A. Iwan, Bartosz Boharewicz, K. Parafiniuk
Sep 1, 2014
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Journal
Synthetic Metals
Abstract
Abstract Two air-stable, donor-type aromatic polyazomethines (PAZ) containing triphenylamine (TPA-3B) or phenylenevinylene (PPV-3B) moieties were synthesized and characterized by 1 H, 13 C NMR, FTIR, TGA, UV–vis, photoluminescence, electrochemical and spectroelectrochemical measurements, X-ray diffraction (XRD) and atomic force microscopy. The main goal is focused on the electronic application of the two polyazomethines in bulk heterojunction (BHJ) polymeric solar cells. The BHJ solar cells were fabricated with the configuration of ITO/PEDOT:PSS/PAZ:PCBM(or PC 71 BM)/Al, and the best performance was obtained for the active layer with PC 71 BM, applied as an acceptor. The device constructed with TPA-3B:PC 71 BM showed the power conversion efficiency 25 times of magnitude higher than PPV-3B:PC 71 BM measured using AM 1.5G solar simulator at 100 mW/cm 2 light illumination. In addition, in order to control the electrical properties of PAZ on the performance of organic solar cells impedance spectroscopy experiments were done before and after illumination. Moreover, the morphology of PAZ blended with PCBM (and PC 71 BM) was investigated by AFM. It was confirmed that both the polymer and fullerene derivatives structure plays an important role in the development of air-stable polymer solar cells.