Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Effects of Carrier Mobility on Photocurrent Generation in $TiO_2/Poly$(alkylthiophene) Photovoltaic Devices

  • Song, Mi-Yeon (Department of Chemistry and Molecular Engineering, Korea University) ;
  • Kim, Kang-Jin (Department of Chemistry and Molecular Engineering, Korea University) ;
  • Kim, Dong-Young (Optoelectronic Materials Research Center, Korea Institute of Science and Technology)
  • Published : 2006.12.31
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Abstract

In heterojunction photovoltaic devices of $ITO/TiO_2/poly$(3-alkylthiophene)/Au, the photo current was characterized at different temperatures for different alkyl chain lengths and regioregularities: regiorandom, regioregular poly(3-hexylthiophene), and regioregular poly(3-dodecylthiophene). The regioregularity and alkyl chain length affected the photovoltaic characteristics due to differences in hole-carrier transportation. The drift charge mobilities of these devices were analyzed by the space-charge-limited current theory using the relation between the dark current and the bias voltage. The photocurrent in the devices based on poly(3-alkylthiophene)s decreased rapidly below the temperature at which the drift charge mobility was $10^{-5}\;cm^2/V{\cdot}s$.

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