Wu Yongzhen and Zhu Weihong of East China University of science and technology report the new development of perovskite solar cells in advanced functional materials

Perovskite solar cell is one of the hot topics in the field of energy research The highest photoelectric conversion efficiency of small area devices in the laboratory has reached 25.2% In order to realize commercial application, the stability and large area fabrication of perovskite battery need to be solved Recently, the research group of Professor Wu Yongzhen and Professor Zhu Weihong of East China University of science and technology has made new progress in the preparation of large area hole extraction layer of perovskite battery Relevant work was published in advanced functional materials (DOI: 10.1002 / ADFM 201909509) under the title of "collaborative assembly of highly wettable and uniform hole extraction monolayers for scaling up perovskite solar cells" The organic charge transfer layer has the advantages of low temperature solution preparation and flexible devices However, there are some problems in the preparation of organic charge transfer layer, such as spin coating and evaporation, such as low utilization of materials, uneven film preparation in large area and so on In addition, the surface of organic films has strong hydrophobicity, which makes the preparation of perovskite films difficult In this work, a novel molecular anchoring coassembly (ACA) strategy was proposed to design and synthesize hole transport molecules (HTMs) tpa-pt-c6 and hydrophilic ammonium salt CA br with adsorption groups, which were co assembled on ITO electrode to prepare hole transport monolayers with high wetting uniformity The introduction of Ca br can not only adjust the surface energy of hole extraction layer, increase the wettability of perovskite precursor, improve the morphology and quality of perovskite film, but also effectively passivate the interface cation vacancy defects The large area (1.02 cm-2) and module cell (36 cm-2) of p-i-n type based on the hole transport layer achieved 17.49% and 12.67% photoelectric conversion efficiency, respectively The research was conducted by Li Erpeng, a doctoral student, under the guidance of Professor Wu Yongzhen and Professor Zhu Weihong In addition, I would like to thank Professor Han Liyuan's team of Shanghai Jiaotong University for their help in module battery production The research was carefully guided by academician Tian He and supported by NSFC, Shanghai Science and technology major project, Shanghai Science and technology international cooperation and Shanghai University Distinguished Professor (Oriental scholar) and other projects.