High-photosensitivity p-channel organic phototransistors based on a biphenyl end-capped fused bithiophene oligomer
- 24 January 2005
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 86 (4) , 043501
- https://doi.org/10.1063/1.1856144
Abstract
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 ( I ph ∕ I dark ) in BPTT OPTs were 82 A ∕ W and 2.0 × 10 5 under 380 nm UV light with 1.55 mW ∕ cm 2 , 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.Keywords
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