Metal contact properties of poly3-octylthiophene thin films

Chemically synthesized undoped poly3-octylthiophene (P3OT) was deposited as thin films on conducting glass substrates by drop casting. Doping state of P3OT was obtained by adding FeCl 3 into the original P3OT solution. A qualitative explanation of the electrical contact behavior of the P3OT films wa...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2006-04, Vol.90 (6), p.760-769
Main Authors: Salinas, Oscar H., López-Mata, C., Hu, Hailin, Nicho, Ma. Elena, Sánchez, Aarón
Format: Article
Language:English
Subjects:
Applied sciences
Band diagram
Electrical contact behavior
Energy
Exact sciences and technology
Natural energy
Photovoltaic conversion
Poly3-octylthiophene
Schottky equation
Solar cells. Photoelectrochemical cells
Solar energy
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Summary:Chemically synthesized undoped poly3-octylthiophene (P3OT) was deposited as thin films on conducting glass substrates by drop casting. Doping state of P3OT was obtained by adding FeCl 3 into the original P3OT solution. A qualitative explanation of the electrical contact behavior of the P3OT films was given by a band diagram made from optical absorbance spectra and electrochemical current–voltage curves of the polymeric films. Gold contacts on both undoped and doped P3OT films give an ohmic contact. Silver/P3OT contact shows a rectifying behavior; the forward current is 500 times the reverse current at 0.5 V. Aluminum also forms rectifying contact with the two types of P3OT films, although the experimental rectification ratio is lower than that of the silver. The I–V curves of rectifying contacts were analyzed with Schottky equation and different diode parameters were obtained.
ISSN:0927-0248
1879-3398
DOI:10.1016/j.solmat.2005.04.013