Professor Wu Yongzhen and Professor Zhu Weihong of East China University of Science and Technology have made new progress in the preparation of large-area hole extraction layers for perovskite batteries. Related research results were recently published in "Advanced Functional Materials".
Perovskite solar cells are currently one of the frontier and hot topics in the field of energy research. The highest photoelectric conversion efficiency of small-area devices in their laboratories has reached 25.2%. In order to realize commercial application, it is also necessary to solve the problems of the stability and large-scale production of perovskite batteries.
To this end, researchers at East China University of Science and Technology innovatively proposed a molecular anchoring co-assembly strategy, designed and synthesized a hole-transporting molecule TPA-PT-C6 containing an adsorption group and a hydrophilic ammonium salt CA-Br, and co-assembled it on ITO On the electrode, a hole-transporting monolayer with high infiltration uniformity is prepared. The introduction of CA-Br can not only adjust the surface energy of the hole extraction layer, increase the wettability of the perovskite precursor, improve the morphology and quality of the perovskite film, but also effectively passivate the interface cation vacancy defects. The pin-type large-area perovskite battery and the module battery based on the hole transport layer obtained photoelectric conversion efficiencies of 17.49% and 12.67%, respectively. (Reporter Huang Xin)
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