Effects of iodine doping on small molecule organic semiconductors for high charge carrier mobility and photoconductivity
- Authors
- Yoon, Seongwon; Cho, Jangwhan; Yu, Seong Hoon; Son, Hae Jung; Chung, 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.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > School of Chemical Engineering and Material Science > 1. Journal Articles
- College of Natural Sciences > Department of Chemistry > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.