The quality of perovskite layers has a great im-pact on the performance of perovskite solar cells(PSCs).However,de-fects and related trap sites are generated in-evitably in the solution-processed polycrystalline perovskite films.It is meaningful to reduce and passivate the defect states by incorporating additive into the perovskite layer to improve perovskite crystallization.Here an environ-mental friendly 2D nanomaterial protonated graphitic carbon nitride(p-g-C3N4)was suc-cessfully synthesized and doped into perovskite layer of carbon-based PSCs.The addition of p-g-C3N4 into perovskite precursor solution not only adjusts nucleation and growth rate of methylammonium lead tri-iodide(MAPbI3)crystal for obtaining flat perovskite surface with larger grain size,but also reduces intrinsic defects of perovskite layer.It is found that the p-g-C3N4 locates at the perovskite core,and the active groups-NH2/NH3 and NH have a hydrogen bond strengthening,which effectively passivates electron traps and enhances the crystal quality of perovskite.As a result,a higher power conversion efficiency of 6.61％is achieved,compared with that doped with g-C3N4(5.93％)and undoped one(4.48％).This work demonstrates a simple method to modify the perovskite film by doping new modified additives and develops a low-cost preparation for carbon-based PSCs.

Mingxing Guo;Wenchao Liu;Junyan Huang;Jiaqi Liu;Shuhui Yin;Jing Leng

College of Environment Science and Engineering,Dalian Maritime University,Dalian 116026,China;College of Science,Dalian Maritime University,Dalian 116026,China;The State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116026,China

化学物理学报（英文版）

[1]Mingxing Guo;Wenchao Liu;Junyan Huang;Jiaqi Liu;Shuhui Yin;Jing Leng-.Enhanced Crystal Quality of Perovskite via Protonated Graphitic Carbon Nitride Added in Carbon-Based Perovskite Solar Cells)[J].化学物理学报（英文版）,2022(02):390-398

Protonated,evitably

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