Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 2, Issue 4, Pages 626-632Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3tc31966k
Keywords
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Funding
- National Science Council, Taiwan [NSC 102-2112-M-006-002-MY3, NSC 102-2221-E-006-220-MY3]
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Control of the operating voltage in organic thin-film transistor (OTFT) based photosensors is a very important issue, which can effectively enhance photosensitivity by reducing the contribution of the fieldeffect current to the output current under darkness. In this study, we show a highly sensitive flexible organic photosensor, which is made by the use of cross-linked poly(4-vinylphenol) as a polymer dielectric layer and N, N'-ditridecyl-3,4,9,10-perylenetetracarboxylic diimide (PTCDI-C13H27) as an n-type active layer on a transparent polyethersulfone (PES) substrate, by tuning both source-drain and source-gate voltages to around the threshold voltage (Vt 3.0 V). Interestingly, a maximum photocurrent/ dark current ratio was obtained when the operating voltage was reduced to around Vt. The time-response characteristics and sensitivity of the PTCDI-C13H27-based photosensor were investigated. Considerable interest has been focused on developing a flexible in-cell remote touch screen that should comprise photosensitive OTFTs and switch OTFTs simultaneously. In this work, both switch-OTFTs and photo-OTFTs can be formed on the flexible PES substrate by use of the same fabrication process. The electrical characteristics of switch-OTFTs under bending states are discussed in terms of photoluminescence and time-resolved photoluminescence measurements, as well as quantum theory calculations.
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