A MoSe2/WSe2 Heterojunction-Based Photodetector at Telecommunication Wavelengths

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2018-11-21
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Mcode
Degree programme
Language
en
Pages
Series
Advanced Functional Materials, articlenumber 1804388
Abstract
van der Waals (vdW) heterojunctions enable arbitrary combinations of different layered semiconductors with unique band structures, offering distinctive band engineering for photonic and optoelectronic devices with new functionalities and superior performance. Here, an interlayer photoresponse of a few-layer MoSe2/WSe2 vdW heterojunction is reported. With proper electrical gating and bias, the heterojunction exhibits high-sensitivity photodetection with the operation wavelength extended up to the telecommunication band (i.e. 1550 nm). The photoresponsivity and normalized photocurrent-to-dark current ratio reach up to 127 mA W−1 and 1.9 × 104 mW−1, respectively. The results not only provide a promising solution to realize high-performance vdW telecommunication band photodetectors, but also pave the way for using sub-bandgap engineering of two-dimensional layered materials for photonic and optoelectronic applications.
Description
Keywords
MoSe, photodetectors, sub-bandgap photodetection, van der Waals heterojunction, WSe
Other note
Citation
Xue, H, Wang, Y, Dai, Y, Kim, W, Jussila, H, Qi, M, Susoma, J, Ren, Z, Dai, Q, Zhao, J, Halonen, K, Lipsanen, H, Wang, X, Gan, X & Sun, Z 2018, ' A MoSe 2 /WSe 2 Heterojunction-Based Photodetector at Telecommunication Wavelengths ', Advanced Functional Materials, vol. 28, no. 47, 1804388 . https://doi.org/10.1002/adfm.201804388