Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
Publication date: 22nd December 2022
Fully evaporated solar cells having methylammonium iodide (MAI) based perovskites can reach power conversion efficiencies exceeding 20%; however, the sublimation control of organic ammonium halides is critical in achieving reproducible perovskite films, in particular due to unreliable monitoring of the evaporation using a quartz crystal microbalance (QCM), and to the presence of certain impurities that can affect the MAI vapor pressure. In this presentation, we will show an evaporator chamber setup for the reproducible coevaporation of PbI2 and MAI, consisted of only two QCMs, one for detecting the precursor PbI2 exclusively (PbI2-QCM) and another located at the same height as the substrates that monitors the total amount of MAPbI3 mass reaching on the substrates (MAPbI3-QCM). Through film and device characterizations, we will show that the MAI evaporation can be reliably monitored indirectly thought the MAPbI3-QCM, avoiding the uncertain rate feedback control usually observed for MAI due to batch-to-batch variations in purity. This allowed us to obtain consistently high performing solar cells over a period of one and a half years.
K.P.S.Z gratefully acknowledge support by the Ministry of Science and Innovation (MCIN) throught a Juan de la Cierva scholarship (IJC2020-045130-I).
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