Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
We use ultrasonic spray-coating to sequentially deposit thin films of tin oxide, a triple-cation perovskite and spiro-OMeTAD, allowing us fabricate perovskite solar cells (PSCs) with a champion reverse scan power conversion efficiency (PCE) of 19.4% on small-area substrates. We show that the use of spray-deposition permits us to rapidly (>80 mm s-1) coat 25 mm × 75 mm substrates that were divided into a series of devices each with an active area of 15.4 mm2, yielding an average PCE of 10.3% and a peak PCE of 16.3%. By connecting seven 15.4 mm2 devices in parallel on a single substrate, we create a device having an effective active area of 1.08 cm2 and a PCE of 12.7%. This work demonstrates the possibility for spray-coating to fabricate high efficiency and low-cost perovskite solar cells at speed.
This work was funded by the UK Engineering and Physical Sciences Research Council (EPSRC) via grants EP/M025020/1 “High resolution mapping of performance and degradation mechanisms in printable photovoltaic devices”, EP/M014797/1 “Improved Understanding, Development and Optimization of Perovskite-based Solar Cells” and EP/S009213/1 “The integration of photovoltaic devices with carbon-fibre composites”. We also thank the following agencies for funding PhD studentships: University of Sheffield Faculty of Science (C.D.R.), EPSRC DTG account (J.E.B.), EPSRC Centre for Doctoral Training in New and Sustainable PV, EP/L01551X/1 (J.A.S.).
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