title: Power Conversion Efficiency and Device Stability Improvement of Inverted Perovskite Solar Cells by Using a ZnO:PFN Composite Cathode Buffer Layer.
abstract: We have demonstrated in this article that both power conversion efficiency (PCE) and performance stability of inverted planar heterojunction perovskite solar cells can be improved by using a ZnO:PFN nanocomposite (PFN: poly[(9,9-bis(3'-(N,N-dimethylamion)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctyl)-fluorene]) as the cathode buffer layer (CBL). This nanocomposite could form a compact and defect-less CBL film on the perovskite/PC61BM surface (PC61BM: phenyl-C61-butyric acid methyl ester). In addition, the high conductivity of the nanocomposite layer makes it works well at a layer thickness of 150 nm. Both advantages of the composite layer are helpful in reducing interface charge recombination and improving device performance. The power conversion efficiency (PCE) of the best ZnO:PFN CBL based device was measured to be 12.76%, which is higher than that of device without CBL (9.00%), or device with ZnO (7.93%) or PFN (11.30%) as the cathode buffer layer. In addition, the long-term stability is improved by using ZnO:PFN composite cathode buffer layer when compare to that of the reference cells. Almost no degradation of open circuit voltage (VOC) and fill factor (FF) was found for the device having ZnO:PFN, suggesting that ZnO:PFN is able to stabilize the interface property and consequently improve the solar cell performance stability.
authors.affiliation: Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education , Taiyuan 030024, P. R. China.|Printable Electronics Research Center, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS) , Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou 215123, P. R. China.
authors.forename: Xiaorui
authors.initials: X
authors.lastname: Jia
authors.affiliation: Printable Electronics Research Center, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS) , Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou 215123, P. R. China.
authors.forename: Lianping
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Printable Electronics Research Center, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS) , Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou 215123, P. R. China.
authors.forename: Qun
authors.initials: Q
authors.lastname: Luo
authors.affiliation: Printable Electronics Research Center, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS) , Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou 215123, P. R. China.
authors.forename: Hui
authors.initials: H
authors.lastname: Lu
authors.affiliation: Printable Electronics Research Center, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS) , Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou 215123, P. R. China.
authors.forename: Xueyuan
authors.initials: X
authors.lastname: Li
authors.affiliation: Institute of Functional Nano & Soft Materials, Soochow University , Suzhou 215123, P. R. China.
authors.forename: Zhongzhi
authors.initials: Z
authors.lastname: Xie
authors.affiliation: Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education , Taiyuan 030024, P. R. China.
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Institute of Functional Nano & Soft Materials, Soochow University , Suzhou 215123, P. R. China.
authors.forename: Yan-Qing
authors.initials: YQ
authors.lastname: Li
authors.affiliation: Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education , Taiyuan 030024, P. R. China.
authors.forename: Xuguang
authors.initials: X
authors.lastname: Liu
authors.affiliation: Printable Electronics Research Center, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS) , Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou 215123, P. R. China.
authors.forename: Chang-Qi
authors.initials: CQ
authors.lastname: Ma
keywords: ZnO:PFN nanocomposites; cathode buffer layer; enhanced power conversion efficiency; inverted perovskite solar cell; stability improvement