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Photophysical Study of Polymer-Based Solar Cells with an Organo-Boron Molecule in the Active Layer

1
Centro de Investigaciones en Óptica, A.P. 1-948, León, Gto. 37150, Mexico
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Centro de Investigación en Ingeniería y Ciencias Aplicadas (CIICAp), Universidad Autónoma del Estado de Morelos, Av. Universidad No. 1001, Col. Chamilpa, Cuernavaca, Mor. C.P. 62209, Mexico
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Douglas Ivey
Materials 2015, 8(7), 4258-4272; https://doi.org/10.3390/ma8074258
Received: 20 May 2015 / Revised: 9 June 2015 / Accepted: 6 July 2015 / Published: 13 July 2015
(This article belongs to the Section Energy Materials)
Our group previously reported the synthesis of four polythiophene derivatives (P1–P4) used for solar cells. The cells were prepared under room conditions by spin coating, leading to low efficiencies. However, after the addition of 6-nitro-3-(E)-3-(4-dimethylaminophenyl)allylidene)-2,3-dihydrobenzo[d]-[1,3,2] oxazaborole (M1) to their active layers, the efficiencies of the cells showed approximately a two-fold improvement. In this paper, we study this enhancement mechanism by performing ultrafast transient absorption (TA) experiments on the active layer of the different cells. Our samples consisted of thin films of a mixture of PC61BM with the polythiophenes derivatives P1–P4. We prepared two versions of each sample, one including the molecule M1 and another without it. The TA data suggests that the efficiency improvement after addition of M1 is due not only to an extended absorption spectrum towards the infrared region causing a larger population of excitons but also to the possible creation of additional channels for transport of excitons and/or electrons to the PC61BM interface. View Full-Text
Keywords: organic photovoltaics; borinate; polythiophenes; transient absorption; bulk heterojunction organic photovoltaics; borinate; polythiophenes; transient absorption; bulk heterojunction
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Romero-Servin, S.; Villa, M.D.A.; Carriles, R.; Ramos-Ortíz, G.; Maldonado, J.-L.; Rodríguez, M.; Güizado-Rodríguez, M. Photophysical Study of Polymer-Based Solar Cells with an Organo-Boron Molecule in the Active Layer. Materials 2015, 8, 4258-4272.

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