabricated on rigid glass, PSC can be also made on flexible foils, achieving record PCE of 24.6% on small area and opening up to a wide range of applications, where heavy and fragile rigid glass would be less suitable: IoT sensors, retrofitting of existing buildings, i.e. building-applied PV, space. Flexible perovskite solar cells (f-PSCs) have been demonstrated on large area substrates, reaching up to 15.5% PCE on 100 cm<sup>2</sup> modules [3], with the perovskite layer only deposited via blade coating and the remaining layers by spin coating.</p> <p>To demonstrate f-PSC on large scale and make the technology appealing to industry, reliable and sustainable fabrication routes, compatible with high throughput roll-to-roll manufacture, must be developed. Thus far, most studies of f-PSCs are focusing on small-scale methods and hazardous solvents such as DMF, NMP, and 2-ME. Here, we present f-PSC with device architecture of PET/ITO/SnO 0.1 FA 0.9Pb(I 0.94 Br 0.06 ) 3 / PTAA/Au, in which both the electron transport layer and the absorber are deposited by air-flow assisted blade coating method on 5×7 cm2 flexible substrates. Notably, the perovskite layer is deposited in ambient air via a double-step method, starting from our previous work[4] and changing solvent system, using a DMF-free solvent system, i.e. DMSO only. By fine-tuning the coating parameters, we obtained promising results in terms of PCE reaching 12.7% for 2.5×2.5 cm 2 cells obtained from cutting large-area substrates. In addition, to demonstrate the scalability of this double-step perovskite deposition method, we successfully deposited films on flexible substrates up to 10×10 cm
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