Effect of sorbitol doping in PEDOT:PSS on the electrical performance of organic photovoltaic devices
Effect of sorbitol doping in PEDOT:PSS on the electrical performance of organic photovoltaic devices
- 주제(키워드) Organic solar cells , Sorbitol , UPS , PEDOT:PSS
- 발행기관 한국물리학회
- 발행년도 2011
- 총서유형 Journal
- UCI G704-001115.2011.11.6.010
- KCI ID ART001603591
- 본문언어 영어
초록/요약
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.
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