Nanomorphology influence on the light conversion mechanisms in highly efficient diketopyrrolopyrrole based organic solar cells

Ajuria, Jon, Chavhan, Sudam, Tena-Zaera, Ramon, Chen, Jihua, Rondinone, Adam J., Sonar, Prashant, Dodabalapur, Ananth , & Pacios, Roberto (2013) Nanomorphology influence on the light conversion mechanisms in highly efficient diketopyrrolopyrrole based organic solar cells. Organic Electronics, 14(1), pp. 326-334.

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In this work, diketopyrrolopyrrole-based polymer bulk heterojunction solar cells with inverted and regular architecture have been investigated. The influence of the polymer:fullerene ratio on the photoactive film nanomorphology has been studied in detail. Transmission Electron Microscopy and Atomic Force Microscopy reveal that the resulting film morphology strongly depends on the fullerene ratio. This fact determines the photocurrent generation and governs the transport of free charge carriers. Slight variations on the PCBM ratio respect to the polymer show great differences on the electrical behavior of the solar cell. Once the polymer:fullerene ratio is accurately adjusted, power conversion efficiencies of 4.7% and 4.9% are obtained for inverted and regular architectures respectively. Furthermore, by correlating the optical and morphological characterization of the polymer:fullerene films and the electrical behavior of solar cells, an ad hoc interpretation is proposed to explain the photovoltaic performance as a function of this polymer:blend composition.

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15 citations in Web of Science®

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ID Code: 75203
Item Type: Journal Article
Refereed: Yes
Keywords: Charge generation and transport, Diketopyrrolopyrrole, Inverted organic solar cells, Low bandgap, Nanomorphology, Charge generation, Diketopyrrolopyrroles, Nanomorphologies, Atomic force microscopy, Conversion efficiency, Fullerenes, Heterojunctions, Photovoltaic effects, Polymer films, Polymers, Transmission electron microscopy, Solar cells
DOI: 10.1016/j.orgel.2012.11.010
ISSN: 1566-1199
Divisions: Current > QUT Faculties and Divisions > Chancellery
Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Copyright Owner: Copyright 2012 Elsevier B.V.
Deposited On: 02 Oct 2014 22:50
Last Modified: 06 Oct 2014 21:47

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