Imperial College London


Faculty of Natural SciencesDepartment of Physics

Visiting Professor



+44 (0)20 7594 6669thomas.anthopoulos Website




Mrs Carolyn Dale +44 (0)20 7594 7579




1111Blackett LaboratorySouth Kensington Campus






BibTex format

author = {Wobkenberg, PH and Labram, JG and Swiecicki, J and Parkhomenko, K and Sredojevic, D and Gisselbrecht, J and de, Leeuw DM and Bradley, DDC and Djukic, J and Anthopoulos, TD},
doi = {10.1039/B919970E},
journal = {Journal of Materials Chemistry},
pages = {3673--3680},
title = {Ambipolar organic transistors and near-infrared phototransistors based on a solution-processable squarilium dye},
url = {},
volume = {20},
year = {2010}

RIS format (EndNote, RefMan)

AB - Implementation of organic transistors in low-end, large-volume microelectronics depends, greatly, on the level of performance that can be achieved, but also on the compatibility of the technology with low-cost processing methodologies. Here we examine the suitability of a family of solution-processable zwitterionic molecules, so-called squarilium dyes, for the fabrication of organic ambipolar transistors and their application in (opto)electronic circuits. Ambipolar organic semiconductors and transistors are interesting because they could deliver performance characteristics (i.e. noise margins and signal gain) similar to that of complementary logic, but with the fabrication simplicity associated with unipolar logic (i.e. single semiconductor material and single type of metal electrodes). By designing squarilium dyes with appropriate electrochemical characteristics we demonstrate single-layer organic transistors that exhibit ambipolar charge transport with balanced electron and hole mobilities. By integrating a number of these ambipolar transistors we are also able to demonstrate complementary-like voltage inverters with wide noise margin and high signal gain. Another interesting feature of the squarilium dyes studied here is their strong absorption in the near-infrared (NIR) region of the electromagnetic spectrum. By exploring this interesting property we are able to demonstrate NIR light-sensing ambipolar organic transistors with promising operating characteristics.
AU - Wobkenberg,PH
AU - Labram,JG
AU - Swiecicki,J
AU - Parkhomenko,K
AU - Sredojevic,D
AU - Gisselbrecht,J
AU - de,Leeuw DM
AU - Bradley,DDC
AU - Djukic,J
AU - Anthopoulos,TD
DO - 10.1039/B919970E
EP - 3680
PY - 2010///
SN - 0959-9428
SP - 3673
TI - Ambipolar organic transistors and near-infrared phototransistors based on a solution-processable squarilium dye
T2 - Journal of Materials Chemistry
UR -
VL - 20
ER -