High-photosensitivity p-channel organic phototransistors based on a biphenyl end-capped fused bithiophene oligomer

Yong-Young Noh; Dong-Yu Kim; Yoshida, Yuji; Yase, Kiyoshi; Byung-Jun Jung; Eunhee Lim; Hong-Ku Shim
January 2005
Applied Physics Letters;1/24/2005, Vol. 86 Issue 4, p043501
Academic Journal
We report highly photosensitive organic phototransistors (OPTs) based on a 2,5-bis-biphenyl-4-yl-thieno[3,2-b]thiophene (BPTT). The measured maximum sensitivity and the ratio of photocurrent to dark current (Iph/Idark) in BPTT OPTs were 82 A/W and 2.0×105 under 380 nm UV light with 1.55 mW/cm2, respectively. The prepared OPTs show a photocurrent response similar to the absorption spectrum of BPTT. The major mechanisms for photocurrent amplification in this device were verified from experimental results as photovoltaic (turn-on) and photocurrent effect (turn-off) by a fitting to theoretic equations.


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