Recently, researchers from the State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences researcher Hu Weida and Professor Liao Lei from the School of Physics at Wuhan University made progress in the field investigation of enhanced nanowire photodetectors in the field of ferroelectric power. Relevant achievements are "When Nanowires Meet Ultrahigh Ferroelectric Field - High-Performance Full-Depleted Nanowire Photodetectors "in the international publication" Nano Express. "
Semiconductor nanowires have attracted widespread attention due to their excellent optoelectronic properties such as extremely high intrinsic optical gain, multiple light-limiting effects, and one-dimensional quantum confinement effects, and have wide application prospects in room temperature photodetection. However, unavoidable introduction of unintentional doping or defects during the fabrication of nanowires induces high concentration of background charge carriers, leading to high dark current in nanowire photodetectors. Therefore, there is an urgent need to suppress the dark current through the structural design to improve the signal-to-noise ratio of the device so as to improve the detection rate.
The researchers prepared a single nanowire-based side-gate photodetector based on localized ferroelectric field enhancement. The super electrostatic field created by PVDF polarization of ferroelectric material completely depleted Background carriers, significantly inhibit the detector dark current, greatly improving the detector sensitivity. The results show that the nanowire photodetector under the control of ferroelectric materials can achieve highly sensitive photodetection at room temperature visible-near-infrared. In addition, these devices also have low power consumption, weak signal detection, fast response and so on. This work provides a new idea for the study of room temperature high performance nanowire photodetectors.
Structure diagram of ferroelectric local field enhanced nanowire photodetector and dark current suppression
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