Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Semiconducting polymers have been used in a diverse range of applications, such as in organic light emitting diodes (OLEDs), organic photovoltaic cells (OPVs) and organic thin film transistors (OTFTs) for several decades. OPVs have drawn significant attention for these applications due to the global technology trends toward economic feasibility and continuous development coupled with efforts to preserve the environment. To improve the charge transport between the interfaces, a number of investigations to study the effects of introducing an interlayer have been reported recently. In particular, most research efforts have focused on the use of alcohol/water-soluble conjugated polymer electrolytes (CPEs) for the interlayer.In this study, we synthesized alcohol/water-soluble small molecules with n-type backbones. We introduced various nematic molecules into the backbone to achieve effective charge transfer between the interfaces and ordered orientation. Due to the effective charge transfer and ordered orientation, improved FF, JSC, VOC and PCE values are expected in these OPVs.The synthesized molecules were dissolved in organic solvents and highly polar solvents. The QT film exhibited strong shoulder peak at approximately 454 nm compared with the solution, which was due to the ordered orientation of QT. According to XRD measurements, a prominent diffraction peak at 20 ° was observed in the in-plane diffraction pattern of QT, which indicates an out-of-plane peak (010) due to the molecular packing by π-π stacking. A photovoltaic device containing QT exhibited an open-circuit voltage of 0.71 V, a current density of 13.6 mA/cm2, a fill factor of 69.2 % and a power conversion efficiency of 7.3%.
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