Abstract
Two side-chain substituted poly(di-2-thienylthienopyrazine)s (PBEHTT and PTBEHT) are used as electron donor together with phenyl-C61 butyric acid methyl ester (PCBM) as an electron acceptor in low-band gap bulk heterojunction polymer solar cells. These low-band gap polymers absorb light up to ∼1μm. Under simulated AM1.5 conditions PTBEHT:PCBM devices provide a short circuit current of Jsc=3.5mA∕cm2, an open circuit voltage of Voc=0.56V, and a power conversion efficiency of η=1.1%. Photoresponse up to 1μm has been observed with external quantum efficiencies exceeding 15% in the 700–900nm region.
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