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RESEARCH PRODUCT

Vacuum-Deposited Microcavity Perovskite Photovoltaic Devices

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description

The interaction between semiconductor materials and electromagnetic fields resonating in microcavities or the light-matter coupling is of both fundamental and practical significance for improving the performance of various photonic technologies. The demonstration of light-matter coupling effects in the emerging perovskite-based optoelectronic devices via optical pumping and electrical readout (e.g., photovoltaics) and vice versa (e.g., light-emitting diodes), however, is still scarce. Here, we demonstrate the microcavity formation in vacuum-deposited methylammonium lead iodide (CH3NH3PbI3, MAPI) p-i-n photovoltaic devices fabricated between two reflecting silver electrodes. We tune the position of the microcavity mode across MAPI's absorption edge and study the effect on the microcavity absorption enhancement. Tuning the microcavity mode toward lower energies enhances the absorption of the lower energy photons and steepens the absorption onset which reduces the effective optical gap (E-g) of the devices. This leads to a reduction in the open circuit voltage deficit. The research leading to these results has received funding from the Spanish Ministry of Science, Innovation and Universities (MICIU, RTI2018-095362-A-I00, PCI2019-111829-2, CEX2019-000919-M, and EQC2018-004888-P) and the Comunitat Valenciana (IDIFEDER/2018/061 and PROMETEU/2020/077). C.D. acknowledges that the project that gave rise to these results received the support of a fellowship from “la Caixa” Foundation (ID 100010434, code LCF/BQ/ DI19/11730020). M.S. acknowledges the MICIU for his RyC contract. A.P. acknowledges his Grisolia Grant from the Comunitat Valenciana GRISOLIAP/2020/134.