S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Others_전기·정보공학부
Fast Transient "Photoconductivity" in Semiconducting Polymers: Free Carrier Photocurrent or Displacement Current Generated by Electric-Field-Induced Polarization of Bound Excitons?
- Moses, D.; Cormoretto, D.; Lee, Changhee; Heeger, A. J.
- Issue Date
- Synth. Met.84 (1997) 559
- We have re-examined the displacement current interpretation of the fast transient photocurrent in semiconducting polymers. We find that our earlier calculation was in error by a factor of 4π (arising from incorrectly converting from MKS units). We re-evaluate the displacement current contribution using the earlier data obtained from spin-cast PPV and data from tensile drawn samples of PPV. The drawn and oriented PPV yields a fast transient photocurrent that is three orders of magnitude larger than that obtained from spin-cast films (when normalized to the same incident photon flux and to the same applied electric field). For the best samples, analysis of the data in terms of a displacement current from bound excitons would require an exciton polarizability, (αexc > 107 Å3, far too large to arise from bound excitons. For comparison, we summarize the data available from other conjugated polymers as well
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