采用热基底喷涂法分别制备了FA0.85MA0.15PbI3和(FAPbI3)0.85(MAPbBr3)0.15两种混合阳离子钙钛矿薄膜,对两种薄膜进行了扫描电镜（SEM）、X-射线衍射（XRD）、紫外-可见光吸收光谱（UV-Vis）测试表征。结果表明,该方法制备的混合阳离子钙钛矿薄膜平整致密,FA0.85MA0.15PbI3结晶性更好,并且吸收带边和吸收强度更大。将两种薄膜组装成平板太阳能电池,对电池的光电性能和稳定性进行了分析。结果表明,FA0.85MA0.15PbI3 PSCs光电转换效率为13.21%,(FAPbI3)0.85(MAPbBr3)0.15 PSCs光电转换效率为12.08%,并且(FAPbI3)0.85(MAPbBr3)0.15 PSCs在放置80 d后,性能基本无变化,表明喷涂法制备(FAPbI3)0.85(MAPbBr3)0.15 PSCs具有较好的稳定性。
In this work, FA0.85MA0.15PbI3 and (FAPbI3)0.85(MAPbBr3)0.15 mixed cation perovskite films were prepared via spray deposition method. Properties of these two films were characterized by emission scanning electron microscope (SEM), X-ray diffraction (XRD) and UV visible light absorption spectroscopy (UV-Vis). Results showed that films prepared by spray deposition were uniform and dense. Compared with FA0.85MA0.15PbI3, the crystallinity of FA0.85MA0.15PbI3 perovskite films was higher, and its light absorption property was more superior. The fabricated planar solar cells can achieved a power conversion efficiency (PCE) of 13.21% with FA0.85MA0.15PbI3 perovskite layer, and 12.08% with (FAPbI3)0.85(MAPbBr3)0.15 perovskite layer. The PCE of (FAPbI3)0.85(MAPbBr3)0.15 PSCs was nearly unchanged after 80 days, which was much more stable than FA0.85MA0.15PbI3 PSCs.
[1] WEBER D.CH3NH3PbX3, a Pb (II)-system with cubic perovskite structure[J]. Zeitschrift für naturforschung B, 1978, 33(12): 1443-1445. DOI: 10.1515/znb-1978-1214.
[2] KOJIMA A, TESHIMA K, SHIRAI Y, et al.Organometal halide perovskites as visible-light sensitizers for photovoltaic cells[J]. Journal of the American chemical society, 2009, 131(17): 6050-6051. DOI: 10.1021/ja809598r.
[3] BAIKIE T, FANG Y N, KADRO J M, et al.Synthesis and crystal chemistry of the hybrid perovskite (CH3NH3)PbI3 for solid-state sensitised solar cell applications[J]. Journal of materials chemistry A, 2013, 1(18): 5628-5641. DOI: 10.1039/C3TA10518K.
[4] PELLET N, GAO P, GREGORI G, et al.Mixed-organic- cation perovskite photovoltaics for enhanced solar-light harvesting[J]. Angewandte chemie, 2014, 53(12): 3151-3157. DOI: 10.1002/anie.201309361.
[5] BI D Q, YI C Y, LUO J S, et al.Polymer-templated nucleation and crystal growth of perovskite films for solar cells with efficiency greater than 21%[J]. Nature energy, 2016, 1(10): 16142. DOI: 10.1038/nenergy.2016.142.
[6] XIAO Z G, BI C, SHAO Y C, et al.Efficient, high yield perovskite photovoltaic devices grown by interdiffusion of solution-processed precursor stacking layers[J]. Energy & environmental science, 2014, 7(8): 2619-2623. DOI: 10.1039/C4EE01138D.
[7] BARROWS A T, PEARSON A J, KWAK C K, et al.Efficient planar heterojunction mixed-halide perovskite solar cells deposited via spray-deposition[J]. Energy & environmental science, 2014, 7(9): 2944-2950. DOI: 10.1039/C4EE01546K.
[8] KIM J H, WILLIAMS S T, CHO N, et al.Enhanced environmental stability of planar heterojunction perovskite solar cells based on blade-coating[J]. Advanced energy materials, 2015, 5(4): 1401229. DOI: 10.1002/aenm. 201401229.
[9] VAK D, HWANG K, FAULKS A, et al.3D printer based slot-die coater as a lab-to-fab translation tool for solution-processed solar cells[J]. Advanced energy materials, 2015, 5(4): 141539. DOI: 10.1002/aenm.201401539.
[10] LIANG Z R, ZHANG S H, XU X Q, et al.A large grain size perovskite thin film with a dense structure for planar heterojunction solar cells via spray deposition under ambient conditions[J]. RSC advances, 2015, 5(74): 60562-60569. DOI: 10.1039/C5RA09110A.
[11] BI Z N, LIANG Z R, XU X Q, et al.Fast preparation of uniform large grain size perovskite thin film in air condition via spray deposition method for high efficient planar solar cells[J]. Solar energy materials and solar cells, 2017, 162: 13-20. DOI: 10.1016/j.solmat.2016.12.032.
[12] YE J J, ZHENG H Y, ZHU L Z, et al.High-temperature shaping perovskite film crystallization for solar cell fast preparation[J]. Solar energy materials and solar cells, 2017, 160: 60-66. DOI: 10.1016/j.solmat.2016.10.022.
[13] 吴亚美, 杨瑞霞, 田汉民, 等. 退火温度对CH3NH3PbI3钙钛矿薄膜结构和电学特性的影响[J]. 功能材料, 2016, 47(7): 7192-7196. DOI: 10.3969/j.issn.1001-9731.2016. 07.037.
