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Photogeneration and photovoltaic effect in poly(N-vinylcarbazole):TiO2bulk-heterojunction elaborated by hydrolysis–condensation reactions of TiO2precursors

Authors
Journal
Synthetic Metals
0379-6779
Publisher
Elsevier
Publication Date
Volume
159
Identifiers
DOI: 10.1016/j.synthmet.2008.11.014
Keywords
  • Bulk Heterojunction
  • Pvk
  • Tio2Precursor
  • Hydrolysis
  • Surface Potential Decay
Disciplines
  • Physics

Abstract

Abstract TiO 2:poly(N-vinylcarbazole) (PVK) bulk-heterojunctions (BHJ) have been elaborated from a blend of a TiO 2 precursor with the polymer in solution. The TiO 2 precursor is hydrolyzed with the surrounding air humidity in thin film. Titanium isopropoxide [Ti( iOPr) 4] and Tetrakis (9H-carbazole-9-yl-ethyl-oxy) titanium [Ti(OeCarb) 4] were used as TiO 2 precursor. Photogeneration quantum yield in BHJ of TiO 2:PVK were determined by the surface potential decay (SPD) technique. Photovoltaic effect was studied in ITO/PEDOT:PSS/TiO 2:PVK/Al structures. It was found that the photovoltaic performance is strongly dependent on the homogeneity of the blends. The improved dispersion of the TiO 2 phase obtained with the precursor bearing a carbazole group allows efficient electron transport and fill factor enhancement of the photovoltaic devices.

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