Surface Energy-Mediated Self-Catalyzed CsPbBr3 Nanowires for Phototransistors

Authors：Li, Dengji; Meng, You; Zheng, Yini; Xie, Pengshan; Kang, Xiaolin; Lai, Zhengxun; Bu, Xiuming; Wang, Wei; Wang, Weijun; Chen, Furong; Liu, Chuntai; Lan, Changyong; Yip, SenPo; Ho, Johnny C.^*

Source：Advanced Electronic Materials, 2022, 8(12): 2200727.

DOI：10.1002/aelm.202200727

• all-inorganic perovskites
• nanowires
• photodetectors
• phototransistors
• self-catalyzed growth

Controllable self-catalyzed growth of semiconductor nanowires (NWs) is of great importance, particularly to avoid impurities coming from foreign catalysts to deteriorate the NW properties. Although this catalyst-free NW growth has many obvious advantages, there are very limited works focused on all-inorganic CsPbBr3 perovskite NWs, which is one of the recent champion materials for electronics and optoelectronics. Here, a direct self-catalyzed synthesis of freestanding CsPbBr3 NWs via vapor-liquid-solid growth mechanism by chemical vapor deposition is developed. Notably, mainipulation of the substrate surface roughness is the key enabling parameter for the self-catalyzed NW growth here. It is revealed that the surface energy of substrates, modulated by its surface roughness, is found to effectively mediate the self-catalytic growth of CsPbBr3 NWs. When configured into photodetectors, the intrinsic p-type CsPbBr3 NWs exhibit good optoelectronic performance with a photoresponivity of approximate to 2000 A W-1, a detectivity of approximate to 2.57 x 10(12) Jones, and a fast response down to 362 mu s. All these results evidently indicate the technological potential of this self-catalyzed synthesizing route for other high-quality all-inorganic perovskite NWs.

• Institution
  郑州大学; 电子科技大学