Journal
ADVANCED OPTICAL MATERIALS
Volume 10, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202200143
Keywords
photocurrent mapping; photodetectors; p-n heterojunction; underwater optical communication; visible-near infrared
Categories
Funding
- National Natural Science Foundation of China [61974014]
- 111 Project [B20030]
- Fundamental Research Funds for the Central Universities [ZYGX2019Z018]
- UESTC Shared Research Facilities of Electromagnetic Wave and Matter Interaction [Y0301901290100201]
- Innovation Group Project of Sichuan Province [20CXTD0090]
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A facile van der Waals (vdWs) structured p-n heterojunction has been demonstrated by simply transferring 2D materials, showing broadband spectral response and diode-like behavior. The photodetector based on this heterojunction exhibits high performance and low power consumption in an underwater optical communication system.
P-n junctions based on 2D materials can be achieved using a selective doping technique, while such a method is challenged by the complex fabrication process. Here, a facile van der Waals (vdWs) structured p-n heterojunction is demonstrated by simply transferring an n-type multilayer alpha-In2Se3 (direct bandgap) on a p-type ultra-thin WSe2 nanosheet. The vdWs stacked photodetector with an improved type-II band alignment not only realizes a broadband spectral response from visible to near infrared (405-905 nm), but also operates well with a diode-like behavior. This behavior is further confirmed by the high-resolution scanning photocurrent mapping. As a result, the as-fabricated device exhibits a short response time (<120 mu s) and a high responsivity of 1.84 A W-1 under 520 nm laser illumination. Accordingly, an underwater optical communication system based on the WSe2/alpha-In2Se3 p-n heterojunction photodetector is demonstrated, which is promising for next-generation high-performance and low-power detection applications.
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