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Increased work function in PEDOT:PSS film under ultraviolet irradiation |
Xing Ying-Jie (邢英杰), Qian Min-Fang (钱旻昉), Guo Deng-Zhu (郭等柱), Zhang Geng-Min (张耿民) |
Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China |
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Abstract An increase of work function (0.3 eV) is achieved by irradiating poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) film in vacuum with 254-nm ultraviolet (UV) light. The mechanism for such an improvement is investigated by photoelectron yield spectroscopy, X-ray photo electron energy spectrum, and field emission technique. Surface oxidation and composition change are found as the reasons for work function increase. The UV-treated PEDOT:PSS film is used as the hole injection layer in a hole-only device. Hole injection is improved by UV-treated PEDOT:PSS film without baring the enlargement of film resistance. Our result demonstrates that UV treatment is more suitable for modifying the injection barrier than UV ozone exposure.
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Received: 22 July 2013
Revised: 29 October 2013
Accepted manuscript online:
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PACS:
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85.30.Hi
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(Surface barrier, boundary, and point contact devices)
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81.65.Cf
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(Surface cleaning, etching, patterning)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61076057, 61376059, 61171023, and 91221202,) and the National Basic Research Program of China (Grant Nos. 2012CB932701 and 2011CB933001). |
Corresponding Authors:
Xing Ying-Jie
E-mail: xingyj@pku.edu.cn
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Cite this article:
Xing Ying-Jie (邢英杰), Qian Min-Fang (钱旻昉), Guo Deng-Zhu (郭等柱), Zhang Geng-Min (张耿民) Increased work function in PEDOT:PSS film under ultraviolet irradiation 2014 Chin. Phys. B 23 038504
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