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A surface photovoltaic effect-related high-performance photodetector based on a single CH <sub/>3</sub> NH <sub/>3</sub> PbI <sub/>3</sub> micro/nanowire
摘要： With the decrease of materials to the nanoscale, their surface states will play a crucial role in their performance. Here, an individual CH3NH3PbI3 micro/nanowire-based photodetector can show excellent sensitivity and responsivity to light with a wide wavelength range from 200 to 850 nm. A surface state-related photovoltaic effect associated with a surface barrier can be formed due to a depletion of majority carriers (holes) in the surface space charge region. At a low operation voltage, the photodetector can exhibit a low dark current. Upon illuminating near the end connected to the positive electrode, the light-induced decrease of the surface barrier leads to enhanced conduction, showing a large photocurrent. At zero bias, additionally, the photodetector can show a relatively large photogenerated voltage and current when only the vicinity of one end is illuminated. Based on the CH3NH3PbI3 micro/nanostructure performance herein, surface photovoltaic-controlled photodetectors with superior performance will have important applications in new-generation optoelectronic devices.
关键词： CH3NH3PbI3,optoelectronic devices,photodetector,surface photovoltaic effect,micro/nanowire
更新于2025-09-23 15:19:57
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Inverse Growth of Large Grain Size and Stable Inorganic Perovskite Micro-Nanowire Photodetectors
摘要： Control of the forward and inverse reactions between perovskites and precursor materials is key to attaining high quality perovskite materials. Many techniques focus on synthesizing nanostructured CsPbX3 materials (e.g., nanowires) via a forward reaction (CsX + PbX2 → CsPbX3). However, lower solubility of inorganic perovskites and complex phase transition make it difficult to realize the precise control of composition and the length of nanowires using the conventional forward approach. Herein, we report a self-assembly inverse growth of CsPbBr3 micro-nanowires (MWs) (CsPb2Br5 → CsPbBr3 + PbBr2 ↑) by controlling phase transition from CsPb2Br5 to CsPbBr3. Two-dimensional (2D) structure of CsPb2Br5 serves as nucleation sites to induce the initial CsPbBr3 MW growth. Also, phase transition allows crystal rearrangement and slows down the crystal growth, which facilitates the MW growth of CsPbBr3 crystals along the 2D planes of CsPb2Br5. A CsPbBr3 MW photodetector constructed based on the inverse growth shows a high responsivity of 6.44 A W-1 and detectivity of ~1012 Jones. Larger grain size, high crystallinity and bigger thickness can effectively alleviate the decomposition/degradation of perovskites, which leads to storage stability over 60 days in moisture (45% relative humidity) and operational stability over 3000 min under illumination (400 nm, ~20.06 mW cm-2).
关键词： inverse growth,photodetector,operational stability,inorganic perovskite,micro-nanowire
更新于2025-09-19 17:13:59