title: Highly efficient electron transport obtained by doping PCBM with graphdiyne in planar-heterojunction perovskite solar cells.
abstract: Organic-inorganic perovskite solar cells have recently emerged at the forefront of photovoltaics research. Here, for the first time, graphdiyne (GD), a novel two dimension carbon material, is doped into PCBM layer of perovskite solar cell with an inverted structure (ITO/PEDOT:PSS/CH3NH3PbI(3-x)Cl(x)/PCBM:GD/C60/Al) to improve the electron transport. The optimized PCE of 14.8% was achieved. Also, an average power conversion efficiency (PCE) of PCBM:GD-based devices was observed with 28.7% enhancement (13.9% vs 10.8%) compared to that of pure PCBM-based ones. According to scanning electron microscopy, conductive atomic force microscopy, space charge limited current, and photoluminescence quenching measurements, the enhanced current density and fill factor of PCBM:GD-based devices were ascribed to the better coverage on the perovskite layer, improved electrical conductivity, strong electron mobility, and efficient charge extraction. Small hysteresis and stable power output under working condition (14.4%) have also been demonstrated for PCBM:GD based devices. The enhanced device performances indicated the improvement of film conductivity and interfacial coverage based on GD doping which brought the high PCE of the devices and the data repeatability. In this work, GD demonstrates its great potential for applications in photovoltaic field owing to its networks with delocalized π-systems and unique conductivity advantage.
authors: †Institute of New Energy Technology, Ningbo Institute of Material Technology and Engineering (NIMTE), Chinese Academy of Science (CAS), Ningbo, 315201, Peoples Republic of China.|§College of Science, Shantou University, Shantou, 515063, Peoples Republic of China.
authors: Chaoyang
authors: C
authors: Kuang
authors: †Institute of New Energy Technology, Ningbo Institute of Material Technology and Engineering (NIMTE), Chinese Academy of Science (CAS), Ningbo, 315201, Peoples Republic of China.|§College of Science, Shantou University, Shantou, 515063, Peoples Republic of China.
authors: Gang
authors: G
authors: Tang
authors: †Institute of New Energy Technology, Ningbo Institute of Material Technology and Engineering (NIMTE), Chinese Academy of Science (CAS), Ningbo, 315201, Peoples Republic of China.
authors: Tonggang
authors: T
authors: Jiu
authors: ‡CAS Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, Peoples Republic of China.
authors: Hui
authors: H
authors: Yang
authors: ‡CAS Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, Peoples Republic of China.
authors: Huibiao
authors: H
authors: Liu
authors: †Institute of New Energy Technology, Ningbo Institute of Material Technology and Engineering (NIMTE), Chinese Academy of Science (CAS), Ningbo, 315201, Peoples Republic of China.
authors: Bairu
authors: B
authors: Li
authors: †Institute of New Energy Technology, Ningbo Institute of Material Technology and Engineering (NIMTE), Chinese Academy of Science (CAS), Ningbo, 315201, Peoples Republic of China.
authors: Weining
authors: W
authors: Luo
authors: †Institute of New Energy Technology, Ningbo Institute of Material Technology and Engineering (NIMTE), Chinese Academy of Science (CAS), Ningbo, 315201, Peoples Republic of China.
authors: Xiaodong
authors: X
authors: Li
authors: †Institute of New Energy Technology, Ningbo Institute of Material Technology and Engineering (NIMTE), Chinese Academy of Science (CAS), Ningbo, 315201, Peoples Republic of China.
authors: Wenjun
authors: W
authors: Zhang
authors: §College of Science, Shantou University, Shantou, 515063, Peoples Republic of China.
authors: Fushen
authors: F
authors: Lu
authors: †Institute of New Energy Technology, Ningbo Institute of Material Technology and Engineering (NIMTE), Chinese Academy of Science (CAS), Ningbo, 315201, Peoples Republic of China.
authors: Junfeng
authors: J
authors: Fang
authors: ‡CAS Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, Peoples Republic of China.
authors: Yuliang
authors: Y
authors: Li
keywords: Graphdiyne doping; PCBM; electrical conductivity; interfacial coverage; perovskite solar cell