The large energy barrier in hole extraction still remains a great challenge in developing hole transporting layer(HTL)materials for organic solar cells(OSCs).Thus,solution-processed HTL materials with excellent hole collection ability and good compatibility with large-area processing technique are strongly desired for OSCs.Herein,we developed a cost-effective and solution-processed MoO3 HTL for efficient OSCs.By adding a small amount of glucose as reducing reagent into the ammonium molybdate precursor solution,a deeply n-doped MoO3,namely G:Mo,was prepared through the sol-gel method.Compared to pristine MoO3,the conductivity of G:Mo was enhanced by two orders of magnitude,which greatly improved the hole collection ability of the HTL.OSCs with G:Mo can exhibit comparable PCE to the PEDOT:PSS device.Using PBDB-TF:BTP-eC9 as the active layer,a PCE of 17.1％is obtained for the device,which is the highest PCE value for OSC using a solution-processed MoO3 HTL.More importantly,G:Mo is well compatible with the blade-coating processing.The OSC using a blade-coated G:Mo showed almost no PCE loss as com-pared to the device with spin-coated G:Mo HTL.The results from this work indicate that G:Mo is a promising HTL material for the practical production of OSCs.

Qian Kang;Chenyi Yang;Bowei Xu;Jianhui Hou

State Key Laboratory of Polymer Physics and Chemistry,Beijing National Laboratory for Molecular Sciences,Institute of Chemistry Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Chemical Resource Engineering,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China

能源化学

[1]Qian Kang;Chenyi Yang;Bowei Xu;Jianhui Hou-.Facile solution-processed molybdenum oxide as hole transporting material for efficient organic solar cell)[J].能源化学,2022(06):108-114

molybdate

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