title: High-Efficiency Selective Electron Tunnelling in a Heterostructure Photovoltaic Diode.
abstract: A heterostructure photovoltaic diode featuring an all-solid-state TiO2/graphene/dye ternary interface with high-efficiency photogenerated charge separation/transport is described here. Light absorption is accomplished by dye molecules deposited on the outside surface of graphene as photoreceptors to produce photoexcited electron-hole pairs. Unlike conventional photovoltaic conversion, in this heterostructure both photoexcited electrons and holes tunnel along the same direction into graphene, but only electrons display efficient ballistic transport toward the TiO2 transport layer, thus leading to effective photon-to-electricity conversion. On the basis of this ipsilateral selective electron tunnelling (ISET) mechanism, a model monolayer photovoltaic device (PVD) possessing a TiO2/graphene/acridine orange ternary interface showed ∼86.8% interfacial separation/collection efficiency, which guaranteed an ultrahigh absorbed photon-to-current efficiency (APCE, ∼80%). Such an ISET-based PVD may become a fundamental device architecture for photovoltaic solar cells, photoelectric detectors, and other novel optoelectronic applications with obvious advantages, such as high efficiency, easy fabrication, scalability, and universal availability of cost-effective materials.
authors.affiliation: Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
authors.forename: Chuancheng
authors.initials: C
authors.lastname: Jia
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.|Collaborative Innovation Center of Quantum Matter , Beijing, 100190, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Ma
authors.affiliation: Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
authors.forename: Chunhui
authors.initials: C
authors.lastname: Gu
authors.affiliation: Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
authors.forename: Hongliang
authors.initials: H
authors.lastname: Chen
authors.affiliation: Department of Physics, Fudan University , Shanghai 200433, China.
authors.forename: Haomiao
authors.initials: H
authors.lastname: Yu
authors.affiliation: Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
authors.forename: Xinxi
authors.initials: X
authors.lastname: Li
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.|Collaborative Innovation Center of Quantum Matter , Beijing, 100190, China.
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.|Collaborative Innovation Center of Quantum Matter , Beijing, 100190, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Gu
authors.affiliation: Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Andong
authors.initials: A
authors.lastname: Xia
authors.affiliation: Department of Physics, Fudan University , Shanghai 200433, China.
authors.forename: Xiaoyuan
authors.initials: X
authors.lastname: Hou
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.|Collaborative Innovation Center of Quantum Matter , Beijing, 100190, China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Meng
authors.affiliation: Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.|Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 100871, China.
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Guo
keywords: Graphene; electron tunnelling; interface; photovoltaics