Abstract
The self-powered and ultra-broadband photodetectors based on photothermoelectric (PTE) effect are promising for diverse applications such as sensing, environmental monitoring, night vision and astronomy. The sensitivity of PTE photodetectors is determined by the Seebeck coefficient and the rising temperature under illumination. Previous PTE photodetectors mostly rely on traditional thermoelectric materials with Seebeck coefficients in the range of 100 μV K−1, and array structures with multiple units are usually employed to enhance the photodetection performance. Herein, we demonstrate a reduced SrTiO3 (r-STO) based PTE photodetector with sensitivity up to 1.2 V W−1 and broadband spectral response from 325 nm to 10.67 μm. The high performance of r-STO PTE photodetector is attributed to its intrinsic high Seebeck coefficient and phonon-enhanced photoresponse in the long wavelength infrared region. Our results open up a new avenue towards searching for novel PTE materials beyond traditional thermoelectric materials for low-cost and high-performance photodetector at room temperature.
Highlights
The self-powered and ultra-broadband photodetectors based on photothermoelectric (PTE) effect are promising for diverse applications such as sensing, environmental monitoring, night vision and astronomy
Considering these two properties, excellent long-wavelength infrared (LWIR) photodetection performance can be expected in STO-based PTE photodetector
We demonstrate the ultra-broadband response of reduced STO (SrTiO3-δ, reduced SrTiO3 (r-STO)) single crystal from 325 nm to 10.67 μm driven by the PTE effect
Summary
The self-powered and ultra-broadband photodetectors based on photothermoelectric (PTE) effect are promising for diverse applications such as sensing, environmental monitoring, night vision and astronomy. In PTE effect, the responsivity is related to the light-induced temperature gradient and the material’s Seebeck coefficient. Due to the saturation effect, the 2D material-based PTE photodetectors usually can only be used to detect low-power light[8,11,13].
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