A Photoferroelectric Perovskite‐Type Organometallic Halide with Exceptional Anisotropy of Bulk Photovoltaic Effects. Issue 22 (18th April 2016)

• Record Type: Journal Article
• Authors: Sun, Zhihua; Liu, Xitao; Khan, Tariq; Ji, Chengmin; Asghar, Muhammad Adnan; Zhao, Sangen; Li, Lina; Hong, Maochun; Luo, Junhua
• Is Part Of: Angewandte Chemie international edition. Volume 55:Issue 22(2016)
• Page Start: 6545
• Page End: 6550
• Publication Date: 2016-04-18
• Subjects: ferroelectric materials -- organometallic halides -- perovskite -- photovoltaic effects; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201601933
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Perovskite‐type ferroelectrics composed of organometallic halides are emerging as a promising alternative to conventional photovoltaic devices because of their unique photovoltaic effects (PVEs). A new layered perovskite‐type photoferroelectric, bis(cyclohexylaminium) tetrabromo lead (1 ), is presented. The material exhibits an exceptional anisotropy of bulk PVEs. Upon photoexcitation, superior photovoltaic behaviors are created along its inorganic layers, which are composed of corner‐sharing PbBr6 octahedra. Semiconducting activity with remarkable photoconductivity is achieved in the vertical direction, showing sizeable on/off current ratios (>10 4 ), which compete with the most active photovoltaic material CH3 NH3 PbI3 . In1 the temperature‐dependence of photovoltage coincides fairly well with that of polarization, confirming the dominant role of ferroelectricity in such highly anisotropic PVEs. This finding sheds light on bulk PVEs in ferroelectric materials, and promotes their application in optoelectronic devices. Abstract : Photoferroelectric crystals of a perovskite‐type organometallic halide show highly anisotropic photovoltaic activities, including a large photocurrent and remarkable photoconductivity. The critical contribution of electric polarization is confirmed by temperature‐dependent photovoltage for the first time.