Morphological and Spectroscopic Studies of Electrochemically Deposited Poly(3,4-ethylenedioxythiophene) (PEDOT) Hole Extraction Layer for Organic Photovoltaic Device (OPVd) Fabrication

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• 作者：Eduard Nasybulin ; Shu Wei ; Marshall Cox ; Ioannis Kymissis ; Kalle Levon
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：March 17, 2011
• 年：2011
• 卷：115
• 期：10
• 页码：4307-4314
• 全文大小：1055K
• 年卷期：v.115,no.10(March 17, 2011)
• ISSN：1932-7455

文摘

Poly(3,4-ethylenedioxythiophene) (PEDOT) was deposited on ITO surface by cyclic voltammetry from mixed toluene/acetonitrile solvent. Thickness and oxidation state of the layer were monitored by UV鈭抳is鈭扤IR spectroscopy and grazing angle FTIR (GA-FTIR) spectroscopy. Morphology had fibrillar character with roughness and porosity dependent on the thickness of the layer. PEDOT was incorporated into organic photovoltaic cell as a hole extraction layer with spin-coated P3HT鈭扨CBM intrinsic layer without further annealing. Performance of the cell was found to be effected by the morphology of the PEDOT layer. A fully doped PEDOT layer of moderate thickness was found to have the highest efficiency demonstrating an open-circuit voltage (V_oc) of 0.48 V, short-circuit current (I_sc) of 5.1 mA/cm², fill factor (FF) of 0.46, and overall efficiency (蔚) of 1.1%. Electrochemically deposited PEDOT was compared to traditional spin-coated PEDOT鈭扨SS of the same thickness. Although V_oc and I_sc were the same, a 30% improvement in the fill factor was observed for electrochemically deposited PEDOT. The phenomenon was attributed to lower series resistance of the cell due to higher hole mobility of pure PEDOT and better electrical contacts with both the ITO electrode and intrinsic layers.