title: Vertical phase separation in bulk heterojunction solar cells formed by in situ polymerization of fulleride.
abstract: Vertical phase separation of the donor and the acceptor in organic bulk heterojunction solar cells is crucial to improve the exciton dissociation and charge transport efficiencies. This is because whilst the exciton diffusion length is limited, the organic film must be thick enough to absorb sufficient light. However, it is still a challenge to control the phase separation of a binary blend in a bulk heterojunction device architecture. Here we report the realization of vertical phase separation induced by in situ photo-polymerization of the acrylate-based fulleride. The power conversion efficiency of the devices with vertical phase separation increased by 20%. By optimising the device architecture, the power conversion efficiency of the single junction device reached 8.47%. We believe that in situ photo-polymerization of acrylate-based fulleride is a universal and controllable way to realise vertical phase separation in organic blends.
authors.affiliation: State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China.
authors.forename: Lipei
authors.initials: L
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China.
authors.forename: Xing
authors.initials: X
authors.lastname: Xing
authors.affiliation: State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China.
authors.forename: Lingling
authors.initials: L
authors.lastname: Zheng
authors.affiliation: 1] State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China [2] New Display Device and System Integration Collaborative Innovation Center of the West Coast of the Taiwan Strait, Fuzhou 350002, China.
authors.forename: Zhijian
authors.initials: Z
authors.lastname: Chen
authors.affiliation: 1] State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China [2] New Display Device and System Integration Collaborative Innovation Center of the West Coast of the Taiwan Strait, Fuzhou 350002, China.
authors.forename: Lixin
authors.initials: L
authors.lastname: Xiao
authors.affiliation: 1] State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China [2] New Display Device and System Integration Collaborative Innovation Center of the West Coast of the Taiwan Strait, Fuzhou 350002, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Qu
authors.affiliation: State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China.
authors.forename: Qihuang
authors.initials: Q
authors.lastname: Gong