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Photoresponsive Transistors Based on a Dual Acceptor-Containing Low-Bandgap Polymer

Title
Photoresponsive Transistors Based on a Dual Acceptor-Containing Low-Bandgap Polymer
Authors
Kim M.J.Choi S.Lee M.Heo H.Lee Y.Cho J.H.Kim B.
Ewha Authors
김봉수
SCOPUS Author ID
김봉수scopus
Issue Date
2017
Journal Title
ACS Applied Materials and Interfaces
ISSN
1944-8244JCR Link
Citation
vol. 9, no. 22, pp. 19011 - 19020
Keywords
carrier mobilitylow-bandgap polymerphotoresponsephotoswitchingphototransistor
Publisher
American Chemical Society
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
In this Article, low-bandgap pTTDPP-BT polymers based on electron-accepting pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione (DPP) and benzothiadiazole (BT) and electron-donating thienothiophene (TT) moieties were synthesized. Phototransistors have been fabricated using ambipolar-behaving pTTDPP-BT polymers as active channel materials. The electrical and photoresponsive properties of the pTTDPP-BT phototransistors were strongly dependent on the film annealing temperature. As-spun pTTDPP-BT phototransistors exhibited a low hole mobility of 0.007 cm2/(V·s) and a low electron mobility of 0.005 cm2/(V·s), which resulted in low photocurrent detection due to the limited transport of the charge carriers. Thermal treatment of the polymer thin films led to a significant enhancement in the carrier mobilities (hole and electron mobilities of 0.066 and 0.115 cm2/(V·s), respectively, for 200 °C annealing) and thus significantly improved photoresponsive properties. The 200 °C-annealed phototransistors showed a wide-range wavelength (405-850 nm) of photoresponse, and a high photocurrent/dark-current ratio of 150 with a fast photoswitching speed of less than 100 ms. This work demonstrates that a dual acceptor-containing low band gap polymer can be an important class of material in broadband photoresponsive transistors, and the crystallinity of the semiconducting polymer layer has a significant effect on the photoresponse characteristics. © 2017 American Chemical Society.
DOI
10.1021/acsami.7b03058
Appears in Collections:
사범대학 > 과학교육과 > Journal papers
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