Abstract
We report all-polymer solar cells with new electron-accepting (n-type) polymer nanoparticles, poly(2,7-bis(4-hexylthiophen-2-yl)-9H-fluoren-9-one-co-benzothiadiazole) (BHTF-co-BT), which were in-situ generated during polymerization reaction. The size of the BHTF-co-BT nanoparticles was ca. 5–15nm with a particular single X-ray diffraction peak (d-spacing=1.3nm), indicative of a highly ordered crystalline state, while their glass transition temperature was ~140°C. Their band gap energy and ionization potential were 1.8eV and 5.7eV, respectively. The possibility of the BHTF-co-BT nanoparticles as an electron acceptor for both normal-type and inverted-type all-polymer (polymer:polymer) solar cells was examined by employing poly(3-hexylthiophene) (P3HT) as an electron donor. The normal-type P3HT:BHTF-co-BT solar cells exhibited promising open circuit voltage (Voc=0.67–0.73V) and fill factor (FF=51.3%), while a three-fold improved short circuit current density and higher Voc (0.77V) were achieved for their inverted-type solar cells.
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