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Yun, Hyeong Jin,Paik, Taejong,Edley, Michael E.,Baxter, Jason B.,Murray, Christopher B. American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.5
<P>Enhancement of the charge transfer rate in CdSe quantum dot (QD) sensitized solar cells is one of the most important criteria determining cell efficiency. We report a novel strategy for enhancing charge transfer by exchanging the native, long organic chain to an atomic ligand, S<SUP>2–</SUP>, with a simple solid exchange process. S<SUP>2–</SUP>-ligand exchange is easily executed by dipping the CdSe QDs sensitized photoanode into a formamide solution of K<SUB>2</SUB>S. The results show that this exchange process leads to an enhancement of the electronic coupling between CdSe QD and TiO<SUB>2</SUB> by removing the insulating organic barrier to charge transfer, while maintaining its quantum confined band structure. This treatment significantly increases the charge transfer rate at the interfacial region between CdSe QDs and TiO<SUB>2</SUB> as well as between the CdSe QDs and Red/Ox coupling electrolyte, as verified by time-resolved photoluminescence and electrochemical impedance spectroscopy measurements. Finally, the S<SUP>2–</SUP>-treated photoanode exhibits a much higher photovoltaic performance than the conventional MPA or TGA-capped CdSe QDs sensitized solar cell. The findings reported herein propose an innovative route toward harvesting energy from solar light by enhancing the carrier charge transfer rate.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-5/am500026a/production/images/medium/am-2014-00026a_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am500026a'>ACS Electronic Supporting Info</A></P>