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심교승

Sim, Kyoseung
Organic Soft Electronics and System Lab.
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Solution processed, aligned arrays of TCNQ micro crystals for low-voltage organic phototransistor

Author(s)
Mukherjee, BiswanathMukherjee, MoumitaSim, KyoseungPyo, Seungmoon
Issued Date
2011-02
DOI
10.1039/c0jm02513e
URI
https://scholarworks.unist.ac.kr/handle/201301/31610
Fulltext
https://pubs.rsc.org/en/content/articlelanding/2011/jm/c0jm02513e#!divAbstract
Citation
JOURNAL OF MATERIALS CHEMISTRY, v.21, no.6, pp.1931 - 1936
Abstract
A simple approach is developed to prepare periodic arrays of large, elongated crystals of p-conjugated organic molecules, viz, 7, 7, 8, 8-tetracyanoquinodimethane (TCNQ) through a solution based method. The ordered crystalline array is successfully used to fabricate low-voltage organic phototransistors (OPT). The OPT with polymeric gate dielectric exhibits very stable n-type characteristics with a low threshold voltage (<0.5 V). Under illumination, the devices produce a current gain (I-light/I-dark) of 31 at V-G = 0.3 V. Photoswitching occurs within 10 ms and photosensitivity is greater than 1 mA W-1 at low driving voltages and low optical powers. The drain current increases gradually with increasing the illumination intensity resulting in typical output FET characteristics. The one-step, solution-based, self-assembly method for highly ordered organic crystals in large area could have significant potential for future large-scale and low-cost optoelectronic devices. In addition, this study aims to aid the development of organic semiconductor materials with high quality crystalline structures for various optoelectronic applications.
Publisher
ROYAL SOC CHEMISTRY
ISSN
0959-9428
Keyword
THIN-FILM TRANSISTORSCHARGE-TRANSFERPENTACENEMOBILITYPOLYMERELECTRONICSDISPLAYSSHIFT

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