title: Perovskite CH3NH3PbI3-xBrxSingle Crystals with Charge-Carrier Lifetimes Exceeding 260 μs.
abstract: The long carrier lifetimes in perovskite single crystals have drawn significant attention recently on account of their irreplaceable contribution to high-performance photovoltaic (PV) devices. Herein, the optical and optoelectronic properties of CH3NH3PbI3and CH3NH3PbI3-xBrx(with five different contents of Br doped) single crystals were investigated. Notably, a superior carrier lifetime of up to 262 μs was observed in the CH3NH3PbI3-xBrx(I/Br = 10:1 in the precursor) single-crystal PV device under 1 sun illumination, which is two times longer than that in the CH3NH3PbI3single crystal. Further study confirmed that the ultralong carrier lifetime was ascribed to the integrated superiority derived from both the low trap-state density and high charge-injection efficiency of the device interface. On this basis, appropriate incorporation of Br is useful in the design of better PV devices.
authors.affiliation: Key Laboratory of Luminescence and Real-Time Analytical chemistry (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University , Chongqing 400715, China.|State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, China.
authors.forename: Fengying
authors.initials: F
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Mao
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, China.
authors.forename: Ruixia
authors.initials: R
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, China.
authors.forename: Yajuan
authors.initials: Y
authors.lastname: Li
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Xiong
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Key Laboratory of Luminescence and Real-Time Analytical chemistry (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University , Chongqing 400715, China.
authors.forename: Rongxing
authors.identifier: http://orcid.org/0000-0003-3100-2722
authors.initials: R
authors.lastname: He
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, China.
authors.forename: Weiqiao
authors.identifier: http://orcid.org/0000-0002-3671-5951
authors.initials: W
authors.lastname: Deng
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, China.
authors.forename: Keli
authors.identifier: http://orcid.org/0000-0001-9239-1827
authors.initials: K
authors.lastname: Han
keywords: carrier lifetime; charge-injection efficiency; photovoltaic device; single crystal; trap-state density