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• W3089228519 abstract "Abstract The intriguing carrier dynamics in graphene heterojunctions have stimulated great interest in modulating the optoelectronic features to realize high-performance photodetectors. However, for most phototransistors, the photoresponse characteristics are modulated with an electrical gate or a static field. In this paper, we demonstrate a graphene/C 60 /pentacene vertical phototransistor to tune both the photoresponse time and photocurrent based on light modulation. By exploiting the power-dependent multiple states of the photocurrent, remarkable logical photocurrent switching under infrared light modulation occurs in a thick C 60 layer (11 nm) device, which implies competition of the photogenerated carriers between graphene/C 60 and C 60 /pentacene. Meanwhile, we observe a complete positive-negative alternating process under continuous 405 nm irradiation. Furthermore, infrared light modulation of a thin C 60 (5 nm) device results in a photoresponsivity improvement from 3425 A/W up to 7673 A/W, and we clearly probe the primary reason for the distinct modulation results between the 5 and 11 nm C 60 devices. In addition, the tuneable bandwidth of the infrared response from 10 to 3 × 10 3 Hz under visible light modulation is explored. Such distinct types of optical modulation phenomena and logical photocurrent inversion characteristics pave the way for future tuneable logical photocurrent switching devices and high-performance phototransistors with vertical graphene heterojunction structures." @default.
• W3089228519 created "2020-10-01" @default.
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• W3089228519 date "2020-09-23" @default.
• W3089228519 modified "2023-10-15" @default.
• W3089228519 title "Light-modulated vertical heterojunction phototransistors with distinct logical photocurrents" @default.
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• W3089228519 doi "https://doi.org/10.1038/s41377-020-00406-4" @default.
• W3089228519 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7509774" @default.
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