Journal of Materials Chemistry A p. 6949 - 6960 (2013)
Update date:2022-08-03
Topics:
Planells, Miquel
Abate, Antonio
Hollman, Derek J.
Stranks, Samuel D.
Bharti, Vishal
Gaur, Jitender
Mohanty, Dibyajyoti
Chand, Suresh
Snaith, Henry J.
Robertson, Neil
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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