Journal
ORGANIC ELECTRONICS
Volume 8, Issue 4, Pages 325-335Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2006.12.002
Keywords
plastic solar cells; photoinduced absorption; photocurrent; charge generation; photovoltaics
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Near-steady-state photoinduced absorption (PIA) spectroscopy is employed to study the charge carrier dynamics in polymer:fullerene (poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1-4-phenylene vinylene]: 1-(3-methoxycarbonyl)-propyl-1-phenyl-[6,6]C-61; MDMO-PPV:PCBM) solar cells under operating conditions. Artifacts in the PIA spectra originating from thermal heating of the aluminum electrode and from interference of incoming and reflected light waves are analyzed. PIA signals from functioning devices are studied as a function of applied bias and temperature and complemented with photocurrent measurements under identical conditions. Comparison between photocurrent and PIA measurements shows that PIA mainly probes trapped cationic charge carriers while the photocurrent samples mobile carriers. The number density of trap sites is estimated at 10(17) cm(-3) and trapped carriers can be stabilized by applying a reverse bias potential over the device. (c) 2007 Elsevier B.V. All rights reserved.
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