Effects of Bromide-mixing in Methylammonium Lead Iodide on Photovoltaic Properties of ZnO-based Perovskite Solar Cells

International Conference on Materials Research and Innovation

Khaywimut, C.^1^2 ; Bhoomanee, C.^1^2 ; Choopun, S.^1^2^3 ; Wongratanaphisan, D.^1^2^3 ; Pengpad, A.^4 ; Ruankham, P.^1^2^3

Department of Physics and Material Science, Faculty of Science, Chiang Mai University, Chiang Mai

50200, Thailand^1

Thailand Center of Excellent in Physics (ThEP Center), Commission Higher Education, Bangkok

10400, Thailand^2

Research Center in Physics and Astronomy, Faculty of Science, Chiang Mai University, Chiang Mai

50200, Thailand^3

Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen

40002, Thailand^4

关键词: Absorber layers;    Mixing precursor;    Perovskite crystal;    Perovskite films;    Perovskite layers;    Perovskite structures;    Photovoltaic property;    Sequential deposition;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/526/1/012014/pdf
DOI  :  10.1088/1757-899X/526/1/012014

来源: IOP

【 摘 要 】

To improve efficiency of ZnO-based perovskite solar cells, a mixture iodide-bromide (I-Br) of FA0.4MA0.6Pbl3-2xBr2x perovskite structure was prepared by two-step sequential deposition method and used as photo absorber layer. Solar cells with structure of ITO/ZnO/PCBM/perovskite/P3HT/Au were fabricated and characterized. The perovskite films were prepared by mixing precursor PbI2 and PbBr2 at various molar ratio. It was found that the grain sizes and crystallite sizes of perovskite crystal were comparable for different Br doping. The existence of Br ions in perovskite layer was confirmed. In addition, the increase in band gap energy was observed. The highest average power conversion efficiency (PCE) of 2.17% was achieved from the device with FA0.4MA0.6PbI2.8Br0.2 layer. This PCE value is higher than the FA0.4MA0.6PbI3 device which exhibited 1.53%-efficiency. The enhancement in PCE could be explained by the development of light absorption and charges transport.