三角形金字塔MAPbBr <sub>3</sub>单晶的设计生长及其在（100）和（111）面之间的光电各向异性,The Journal of Physical Chemistry C

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三角形金字塔MAPbBr ₃单晶的设计生长及其在（100）和（111）面之间的光电各向异性
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-04-22 , DOI: 10.1021/acs.jpcc.9b02045
Lin Jing ₁ , Xiaohua Cheng ₁ , Ye Yuan ₁ , Songjie Du ₁ , Jianxu Ding ₁ , Haiqing Sun ₁ , Xiaoyuan Zhan ₁ , Tianliang Zhou ₂

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CH ₃ NH ₃ PbBr ₃（MAPbBr ₃）是有机-无机杂化钙钛矿家族中的经典成员之一，在高光子吸收效率和长载流子传输距离方面表现出优异的优势，预计它将打破响应性和效率方面的记录。光电探测器，因为单晶优于其薄膜，纳米线和其他同类产品。此外，单晶提供了足够的介质来揭示固有的光电特性，例如与缺陷相关的暗电流，混合离子电导率等。MAPbBr _3中的混合离子电导率单晶被认为与原子堆积密度有关，原子堆积密度被认为是晶体取向的或各向异性的。在这项研究中，通过晶体限制方法成功地生长了暴露（100）和（111）面的一系列大型MAPbBr ₃单晶。通过仅在MAPbBr ₃单晶中用Au叉指电极在（100）和（111）面上制造金属-半导体-金属平面光电探测器，就离子迁移和电流各向异性以及导通各向异性对系统的光电各向异性进行了系统地比较。不合格率。这表明较高的MA ⁺和[PbBr ₆ ] ^4– （111）平面中的密度会导致更高的内置电场，这最终会影响暗电流，光电流和开/关比。

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Design Growth of Triangular Pyramid MAPbBr3 Single Crystal and Its Photoelectric Anisotropy between (100) and (111) Facets

CH₃NH₃PbBr₃ (MAPbBr₃), one of the classical members in the organic–inorganic hybrid perovskite family that presents excellent advantages in high photon absorption efficiency and long carrier transport distance, is expected to break the record in responsiveness and efficiency as a photodetector, because single crystal is superior to its thin films, nanowires, and other counterparts. Moreover, single crystal provides adequate media to reveal the intrinsic photoelectric properties, such as defect-related dark current, mixed-ionic conductivities, etc. The mixed-ionic conductivities in MAPbBr₃ single crystal are considered to be associated with the atomic packing densities, which are deemed as crystalline oriented or anisotropic. In this study, a series of large-sized MAPbBr₃ single crystals with (100) and (111) facets exposed were successfully grown through a crystal-limiting method. By fabricating metal–semiconductor–metal planner photodetectors on both (100) and (111) facets with Au interdigital electrodes in only a MAPbBr₃ single crystal, the photoelectric anisotropy was systematically compared in terms of ion migration and the anisotropy of current and on–off ratios. This reveals that the higher MA⁺ and [PbBr₆]^4– densities in (111) plane cause a higher built-in electric field, which ultimately affects the dark current, photocurrents, and on–off ratios.

更新日期：2019-04-22

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