Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.138
Publication date: 7th February 2022
Perovskite solar cells are still improving their high performance in J-V characteristics in various compositions of perovskites including all inorganic materials. The most important element in the J-V performance is open-circuit voltage (Voc) which reflects suppression of charge recombination losses at the interfaces. We achieved high levels of Voc for all inorganic CsPbI2Br (bandgap 1.9eV) with 1.42 V 1 and for mixed cation Cs-FA-MAPb(I,Br)3 perovskite cells (bandgap 1.51eV) with 1.19V.2 The CsPbI2Br device was fabricated by using amorphous SnOx layer that passivate the perovskite and meso-SnO2 interface, and enables Voc exceeding 1.1V even under week indoor illumination (200 lx) with power conversion efficiency (PCE) >34%. The mixed cation perovskite cells, working with conversion efficiency >22%, shows Voc close to its SQ limit (ca.1.21V) as a result of interfacial modification with phenyethylamine bromide as a dipole-inducing layer. 2 These works show that the successful passivation of the junction interfaces is essential for improving Voc toward application of perovskite photovoltaic cells to circumstances of large light intensity variation. Technologies based on interfacial molecular engineering are expected to improve the device performance of lightweight flexible plastic devices. We employed an organic peroxide, artemisinin (water-insoluble anti-malarial drug), to modify the interface of SnO2 ETL and multi-cation perovskite (Rb-Cs-FA-MA)Pb(I,Br)3).3 This redox-active molecule is considered to interreact with the oxide surface and lead cation. The artemisinin-based passivation was applied to the SnO2-perovskite interface of a plastic film flexible device. The device showed decreased hygroscopicity due to the effect of artemisinin, leading to an increase in shelf life. Its effects of enhancing Voc improved the device efficiency up to 21%. Organic passivators should be chemically and thermally stable non-ionic materials and inactive against their diffusion. Our challenges to design durable passivation materials for Voc improvement are underway.
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