Increased work function in PEDOT：PSS film under ultraviolet irradiation

doi:10.1088/1674-1056/23/3/038504

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.

Keywords: poly(3,4-ethylenedioxythiophene)：poly(styrene sulfonate) (PEDOT：PSS) film work function ultraviolet hole injection layer

Received: 22 July 2013
Revised: 29 October 2013
Accepted manuscript online:

PACS:	85.30.Hi	(Surface barrier, boundary, and point contact devices)
	81.65.Cf	(Surface cleaning, etching, patterning)

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

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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