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Open AccessArticle

Enhanced Photovoltaic Properties of Bulk Heterojunction Organic Photovoltaic Devices by an Addition of a Low Band Gap Conjugated Polymer

Department of Materials Chemistry and Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea
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Academic Editor: Joshua M. Pearce
Materials 2016, 9(12), 996; https://doi.org/10.3390/ma9120996
Received: 7 November 2016 / Revised: 2 December 2016 / Accepted: 2 December 2016 / Published: 8 December 2016
(This article belongs to the Section Energy Materials)
In this study, we fabricated organic photovoltaics (OPVs) by introducing the polymer additive HTh6BT into the photoactive layer of a poly(3-hexylthiophene):phenyl-C61-butyric acid methyl ester (P3HT:PCBM) system. The HTh6BT had a relatively low band gap energy of 1.65 eV and a molecular and crystalline structure similar to that of P3HT. In the photoactive layer, the HTh6BT and P3HT can both act as donors. In such parallel-type bulk heterojunctions, each donor can form excitons and generate charges while being separated from the donor/acceptor interface. Changes in the photovoltaic property of the OPV device by the addition of HTh6BT were evaluated, and the optical characteristics of the photoactive layer, as well as the surface morphology, polymer ordering, and crystallinity of the P3HT:PCBM film were analyzed. Compared to a device without HTh6BT, all short-circuit current densities, open-circuit voltages, and fill factors were enhanced, leading to the enhancement of the power conversion efficiency by 36%. View Full-Text
Keywords: organic photovoltaics; ternary blend system; parallel-type bulk heterojunction solar cell; low band gap conjugated polymer organic photovoltaics; ternary blend system; parallel-type bulk heterojunction solar cell; low band gap conjugated polymer
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Lee, E.J.; Choi, M.H.; Moon, D.K. Enhanced Photovoltaic Properties of Bulk Heterojunction Organic Photovoltaic Devices by an Addition of a Low Band Gap Conjugated Polymer. Materials 2016, 9, 996.

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