Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 23, Pages 6949-6960Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta11417a
Keywords
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Funding
- Engineering and Physical Sciences Research Council (EPSRC) APEX project
- Engineering and Physical Sciences Research Council [EP/H040218/2, EP/G049653/1, EP/F065884/1] Funding Source: researchfish
- EPSRC [EP/F065884/1, EP/G049653/1, EP/H040218/2] Funding Source: UKRI
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We have synthesized and characterized a series of triphenylamine-based hole-transport materials (HTMs), and studied their function in solid-state dye sensitized solar cells (ss-DSSCs). By increasing the electron-donating strength of functional groups (-H < -Me < -SMe < -OMe) we have systematically shifted the oxidation potential and ensuing photocurrent generation and open-circuit voltage of the solar cells. Correlating the electronic properties of the HTM to the device operation highlights a significant energy offset required between the Dye - HTM highest occupied molecular orbital (HOMO) energy levels. From this study, it is apparent that precise control and tuning of the oxidation potential is a necessity, and usually not achieved with most HTMs developed to date for ss-DSSCs. To significantly increase the efficiency of solid-state DSSCs understanding these properties, and implementing dye-HTM combinations to minimize the required HOMO offset is of central importance.
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