Photogenerated charge carrier transport in p-polymer n-polymer bilayer structures

Manoj, A. G. ; Alagiriswamy, A. A. ; Narayan, K. S. (2003) Photogenerated charge carrier transport in p-polymer n-polymer bilayer structures Journal of Applied Physics, 94 (6). pp. 4088-4095. ISSN 1089-7550

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Official URL: http://jap.aip.org/resource/1/japiau/v94/i6/p4088_...

Related URL: http://dx.doi.org/10.1063/1.1600829

Abstract

We investigate polymer bilayer structures that can be utilized effectively for efficient photovoltaic properties. The transport characteristics of photogenerated free charge carriers across the interface of a bilayer consisting of p-type polymer poly(3-octyl thiophene) (P3OT) or poly(2- methoxy, 5-(2-ethylhexoxy)-1, 4-phenylene vinylene) (MEHPPV) and n-type polymer poly(benzamidazobenzo phenanthroline) (BBL) are studied using photocurrent spectral response, intensity modulated photocurrent spectra, current-voltage, and thermally stimulated current measurements. The parameters governing the device efficiency are controlled by the interfacial defect characteristics and electric field redistribution in the device. A clear evidence of these defect states at the polymer-polymer interface is revealed using the time and frequency domain photocurrent measurements. We compare the figure of merits of the P3OT/BBL and MEHPPV/BBL structures and correlate these properties to the interfacial processes.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Conducting Polymers; Organic Semiconductors; p-n Heterojunctions; Photoconductivity; Thermally Stimulated Currents
ID Code:60025
Deposited On:08 Sep 2011 10:05
Last Modified:08 Sep 2011 10:05

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