Projects per year
van der Waals (vdW) heterostructures formed by stacking different two-dimensional layered materials have been demonstrated as a promising platform for next-generation photonic and optoelectronic devices due to their tailorable band-engineering properties. Here, we report a high photoresponsivity and broadband photodetector based on a WSe 2 /SnSe 2 heterostructure. By properly biasing the heterostructure, its band structure changes from near-broken band alignment to type-III band alignment which enables high photoresponsivity from visible to telecommunication wavelengths. The highest photoresponsivity and detectivity at 532 nm are ∼588 A W -1 and 4.4 × 10 10 Jones and those at 1550 nm are ∼80 A W -1 and 1.4 × 10 10 Jones, which are superior to those of the current state-of-the-art layered transition metal dichalcogenides based photodetectors under similar measurement conditions. Our work not only provides a new method for designing high-performance broadband photodetectors but also enables a deep understanding of the band engineering technology in the vdW heterostructures possible for other applications, such as modulators and lasers.
|Number of pages||8|
|Publication status||Published - 21 Feb 2019|
|MoE publication type||A1 Journal article-refereed|
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- 8 Finished
Sun, Z., Pyymaki Perros, A., Dai, Y., Lau Kuen Yao, L., Du, M., Kim, M., Hedberg, D. & Rajamanickam, R.
01/01/2019 → 31/12/2020
Project: Business Finland: New business from research ideas (TUTLI)
S2QUIP: Scalable Two-Dimensional Quantum Integrated Photonics
Sun, Z., Bai, X., Mohsen, A., Turunen, M., Hu, X., Du, M., Uddin, M., Wang, Y. & Yoon, H. H.
01/10/2018 → 31/03/2022
Project: EU: Framework programmes funding
LAYERED 2D MATERIALS BASED THZ SPECTROSCOPY AND IMAGING
Sun, Z., Generalov, A., Das, S., Hulkko, E., Mohsen, A. & Uddin, M.
01/01/2018 → 31/12/2021
Project: Academy of Finland: Other research funding
Anna Rissanen (Manager)Aalto University
OtaNano - Nanofab
Päivikki Repo (Manager)OtaNano