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Proceedings Paper

Organic thin film phototransistors: materials and mechanism
Author(s): Yong-Young Noh; Dong-Yu Kim; Yuji Yoshida; Kiyoshi Yase; Byung-Jun Jung; Eunhee Lim; Hong-Ku Shim
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Paper Abstract

Highly photosensitive organic phototransistors (OPTs) with an organic thin film transistors configuration based on a biphenyl end capped fused bithiophene oligomer (BPTT) and copper phthalocyanine (CuPC) were prepared. The measured maximum responsivity and the ratio of photocurrent to dark current (IPh/IDark) in BPTT and CuPC OPTs were 82 A/W, 2 A/W and 2.0 × 105, 1000 under 365 nm UV light with 1.55 mW/cm2, respectively. The prepared OPTs showed a photocurrent response similar to the photo to current conversion efficiency (IPCE) spectrum of BPTT and CuPC. The main mechanisms responsible for photocurrent amplification in the devices were examined by comparing theoretical and measured data. The photovoltaic (turn-on) and photoconductive effect (turn-off) of the OPTs were determined by fitting to theoretical equations. The findings confirmed that the operation of the OPTs followed as photo-voltaic (turn-on state) and photo-conductive (turn-off state) behaviors.

Paper Details

Date Published: 4 April 2005
PDF: 11 pages
Proc. SPIE 5724, Organic Photonic Materials and Devices VII, (4 April 2005); doi: 10.1117/12.592435
Show Author Affiliations
Yong-Young Noh, Gwangju Institute of Science and Technology (South Korea)
Dong-Yu Kim, Gwangju Institute of Science and Technology (South Korea)
Yuji Yoshida, National Institute of Advanced Industrial Science and Technology (Japan)
Kiyoshi Yase, National Institute of Advanced Industrial Science and Technology (Japan)
Byung-Jun Jung, Samsung SDI Co., Ltd. (South Korea)
Eunhee Lim, Korea Advanced Institute of Science and Technology (South Korea)
Hong-Ku Shim, Korea Advanced Institute of Science and Technology (South Korea)


Published in SPIE Proceedings Vol. 5724:
Organic Photonic Materials and Devices VII
James G. Grote; Toshikuni Kaino; Francois Kajzar, Editor(s)

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