Abstract
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 0.92V was obtained from the PSC devices based on PBDTT-OS-TT-EF. Particularly, the Voc of PSC device based on PBDTT-OS-TT-CF is as high as 1.00V, which is the highest value for the devices based on TT-base polymers. The results indicate that the engineering two electron-donating side chains in BDTT unit is an effective strategy to narrow the band-gap and manipulate the energy levels of polymers, which can be potentially applied to design polymer donor materials with high Voc values.
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