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 = {Hunter, S and Mottram, AD and Anthopoulos, TD},
doi = {10.1063/1.4955282},
journal = {Journal of Applied Physics},
title = {Temperature and composition-dependent density of states in organic small-molecule/polymer blend transistors},
url = {},
volume = {120},
year = {2016}

RIS format (EndNote, RefMan)

AB - The density of trap states (DOS) in organic p-type transistors based on the small-molecule 2,8-difluoro-5,11-bis(triethylsilylethynyl) anthradithiophene (diF-TES ADT), the polymer poly(triarylamine) and blends thereof are investigated. The DOS in these devices are measured as a function of semiconductor composition and operating temperature. We show that increasing operating temperature causes a broadening of the DOS below 250 K. Characteristic trap depths of ∼15 meV are measured at 100 K, increasing to between 20 and 50 meV at room-temperature, dependent on the semiconductor composition. Semiconductor films with high concentrations of diF-TES ADT exhibit both a greater density of trap states as well as broader DOS distributions when measured at room-temperature. These results shed light on the underlying charge transport mechanisms in organic blend semiconductors and the apparent freezing-out of hole conduction through the polymer and mixed polymer/small molecule phases at temperatures below 225 K.
AU - Hunter,S
AU - Mottram,AD
AU - Anthopoulos,TD
DO - 10.1063/1.4955282
PY - 2016///
SN - 1089-7550
TI - Temperature and composition-dependent density of states in organic small-molecule/polymer blend transistors
T2 - Journal of Applied Physics
UR -
UR -
VL - 120
ER -