An efficient bulk-heterojunction photovoltaic cell based on energy transfer in graded-bandgap polymers

Gupta, D. ; Kabra, D. ; Kolishetti, N. ; Ramakrishnan, S. ; Narayan, K. S. (2007) An efficient bulk-heterojunction photovoltaic cell based on energy transfer in graded-bandgap polymers Advanced Functional Materials, 17 (2). pp. 226-232. ISSN 1616-3028

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/adfm.20...

Related URL: http://dx.doi.org/10.1002/adfm.200600183

Abstract

It is demonstrated that the energy transfer from low- conjugated (LC) poly[2-methoxy-5- (2-ethylhexyloxy)-1,4-phenylene vinylene] (MEHPPV) to high-conjugated (HC) MEHPPV, coupled with significant electron transfer from HC-MEHPPV to an acceptor species, offers a viable route for an efficient photodiode over a wide spectral range. An enhanced incident-photon-to-current conversion efficiency (IPCE) of 19% over a wide spectral range and a power-conversion efficiency (ηP) of 1% (under monochromatic illumination at λ ~530nm and a power density of ca.1mWcm-2) are achieved in a ternary polymer-blend film that consists of HC-MEHPPV (low bandgap), LC-MEHPPV (high bandgap), and an acceptor polymer, cyanoPPV (CNPPV), in an optimized ratio. The decisive role of the morphology that emerges during phase separation in the polymer blend is demonstrated by wide-field photocurrent imaging.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Charge Transfer; Conducting Polymers; Energy Transfer; Poly(phenylene Vinylene)s(PPVs); Photovoltaic Devices; Solar Cells; Organic
ID Code:60029
Deposited On:08 Sep 2011 10:08
Last Modified:08 Sep 2011 10:08

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