Journal
ACS PHOTONICS
Volume 9, Issue 5, Pages 1775-1782Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.2c00246
Keywords
tellurium; blackbody-sensitive; room-temperature infrared photodetector; van der Waals heterojunction; linear array devices
Categories
Funding
- National Key Research and Development Program of China [2019YFA0708203]
- Key Research and Development Program of Hubei Province [2021BAA071]
- National Natural Science Foundation of China [62174061, 62174063, 61904184, 61774065, 61974174, 62134009, 61874043, 62104053]
- Fundamental Research Funds for the Central Universities [2020kfyXJJS124]
- Director Fund of WNLO
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Emerging low-dimensional materials, such as tellurium (Te), have shown potential for realizing next-generation room-temperature black-body-sensitive infrared detectors. However, fabricating Te-based infrared detectors with low dark current and fast speed remains challenging. In this work, a heterojunction device based on Te and graphene is constructed, achieving high detectivity and a fast response time. The device demonstrates room-temperature blackbody sensitivity and potential for imaging applications.
Emerging low-dimensional materials exhibit thepotential in realizing next-generation room-temperature black-body-sensitive infrared detectors. As a narrow band gap semi-conductor, low-dimensional tellurium (Te) has been a focus ofinfrared detector research attention because of its high holemobility, large absorptivity, and environmental stability. However,it is still a challenge to fabricate blackbody-sensitive Te-basedinfrared detectors with a low dark current and fast speed. In thiswork, a heterojunction device based on Te and graphene isconstructed, achieving high detectivity and a fast response timefrom visible to mid-infrared. Specifically, under 2 mu m laserirradiation, the heterojunction photodetector exhibits a detectivity of 1.04x109cm Hz1/2W-1, a fast response time of 28 mu s,and good ambient stability. Moreover, the photodetector demonstrates a room-temperature blackbody sensitivity with the peakdetectivity of up to 3.69x108cm Hz1/2W-1under zero bias. Linear array devices are further explored and show good performanceuniformity for potential imaging applications. Our work demonstrates that the Te/graphene heterojunction detector will be one ofthe competitive candidates for next-generation uncooled blackbody-sensitive infrared photodetectors
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