Effect of sorbitol doping in PEDOT:PSS on the electrical performance of organic photovoltaic devices
- Authors
- Park, Sungeun; Tark, Sung Ju; Kim, Donghwan
- Issue Date
- 11월-2011
- Publisher
- ELSEVIER
- Keywords
- Organic solar cells; Sorbitol; UPS; PEDOT:PSS
- Citation
- CURRENT APPLIED PHYSICS, v.11, no.6, pp.1299 - 1301
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- CURRENT APPLIED PHYSICS
- Volume
- 11
- Number
- 6
- Start Page
- 1299
- End Page
- 1301
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/111257
- DOI
- 10.1016/j.cap.2011.03.061
- ISSN
- 1567-1739
- Abstract
- Organic photovoltaic cells have important advantages, such as low cost and mechanical flexibility. The conducting polymer poly(3,4 ethylenedioxy-thiophene): poly(styrene sulfonate) (PEDOT:PSS) has been widely used as an interfacial layer or a polymer electrode in polymer electronic devices, such as photovoltaic devices and light-emitting diodes. In this report, we discuss the direct current (DC) conductivity of PEDOT: PSS films containing various weight ratios of sorbitol dopant. The work function is shown to steadily decrease with increasing dopant content. With different dopant contents, illuminated current-voltage photovoltaic characteristics were observed. Ultraviolet photoelectron spectroscopy (UPS) analysis revealed that the work function of the PEDOT: PSS was affected by its sorbitol content. The morphologies of the doped PEDOT: PSS films were characterized by atomic force microscopy (AFM). For the device fabrication, we made organic photovoltaic cells by a spin-coating process and Al deposition by thermal evaporation. The sorbitol dopant is able to improve the efficiency of the device. (C) 2011 Elsevier B.V. All rights reserved.
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