Highly Efficient Full van der Waals 1D p-Te/2D n-Bi2O2Se Heterodiodes with Nanoscale Ultra-Photosensitive Channels

作者：Wang, Weijun; Meng, You; Wang, Wei; Zhang, Zhuomin; Xie, Pengshan; Lai, Zhengxun; Bu, Xiuming; Li, Yezhan; Liu, Chuntai; Yang, Zengbao; Yip, SenPo; Ho, Johnny C.^*

来源：Advanced Functional Materials, 2022, 32(30): 2203003.

DOI：10.1002/adfm.202203003

• heterodiode
• self-powered photodetection
• superlinearity
• Te/Bi2O2Se

Continuous miniaturization of semiconductor devices is the key to boosting modern electronics development. However, this downscaling strategy has been rarely utilized in photoelectronics and photovoltaics. Here, in this work, a full-van der Waals (vdWs) 1D p-Te/2D n-Bi2O2Se heterodiode with a rationally designed nanoscale ultra-photosensitive channel is reported. Enabled by the dangling bond-free mixed-dimensional vdWs integration, the Te/Bi2O2 Se type-II diodes show a high rectification ratio of 3.6 x 10(4). Operating with 100 mV reverse bias or in a self-power mode, the photo-diodes demonstrate excellent photodetection performances, including high responsivities of 130 A W-1 (100 mV bias) and 768.8 mA W-1 (self-power mode), surpassing most of the reports of other heterostructures. More importantly, a superlinear photoelectric conversion phenomenon is uncovered in these nanoscale full-vdWs photodiodes, in which a model based on the in-gap trap-assisted recombination is proposed for this superlinearity. All these results provide valuable insights in light-matter interactions for further performance enhancement of photoelectronic devices.

• 单位
  郑州大学