碳电极钙钛矿太阳能电池光吸收层厚度对光伏性能的影响研究

本文使用两步法,通过控制PbI₂(DMSO)溶液的浓度制备了不同厚度的有机-无机杂化钙钛矿(MAPbI₃)光吸收层薄膜,并组装了大面积基于碳电极且无空穴传输层的钙钛矿太阳能电池。对不同厚度MAPbI₃光吸收层薄膜的晶相、光吸收性质、表面形貌、元素组成进行分析,并进一步测试了基于MAPbI₃薄膜制备的钙钛矿太阳能电池的光伏性能。结果表明,MAPbI₃光吸收层薄膜厚度与PbI₂(DMSO)浓度呈正相关关系,浓度为1.3 mol/L的PbI₂溶液制备的MAPbI₃薄膜厚度约为350 nm,具有较好的结晶度和光吸收强度,且薄膜表面致密平整,无明显缺陷,基于350 nm MAPbI₃光吸收层的钙钛矿太阳能电池获得了8.48%的光电转换效率。

Effect of Optical Absorption Layer Thickness on Photovoltaic Performance of Carbon Electrode Perovskite Solar Cells

In this paper, organic-inorganic hybrid perovskite (MAPbI₃) optical absorption layer thin film with different thickness was prepared by controlling the concentration of PbI₂(DMSO) solution by two-step method, and a large area perovskite solar cell based on carbon electrode hole-free transport layer was assembled. The crystal phase, optical absorption properties, surface morphology and elemental composition of MAPbI₃ optical absorption layer films with different thickness were analyzed, and the photovoltaic performance of perovskite solar cells prepared based on MAPbI₃ film were further tested. The results show that the thickness of MAPbI₃ photoabsorption layer is positively correlated with the concentration of PbI₂(DMSO). The thickness of MAPbI₃ optical absorption layer prepared by 1.3 mol/L PbI₂ solution is about 350 nm, which has good crystallinity and optical absorption intensity, and the surface of the film is compact and smooth without obvious defects. Finally, the perovskite solar cell based on 350 nm MAPbI₃ optical absorption layer achieves 8.48% photoelectric conversion efficiency.