Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Publication date: 23rd October 2018
The develpment speed of perovskite solar cells (PSCs) has been accelerated recording 23.7% of power conversion efficiency despite the short history. The efficiency itself meets the need of the commercialization requirements thanks to the efficient fabrication method especially for single cation/halide perovskite such as MAPbI3. However, the biggest concern still remains about whether fabrication of mixed cation/halide perovskites is reproducible. Optical and electrical properties of mixed cation/halide perovskites often show incoherent results even under the precisely controlled environment by regulating humidity and oxygen level. Here, we focused on the perovskite substrates right after anti-solvent dripping, which are commonly believed to be DMSO-related intermediate phases. We found that there are approximately six different states after anti-solvent dripping, one of which any sort of mixed cation/halide perovskite (including single cation/halide) precursor belongs to. We observed that the change of grain sizes and optoelectronic properties of perovskites was conspicuous by evaporation kinetics of DMSO for only two states among six while its effects are marginal for other four states. This phenomenon emphasizes the fact that adequate control of DMSO for mixed cation/halide perovskite precursors with certain compositions is of great importance for further photovoltaic performances to minimize experimental errors. Through the optimization of evaporation kinetics of DMSO, mixed cation/halide perovskite solar cells (PSCs) recorded 21.3% of power conversion efficiency (PCE). Further, certified 18.3% of PCE was also obtained for the planar-typed PSCs with large active area (1 cm2).
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