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- W4385335414 abstract "Extensive study on two-dimensional (2D) van der Waals heterojunctions has primarily focused on PN diodes for fast-switching photo-detection, while achieving the same from 2D channel phototransistors has been rare despite their other advantages. Here, we have designed a high-speed phototransistor featuring a type III junction between p-MoTe2 channel and n-SnS2 top layer. Our photo-detecting device operates with a basis of negative photo-response (NPR), which originates from the recombination of photo-excited electrons in n-SnS2 and accumulated holes in the p-MoTe2 channel. For the NPR to occur, high-energy photons capable of exciting SnS2 (band gap ∼2.2 eV) have been found to be effective, because lower-energy photons simply penetrate the SnS2 top layer only to excite MoTe2 , leading to normal positive photo-response (PPR) which is known to be slow due to the photo-gating effects. Our NPR transistor showcases 0.5 ms-fast photo-responses and a high responsivity over 5000 A W-1 . More essentially, such carrier recombination mechanism is clarified with three experimental evidences. The phototransistor is finally modified with Au contact on n-SnS2 , to be a more practical device displaying voltage output. Three different photo-logic states under blue, near infra-red (NIR), and blue-NIR mixed photons are demonstrated using the voltage signals. This article is protected by copyright. All rights reserved." @default.
- W4385335414 created "2023-07-29" @default.
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- W4385335414 date "2023-07-28" @default.
- W4385335414 modified "2023-09-27" @default.
- W4385335414 title "Negative Photo‐Response Switching via Electron‐Hole Recombination at The Type Iii Junction of MoTe<sub>2</sub> Channel/SnS<sub>2</sub> Top Layer" @default.
- W4385335414 doi "https://doi.org/10.1002/adma.202304599" @default.
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- W4385335414 hasPublicationYear "2023" @default.
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