Journal
NANO LETTERS
Volume 20, Issue 4, Pages 2733-2740Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00358
Keywords
Infrared photodetector; HVO2; Nanoparticle; Space charge-limited current (SCLC); Response time
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Funding
- National Research Foundation of Korea [NRF-2017R1A2B4003615]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2017R1D1A1B03036257]
- National Research Foundation of Korea [10Z20130000023] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Infrared photodetectors are sought for diverse applications and their performance relies on photoactive materials and photocurrent generation mechanisms. Her; we fabricate IR photodetectors with heavily hydrogen-doped VO2(i.e., HVO2) single-crystalline nanoparticles which show two orders greater resistivities than pure VO2. The I-V plots obtained under IR light irradiation are expressed by space charge limited current mechanism and the increase in photocurrent occurs due to the increase in the number of photoinduced trap sites. This phenomenon remarkably improves the key parameters at lambda = 780 nm of high responsivity of 35280 A/W, high detectivity of 1.12 X 10(13) Jones, and strikingly fast response times of 0.6-2.5 ns, that is, 3 orders of magnitude faster than the best records of two-dimensional structures and heterostructures. Density functional theory calculations illustrate that the generation of photoinduced trap sites is attributed to the movement of hydrogen atoms to less stable interstitial sites in VO2 under light exposure.
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