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

2005; American Institute of Physics; Volume: 86; Issue: 4 Linguagem: Inglês

10.1063/1.1856144

1520-8842

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

Organic Light-Emitting Diodes Research

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 82A∕W and 2.0×105 under 380nm UV light with 1.55mW∕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.