Different effect of the additional electron-withdrawing cyano group in different conjugation bridge: the adjusted molecular energy levels and largely improved …
Four organic sensitizers (LI-68–LI-71) bearing various conjugated bridges were designed
and synthesized, in which the only difference between LI-68 and LI-69 (or LI-70 and LI-71)
was the absence/presence of the CN group as the auxiliary electron acceptor. Interestingly,
compared to the reference dye of LI-68, LI-69 bearing the additional CN group exhibited the
bad performance with the decreased J sc and V oc values. However, once one thiophene
moiety near the anchor group was replaced by pyrrole with the electron-rich property, the …
and synthesized, in which the only difference between LI-68 and LI-69 (or LI-70 and LI-71)
was the absence/presence of the CN group as the auxiliary electron acceptor. Interestingly,
compared to the reference dye of LI-68, LI-69 bearing the additional CN group exhibited the
bad performance with the decreased J sc and V oc values. However, once one thiophene
moiety near the anchor group was replaced by pyrrole with the electron-rich property, the …
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