| Abstract
| - The peak height and decay rate of the transient photocurrent generated by a 10-ns laser pulse impinging on an ITO/poly(thiophene-co-EDOT)/PV/Ag bilayer photocell was characterized. The peak height, but not the decay rate, is temperature- and field-dependent. A model was developed that accounts for this behavior.
- The transient photoconducting behavior of organic p/n bilayer photocells has beeninvestigated in cells constructed with the copolymer, poly(3-butylthiophene-co-ethylenedioxythiophene), as p-type material and a perylene diimide (PV) as the n-type material. Thedecay rate constant of the transient photocurrent observed after pulsed illumination isindependent of the applied electric field, light intensity, and temperature. However, the peakphotoresponse was strongly affected by these variables. Simulations of the photoresponserevealed that the peak current depends primarily on the carrier mobility (at a given lightintensity), whereas the characteristic decay rate is hardly influenced by the mobility, butdepends on the carrier lifetime which is chiefly due to trapping by deep levels.
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