Qichao Chen,Jiayi Chen,Xiao Xu,Zhehan Wang,Yamei Ding,Le Xiong,Beibei Zhu,Li Tao
Vapor–solid growth (VSG) is a cost-effective technique to synthesize Bi2Se3 materials with promising thermoelectric (TE) performance. In this work, smooth Bi2Se3 thin films with enhanced TE performance have been realized through regulating the carrier gas flow rate during the VSG process. The optimized morphology improves the electrical conductivity and decouples its interplay withthe Seebeck coefficient in Bi2Se3. As a result, our Bi2Se3 synthesized at 150 sccm gas flow rate exhibited a Seebeck coefficient around −100 μV K–1 and a power factor (PF) of 1.59 × 10–3 W m–1 K–2, which is higher than those of existing thin films and the single-crystal bulk form. This work provides guidance for the controllable preparation of Bi2Se3 thin films with low roughness and high TE performance for potential applications in micro-/nanodevices.
Ye Yanhong,Yu Ruiyang,Huang Zongyu,Qiao Hui,Qi Xiang
Two-dimensional (2D) materials have demonstrated great performance and good application prospects in a variety of photodetectors, including photoelectrochemical (PEC)-type photodetectors, due to their superior optical and electrical properties. Among these, 2D Bi 2 Se 3 materials have drawn a lot of attention from scientists due to their special physical characteristics, such as a topological insulator, strong carrier mobility, and narrow bulk bandgap of 0.3 eV. Among the many methods for preparing Bi 2 Se 3 , the electrodeposition method stands out for its high adaptability and compatibility with PEC systems. Herein, through a simple electrodeposition method based on an electrochemical system, a Bi 2 Se 3 film-based PEC-type photodetector was constructed, which exhibits good and tunable photoresponse properties, as well as excellent cycle and time stability. This research demonstrates the potential of the Bi 2 Se 3 film created by electrodeposition as a photoanode material for photodetectors and offers a practical and prolongable method for creating photoanodes for PEC photodetectors.
危险品化学品经营许可证（带存储）