Abstract:
:The mid-infrared (MIR) spectral range, pertaining to important applications, such as molecular "fingerprint" imaging, remote sensing, free space telecommunication, and optical radar, is of particular scientific interest and technological importance. However, state-of-the-art materials for MIR detection are limited by intrinsic noise and inconvenient fabrication processes, resulting in high-cost photodetectors requiring cryogenic operation. We report black arsenic phosphorus-based long-wavelength IR photodetectors, with room temperature operation up to 8.2 μm, entering the second MIR atmospheric transmission window. Combined with a van der Waals heterojunction, room temperature-specific detectivity higher than 4.9 × 109 Jones was obtained in the 3- to 5-μm range. The photodetector works in a zero-bias photovoltaic mode, enabling fast photoresponse and low dark noise. Our van der Waals heterojunction photodetectors not only exemplify black arsenic phosphorus as a promising candidate for MIR optoelectronic applications but also pave the way for a general strategy to suppress 1/f noise in photonic devices.
journal_name
Sci Advjournal_title
Science advancesauthors
Long M,Gao A,Wang P,Xia H,Ott C,Pan C,Fu Y,Liu E,Chen X,Lu W,Nilges T,Xu J,Wang X,Hu W,Miao Fdoi
10.1126/sciadv.1700589subject
Has Abstractpub_date
2017-06-30 00:00:00pages
e1700589issue
6issn
2375-2548pii
1700589journal_volume
3pub_type
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