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Fluorene-Based Conjugated Polyelectrolytes as Interlayers for Organic Photovoltaic Cells

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In this study, we explored the effect of interlayers between ZnO layer and active layer on the performance of inverted organic photovoltaic cells by employing fluorene-based conjugated poly-electrolytes (CPE) with different side chains. Poly[9,9′-bis(6″-N,N,N-trimethyl- ammoniumhexyl)fluorene-alt-1,4-phenylene dibromide] (P1) and poly[(9,9′-bis(4-(6-N,N,N-trimethyl- ammoniumhexyloxy)phenyl) fluorene-2,7-diyl)-alt-1,4-phenylene dibromide] (P2) were synthesized and used as interlayers in inverted organic photovoltaic cells. We fabricated organic photovoltaic devices with the following structure: ITO/ZnO/CPE/active layer/MoO3/Ag. The CPE was applied between the ZnO layer and active layer, which comprised poly[4,8-bis-(5-(2-ethylhexylthio)thiophen- 2-yl)benzo[1,2-b:4,5-b′]-dithiophene] (PBDTT-S) and PC71BM. We confirmed the changes in the work functions of ZnO using ultraviolet photoelectron spectroscopy. The measured work functions of ZnO were –4.32 and –4.21 eV when P1 and P2 were used as the interlayer, respectively; these values are slightly higher than that of bare ZnO (–4.42 eV). One of the devices fabricated with P2 showed a maximum power conversion efficiency of 4.37%, which is higher than that of the device without a CPE interlayer (3.76%).
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Keywords: Conjugated Polyelectrolyte; Interlayer; Organic Photovoltaic Cells; Work Function

Document Type: Research Article

Affiliations: 1: Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea 2: Advanced Materials Division, Korea Research Institute of Chemical Technology (KRICT), Daejeon 305-600, 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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