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Issue 9, 2014
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Photocurrent spectroscopic studies of diketopyrrolopyrrole-based statistical copolymers

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Abstract

Diketopyrrolopyrrole (DPP) containing copolymers have gained a lot of interest in organic optoelectronics with great potential in organic photovoltaics. In this work, DPP based statistical copolymers, with slightly different bandgap energies and a varying fraction of donor–acceptor ratio are investigated using monochromatic photocurrent spectroscopy and Fourier-transform photocurrent spectroscopy (FTPS). The statistical copolymer with a lower DPP fraction, when blended with a fullerene derivative, shows the signature of an inter charge transfer complex state in photocurrent spectroscopy. Furthermore, the absorption spectrum of the blended sample with a lower DPP fraction is seen to change as a function of an external bias, qualitatively similar to the quantum confined Stark effect, from where we estimate the exciton binding energy. The statistical copolymer with a higher DPP fraction shows no signal of the inter charge transfer states and yields a higher external quantum efficiency in a photovoltaic structure. In order to gain insight into the origin of the observed charge transfer transitions, we present theoretical studies using density-functional theory and time-dependent density-functional theory for the two pristine DPP based statistical monomers.

Graphical abstract: Photocurrent spectroscopic studies of diketopyrrolopyrrole-based statistical copolymers

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Supplementary files

Article information


Submitted
03 Nov 2013
Accepted
03 Jan 2014
First published
06 Jan 2014

Phys. Chem. Chem. Phys., 2014,16, 4291-4298
Article type
Paper

Photocurrent spectroscopic studies of diketopyrrolopyrrole-based statistical copolymers

D. Moghe, G. K. Dutta, S. Patil and S. Guha, Phys. Chem. Chem. Phys., 2014, 16, 4291
DOI: 10.1039/C3CP54644F

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