期刊
ADVANCED MATERIALS INTERFACES
卷 7, 期 23, 页码 -出版社
WILEY
DOI: 10.1002/admi.202000893
关键词
2D heterojunctions; density functional theory; photovoltaic effect; p-n diodes; thickness; gate-dependent rectification
资金
- Nano-Material Technology Development Program, Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education
- Ministry of Science, ICT and Future Planning [2016R1D1A1B01015047, 2016M3A7B4909942, 2020R1A6A1A03043435]
- Korea Institute of Energy Technology Evaluation and Planning
- Ministry of Trade, Industry and Energy of the Republic of Korea [20172010106080]
- National Research Foundation of Korea [2020R1A6A1A03043435] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The p-n heterojunction fabricated by the vertical stacking of 2D materials is highly relevant to modern electronics and optoelectronic devices. This research reports a novel p-GeSe/n-WS(2)heterostructured diode exhibiting prominent thickness-dependent and gate-tunable rectification behavior. The rectification ratio increases as the thickness of WS(2)is increased. A rectification ratio of 10(4)is achieved by successfully sweeping the back-gate voltage. The modulation in the rectification behavior is ascribed to the interlayer electron-hole recombination. Density functional theory (DFT) calculations further support the thickness-dependent, gate-modulated experimental results. The diode exhibits efficient photodetection with promising figures of merit. The photoresponse is investigated under the illuminations of lambda equal to 365, 530, and 850 nm. The diode displays a high responsivity of 845 mA W(-1)at 850 nm. In addition, the diode exhibits a detectivity of 3.28 x 10(8)Jones, normalized photocurrent to dark current ratio (NPDR) of 1 x 10(8)W(-1), noise equivalent power (NEP) of 1.9 x 10(-12)WHz(-1/2), and a rise time of 10 ms. The p-GeSe/n-WS(2)diode demonstrates excellent rectification and optoelectronic characteristics.
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