Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Publication date: 23rd October 2018
Solution-processed hybrid perovskite solar cells (PSCs) have attracted considerable attention as a promising alternative for solar cells due to their high power conversion efficiencies, easy fabrication, and low cost. Therefore, to achieve the practical use of PSCs, investigations have been conducted from various perspectives.
Recently, the addition of an aliphatic fluorinated additive, 2,2,2-trifluroethyl ammonium iodide (FEAI) in MAPbI3 (MA = CH3NH3+) perovskite was found to enhance the environmental stability of the devices without sacrificing their performance [1]. Moisture resistance is enhanced due to the hydrophobic CF3-terminal group. On the other hand, it has been reported that Br atoms in MAPb(I1-xBrx)3 affect the stability because of the reduction of the lattice constant and transition to a cubic phase [2].
In this study, we newly synthesized 2,2,2-trifluroethyl ammonium bromide (FEABr) as an aliphatic fluorinated additive in MAPbI3 perovskite and compared its effect on the cell performance. The device architecture is as follows: FTO-glass/compact TiO2/mesoporous TiO2/perovskite (MAPbI3)/spiro-MeOTAD/Au. The devices with various blending ratio of FEABr or FEAI such as 0%, 3mol% and 8mol% versus PbI2 as an additive in the precursor solution containing MAI and PbI2 were made with one-step spin coating of precursor solutions on top of mesoporous TiO2. To evaluate the effect of those additives in MAPbI3 perovskite toward moisture, we exposed unencapsulated devices to ambient environments. The use of FEABr as an additive in MAPbI3 perovskite was found to tune the morphology of the bulk perovskite layer and at the same time to increase the environmental stability of the devices. After adding 3% FEABr into the perovskite layer, the solar cell exhibited significantly improved stability compared with the others. This result indicates that FEABr is potentially a good additive in MAPbI3 perovskite film precursor for improving the environmental stability of the devices.
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