Organic thin film phototransistors: materials and mechanism

Yong-Young Noh; Dong-Yu Kim; Yuji Yoshida; Kiyoshi Yase; Byung-Jun Jung; Eunhee Lim; Hong-Ku Shim

doi:10.1117/12.592435

4 April 2005 Organic thin film phototransistors: materials and mechanism

Yong-Young Noh, Dong-Yu Kim, Yuji Yoshida, Kiyoshi Yase, Byung-Jun Jung, Eunhee Lim, Hong-Ku Shim

Proceedings Volume 5724, Organic Photonic Materials and Devices VII; (2005) https://doi.org/10.1117/12.592435
Event: Integrated Optoelectronic Devices 2005, 2005, San Jose, California, United States

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.

Citation Download Citation

Yong-Young Noh, Dong-Yu Kim, Yuji Yoshida, Kiyoshi Yase, Byung-Jun Jung, Eunhee Lim, and Hong-Ku Shim "Organic thin film phototransistors: materials and mechanism", Proc. SPIE 5724, Organic Photonic Materials and Devices VII, (4 April 2005); https://doi.org/10.1117/12.592435

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