Enhanced Crystal Quality of Perovskite via Protonated Graphitic Carbon Nitride Added in Carbon-Based Perovskite Solar Cells  

掺杂质子化石墨相氮化碳增强碳基太阳能电池中钙钛矿的结晶质量

作　　者：Mingxing Guo Wenchao Liu Junyan Huang Jiaqi Liu Shuhui Yin Jing Leng 郭明星;刘文超;黄均妍;刘佳琦;尹淑慧;冷静(大连海事大学环境科学与工程学院,大连116026;大连海事大学理学院,大连116026;中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连116023)

机构地区：[1]College of Environment Science and Engineering,Dalian Maritime University,Dalian 116026,China [2]College of Science,Dalian Maritime University,Dalian 116026,China [3]The State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116026,China

出　　处：《Chinese Journal of Chemical Physics》2022年第2期390-398,I0004,共10页化学物理学报（英文）

基　　金：supported by the Natural Science Foundation of Liaoning Province(No.20170540086);the Open Fund of the State Key Laboratory of Molecular Reaction Dynamics in Dalian Institute of Chemical Physics,Chinese Academy of Sciences(SKLMRD-K202107,K202216)。

摘　　要：The quality of perovskite layers has a great impact on the performance of perovskite solar cells(PSCs).However,defects and related trap sites are generated inevitably in the solutionprocessed 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 environmental friendly 2D nanomaterial protonated graphitic carbon nitride(p-g-C_(3)N_(4))was successfully synthesized and doped into perovskite layer of carbon-based PSCs.The addition of p-g-C_(3)N_(4)into perovskite precursor solution not only adjusts nucleation and growth rate of methylammonium lead tri-iodide(MAPb I3)crystal for obtaining flat perovskite surface with larger grain size,but also reduces intrinsic defects of perovskite layer.It is found that thep-g-C_(3)N_(4) locates at the perovskite core,and the active groups-NH_(2)/NH_(3)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-C_(3)N_(4)(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.

关 键 词：Perovskite solar cell Carbon counter electrode p-g-C3N4 Crystal quality Photoelectric performance 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]