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Here,we introduced acetamidine(C_2H_3N_2H_3,Aa)-based salt as an additive in the fabrication of perovskite(CH_3NH_3PW_3)layer for perovskite solar cells.It was found that as an amidine-based salt,this additive successfully enhanced the crystallinity of CH_3NH_3PW_3 and helped to form smooth and uniform films with comparable grain size and full coverage.Besides,perovskite film with additive showed a much longer carrier lifetime and an obviously enhanced open-circuit voltage in the corresponding devices,indicating that the acetamidine-based salt can reduce the carrier recombination in both the film and device.We further demonstrate a promising perovskite device based on acetamidine salt by using a configuration of ITOATiO_2/Perovskite/Spiro-OMeTAD/Au under < 150 ℃ fabrication condition.A power conversion efficiency(PCE)of 16.54%was achieved,which is much higher than the control device without acetamidine salt.These results present a simple method for film quality optimization of perovskite to further improve photovoltaic performances of perovskite solar cells,which may also benefit the exploration of A cation in perovskite materials.
Here, we introduced acetamidine (C_2H_3N_2H_3, Aa) -based salt as an additive in the fabrication of perovskite (CH_3NH_3PW_3) layer for perovskite solar cells. Where was found that as an amidine-based salt, this additive successfully enhanced the crystallinity of CH_3NH_3PW_3 and helped to form smooth and uniform films with comparable grain size and full coverage.Besides, perovskite film with additive showed a much longer carrier lifetime and an obviously enhanced open-circuit voltage in the corresponding devices, indicating that the acetamidine-based salt can reduce the carrier recombination in both the film and device. We further demonstrate a promising perovskite device based on acetamidine salt by using a configuration of ITOATiO 2 / Perovskite / Spiro-OMeTAD / Au under <150 ° C fabrication condition. A power conversion efficiency (PCE) of 16.54 % was achieved, which is much higher than the control device without acetamidine salt. The results now a simple method for film quality optimization of perovs kite to further improve photovoltaic performances of perovskite solar cells, which may also benefit the exploration of A cation in perovskite materials.