Abstract
A series of semisquaric acids were examined as sensitizers for the zinc oxide solar cell prepared by a one-step cathode deposition template method. Their cell performance was rather low due to high oxidation potential ( E ox) of semisquaric acids. However, the performance was improved by introducing long alkyl group on the nitrogen atom at the heteroaromatic moiety. A N-octadecylindolium derivative showed the best performance: the incident photon-to-current efficiency (IPCE) 38.0% at absorption maximum ( λ max) 423 nm, short circuit photocurrent density ( I sc) 1.116 mA cm −2, open circuit photovoltage ( V oc) 0.421 V, fill factor (ff) 0.57, and solar-light-to-electricity conversion efficiency ( η) 0.27%, respectively.
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