Abstract
A new and novel organic π-conjugated chromophore (named as RCNR) based on fumaronitrile-core acceptor and terminal alkylated bithiophene was designed, synthesized and utilized as an electron-donor material for the solution-processed fabrication of bulk-heterojunction (BHJ) small molecule organic solar cells (SMOSCs). The synthesized organic chromophore exhibited a broad absorption peak near green region and strong emission peak due to the presence of strong electron-withdrawing nature of two nitrile (–CN) groups of fumaronitrile acceptor. The highest occupied molecular orbital (HOMO) energy level of –5.82 eV and the lowest unoccupied molecular orbital (LUMO) energy level of –3.54 eV were estimated for RCNR due to the strong electron-accepting tendency of –CN groups. The fabricated SMOSC devices with RCNR:PC60BM (1:3, w/w) active layer exhibited the reasonable power conversion efficiency (PCE) of ~2.69% with high short-circuit current density (JSC) of ~9.68 mA/cm2 and open circuit voltage (VOC) of ~0.79 V.
Highlights
Efficient approach since these molecules could increase an absorption band through intramolecular charge transfer (ICT) for better match-up of the solar spectrum and attain the high PCE in organic solar cells devices[17,18,19]
We report the synthesis and organic photovoltaic characteristics of a novel and efficient D–A–D type (Fig. 1) fumaronitrile-based organic π -conjugated chromophore, 2,3-bis(4-(5-(5-hexylthiophen-2-yl)thiophen-2-yl)phenyl) fumaronitrile
The thermal stability of the synthesized organic chromophore, RCNR has been analysed by the thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) under N2 atmosphere
Summary
Efficient approach since these molecules could increase an absorption band through intramolecular charge transfer (ICT) for better match-up of the solar spectrum and attain the high PCE in organic solar cells devices[17,18,19]. To achieve organic compounds with –CN group for PSCs is still a challenge and more efforts are needed to explore the fundamental aspect of –CN-group based D− A systems for high performance devices[28]. In this regard, a new, symmetrical D–A–D organic semiconductor framework is designed with the fumaronitrile (FN) as an electron-withdrawing moiety and utilized in solution-processed SMOSCs. In this study, we report the synthesis and organic photovoltaic characteristics of a novel and efficient D–A–D type (Fig. 1) fumaronitrile-based organic π -conjugated chromophore, 2,3-bis(4-(5-(5-hexylthiophen-2-yl)thiophen-2-yl)phenyl) fumaronitrile (named as RCNR). The photovoltaic characteristics are significantly influenced by the self-assembly behaviour of RCNR due to the existence of different liquid-crystal phases
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