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Blackbody‐Sensitive Uncooled Infrared Detector with Ultra‐Broadband and Ultrafast Photoresponse Based on Te/WTe2 Heterostructure.
- Source :
- Advanced Optical Materials; 9/3/2024, Vol. 12 Issue 25, p1-10, 10p
- Publication Year :
- 2024
-
Abstract
- Blackbody‐sensitive uncooled infrared photodetectors with ultra‐broadband and ultrafast photoresponse have a profound impact on many areas of modern science and technology. However, it is a big challenge for both traditional photodetectors and emerging low‐dimensional ones to simultaneously have all the above characteristics. Here, this challenge is addressed by establishing a Te/WTe2 heterostructure photodetector. The built‐in field of the heterostructure and the crossing conduction and valence bands of WTe2 jointly result in a high responsivity and a visible‐to‐long‐wavelength‐infrared photoresponse range. The peak responsivity (at the 3.3 µm wavelength) reaches 914 mA W−1 at zero bias and 8.51 A W−1 at 2 V bias. Further, the joint action coupled with the high mobility of Te and WTe2 promotes the 3‐dB bandwidth to 153 kHz. The self‐powered blackbody responsivity and specific detectivity reach 235.7 mA W−1 and 1.1 × 108 cm Hz1/2 W−1, respectively. The former increases to 5.82 A W−1 at 1 V bias. Moreover, this device is polarization‐sensitive with a contrast ratio of 2. This work reveals the potential of the Te/WTe2 heterostructure for high‐performance room‐temperature infrared photodetectors. [ABSTRACT FROM AUTHOR]
- Subjects :
- INFRARED detectors
PHOTODETECTORS
CONDUCTION bands
VALENCE bands
Subjects
Details
- Language :
- English
- ISSN :
- 21951071
- Volume :
- 12
- Issue :
- 25
- Database :
- Complementary Index
- Journal :
- Advanced Optical Materials
- Publication Type :
- Academic Journal
- Accession number :
- 179412199
- Full Text :
- https://doi.org/10.1002/adom.202400776