Abstract
We report the synthesis and photovoltaic properties of a donor–acceptor polymer, poly(naphthobisthiadiazole-triphenylamine) [poly(NTD-TPA)], which consists of TPA as a donor unit and NTD as a stronger acceptor than benzothiadiazole. This polymer had an absorption edge at wavelengths up to 610 nm. The optimized bulk-heterojunction (BHJ) organic photovoltaic (OPV) cell using poly(NTD-TPA) and [6,6]-phenyl C71 butyric acid methyl ester (PC70BM) exhibited a short-circuit current of 6.87 mA cm−2, an open-circuit voltage Voc of 0.79 V, a fill factor of 0.40, and a power conversion efficiency of 2.15%. The validities of these photovoltaic properties are discussed using the incident-photon-to-current conversion efficiency, film morphology, field-effect hole mobility, and electroluminescence (EL) spectrum from the charge transfer states between the highest occupied molecular orbital of poly(NTD-TPA) and the lowest unoccupied molecular orbital of PC70BM. In particular, the Voc estimated from the current density–voltage curve agreed well with that estimated from the peak energy of the EL spectra.
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