Abstract
Two new small molecules, namely DRSBDTT-EH and DRSBDTT-BO, with alkylthio thienyl substituted benzodithiophene as the central unit and 3-ethylrhodanine as end groups, were designed and studied as the donors for solution processed organic solar cells. The optimized device based on DRSBDTT-EH bearing shorter alkylthio chain gave a power conversion efficiency (PCE) of 8.78%, which is slightly higher than that of device (8.53%) based on DRSBDTT-BO with longer alkylthio chain.
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