Synthesis and design of donor-acceptor type polymers for improvement of performance in organic solar cells
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Organic photovoltaics (OPV) has been considered to be a promising candidate for next-generation technology platforms to meet ever-growing demands for sustainable energy, owing to its many advantages such as low cost, large area, ultra-weight and solution processing.[1] A donor–acceptor type p-conjugated polymer based on fluorinated 4,7-di-2-thienyl-2,1,3-benzothiadiazole (DTBT) as an electron accepting unit and 6-(2-thienyl)-4H-thieno[3,2-b]indole as an electron donating unit were designed and successfully synthesized. Fluorine atom was introduced into the conjugated polymer to improve the efficiency of organic solar cells, owing to its strong electron-withdrawing property. The copolymer exhibited relatively wide bandgaps with deep highest occupied molecular orbital (HOMO) energy levels. A device based on PTTIF2:PCBM (1:1w/w) blend with chloro-naphthalene (CN) additive gives a PCE of 4.36%. [1] Su, Y.-W; Lan, S.-C.; Wei, K.-H. Organic photovoltaics. Mater. Today, 2012, 15, 554-562.