Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
Publication date: 20th April 2022
Different techniques are used to synthesize high-efficiency lead halide perovskite solar cells (PSCs) based on α-phase formamidinium lead iodide (FAPbI3)[1,2]. This manuscript reports an easy and fast way to prepare FAPbI3 powders by a microwave (MW)-assisted synthesis and their application in solar cells. The FAPbI3 powders consist of micrometric particles that can be stored for weeks in a closed vial at ambient conditions. This technique presents an enormous potential for upscaling FAPbI3 powders synthesis prerequisite necessary for large scale commercialization. The performance of the presynthesized FAPbI3-based solar cell was compared with that of solar cells fabricated with the conventional procedure from precursors solutions. For solar cells fabricated with the perovskite powder, the maximum PCE was 18.15%, with an VOC=1.07 V, a Jsc=24.28 mA/cm2 and an FF=70%. The presynthesized FAPbI3-based SC was further modified through the addition of methylammonium chloride (MACl). The optical band gap for the presynthesized perovskite shifted from 1.43 eV to 1.55 eV with the MACl addition (30%M), indicating the formation of a mixed methylammonium and formamidinium based perovskite (MAFAPbI3)[3,4]. The addition of MACl led to an increase in the grain size and the disappearance of the δ-phase perovskite.
This work was made possible by the funding of the Ministry of Science and Innovation of Spain under Project STABLE PID2019-107314RB-I00 and the European Research Council (ERC) via Consolidator Grant (724424 - No-LIMIT). And we would like to acknowledgments to COZCyT and the Unidad Acádemica de Ingeniería Eléctrica from the Universidad Autónoma de Zacatecas, México.