S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Others_전기·정보공학부
Dynamics of Photoexcited Carriers in Poly(P-Phenylenevinylene) and Its Soluble Derivative
- Lee, Changhee; Yu, G.; Moses, D.; Heeger, A. J.
- Issue Date
- Synth. Met. 69 (1995) 429
- The dynamics of photoexcited carriers in poly(p-phenylene vinylene) (PPV) and its soluble derivative, poly[2-methoxy-5-(2′-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV) are studied using the measurement of subnanosecond transient photoconductivity (PC). An initial transient photocurrent decays in the subnanosecond time regime, followed by a thermally-activated slow tail. The magnitude of the peak transient PC is almost temperature independent and proportional to the light intensity and electric field. The results are interpreted as a free carrier generation via a π-π* interband transition. The transient PC in MEH-PPV is an order of magnitude smaller than that in PPV, indicating that the decrease of the interchain coupling due to the bulky side-chains results in a smaller quantum efficiency for carrier generation.
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