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Two electron-donating sides chain (octylthio and methoxy) were strategically attached on BDTT unit to develop two new polymers (PBDTT-OS-TT-EF and PBDTT-OS-TT-CF) as donor materials for polymer solar cells. PBDTT-OS-TT-EF and PBDTT-OS-TT-CF show broad absorption spectra with narrow optical band-gap of 1.52 and 1.56eV, and low-lying HOMO energy level of −5.34 and −5.46eV, respectively. A high Voc of...
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