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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/9197

Title: Ternary mixing: A simple method to tailor the morphology of organic solar cells
Authors: Campoy-Quiles, Mariano
Kanai, Yoshihiro
El-Basaty, Ahmed
Sakai, Heisuke
Murata, Hideyuki
Keywords: Polymer:fullerene solar cells
Ternary systems
Bulk heterojunction
Morphology
Transport
Polythiophen
Issue Date: 2009-06-08
Publisher: Elsevier
Magazine name: Organic Electronics
Volume: 10
Number: 6
Start page: 1120
End page: 1132
DOI: 10.1016/j.orgel.2009.05.028
Abstract: We present a detailed study of the effects of ternary mixing on blend morphology, charge carrier mobility and organic solar cell performance. We investigate ternaries consisting of regio random poly(3-hexylthiophene) (P3HT), regio regular P3HT and soluble fullerene derivative, PCBM. By means of absorption, photoluminescence, atomic force microscopy and X-ray diffraction, we demonstrate that the structure of ternary films consists of crystallites of regular P3HT embedded into a random polymer matrix acting as a soft scaffolding where PCBM can only form nanoscale aggregates but cannot grow the detrimental micron-sized structures often observed in the conventional regular P3HT:PCBM case upon annealing. The ternary films exhibit higher degree of crystallinity than the conventional blends, but with smaller crystallite sizes. Moreover, we show that the addition of the random polymer chains does not prevent good charge carrier transport for regio random P3HT concentrations up to 50% of the total polymer content. Finally, we prove that solar cells based on the ternary systems have a similar short circuit current than the conventional binary, but improved open circuit current (by ~100 mV), which leads to an overall enhancement of power conversion efficiency.
Rights: NOTICE: This is the author's version of a work accepted for publication by Elsevier. Mariano Campoy-Quiles, Yoshihiro Kanai, Ahmed El-Basaty, Heisuke Sakai,and Hideyuki Murata, Organic Electronics, 10(6), 2009, 1120-1132, http://dx.doi.org/10.1016/j.orgel.2009.05.028
URI: http://hdl.handle.net/10119/9197
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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