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Two BDT-TPP-Based Polymer Semiconductors: It’s Characterization and Application for Photovoltaics

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Novel conjugated polymers composed of benzodithiophene (BDT) unit and new acceptor TPP group, which has alkoxyphenyl substituent on thienopyrroledione (TPD) unit, were designed and synthesized. Two conjugated polymers have different side chains on BDT units and were applied to solar cell devices. OBDT-TPP with linear alkoxy side chain on the BDT unit showed a power conversion efficiency (PCE) of 1.55%, while EBDT-TPP with branched alkoxy side chains exhibited an increased PCE of 2.07%. UV-visible absorption and cyclic voltammetry measurements reveal that the different side chains on BDT unit have little influences on the optical band gap and the energy levels of the polymers. However, the XRD studies and hole mobility measurement exhibited increased polymer crystallinity and hole carrier mobility in EBDT-TPP:PC71BM blends. These results lead to slight increase in PCE of solar cell with EBDT-TPP.
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Keywords: Alkoxy Side Chain; Alkoxyphenyl Substituents; Bulk Heterojunction Solar Cell; Donor Molecular Structure; Polymer Solar Cell

Document Type: Research Article

Affiliations: 1: Department of Chemistry and RIGET, Gyeongsang National University, Jinju, 528-28, Republic of Korea 2: POSTECH Organic Electronics Laboratory, Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea

Publication date: August 1, 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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