High-photosensitivity p-channel organic phototransistors based on a biphenyl end-capped fused bithiophene oligomer
Open Access
- 24 January 2005
- journal article
- research 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
This publication has 15 references indexed in Scilit:
- Organic phototransistor based on intramolecular charge transfer in a bifunctional spiro compoundApplied Physics Letters, 2004
- Organic field-effect transistors by a wet-transferring methodApplied Physics Letters, 2003
- Synthesis and Characterization of a New Light-Emitting Fluorene−Thieno[3,2-b]thiophene-Based Conjugated CopolymerMacromolecules, 2003
- Effect of Molecular Orientation of Epitaxially Grown Platinum(II) Octaethyl Porphyrin Films on the Performance of Field‐Effect TransistorsAdvanced Materials, 2003
- Light up-conversion from near-infrared to blue using a photoresponsive organic light-emitting deviceApplied Physics Letters, 2002
- Light responsive polymer field-effect transistorApplied Physics Letters, 2001
- Synthesis of thiophene/phenylene co‐oligomers. II [1]. Block and alternating co‐oligomersJournal of Heterocyclic Chemistry, 2000
- Photocurrent multiplication in naphthalene tetracarboxylic anhydride film at room temperatureApplied Physics Letters, 1996
- Optical control of microwave semiconductor devicesIEEE Transactions on Microwave Theory and Techniques, 1990
- Amorphous silicon phototransistorsApplied Physics Letters, 1990