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Effects of iodine doping on small molecule organic semiconductors for high charge carrier mobility and photoconductivity

Authors
Yoon, SeongwonCho, JangwhanYu, Seong HoonSon, Hae JungChung, Dae Sung
Issue Date
Jul-2016
Publisher
ELSEVIER SCIENCE BV
Keywords
Small molecules; Electrochemical doping; p-DTS(FBTTh2)(2); Iodine; Organic semiconductor
Citation
ORGANIC ELECTRONICS, v.34, pp 28 - 32
Pages
5
Journal Title
ORGANIC ELECTRONICS
Volume
34
Start Page
28
End Page
32
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/45673
DOI
10.1016/j.orgel.2016.03.035
ISSN
1566-1199
1878-5530
Abstract
Here we report the effects of iodine doping on small molecule organic semiconductors. Thin films of semiconducting p-DTS(FBTTh2)(2) doped with 1-5 wt% iodine were fabricated and their photo-physical, crystallographic, morphological, and electrical properties were systematically analyzed. The doping significantly increased the energetic distance between the highest occupied molecular orbital (HOMO) and Fermi level of p-DTS(FBTTh2)(2), typical for p-type doping. In addition, depletion mode transistor measurements showed an increase in the hole concentration with increasing dopant concentration. From grazing incidence X-ray diffraction (GIXD) analyses of iodine-doped p-DTS(FBTTh2)(2) films, we observed significant changes in the crystal orientation at the optimal doping ratio of 1 wt%. Atomic force microscopy (AFM) analyses showed morphological changes with respect to dopant concentrations, which were in good agreement with the GIXD results. As a result, accumulation mode transistor measurements demonstrated an increase in the hole mobility by 54% at the optimized doping concentration compared to an undoped device. Furthermore, photoconductive device operation revealed that iodine-doping can induce dramatically enhanced photo-responsivity as high as 2.08 A/W. We demonstrate that iodine doping can be a simple and effective method for enhancing the performance of small molecule-based electronic devices, by optimizing the energy level configuration as well as enhancing intermolecular interactions. (C) 2016 Elsevier B.V. All rights reserved.
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