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ABSTRACT: Small molecules, namely DCAO3TBDT and DR3TBDT, with 2.ethylhexoxy substituted BDT as the
central building block, octyl cyanoacetate and 3.ethylrhodanine as different terminal units with the same linkage of
dioctyltertthiophene, have been designed and synthesized. The photovoltaic properties of these two molecules as donors
and fullerene derivatives as the acceptors in bulk heterojunction solar cells are studied. Among them, DR3TBDT shows
excellent photovoltaic performance and power conversion efficiency as high as 7.38% (certified 7.10%) under AM 1.5G
irradiation (100 mWcm.2) has been achieved using the simple solution spin.coating fabrication process, which is the
highest efficiency reported to date for any small molecule based solar cells. The results demonstrate that structure fine
turning could cause significant performance difference and with that, the performance of solution processed small
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