Shielding effects of additives in a cobalt(ii/iii) redox electrolyte: Toward higher open-circuit photovoltages in dye-sensitized solar cells
Journal of Materials Chemistry A, ISSN: 2050-7496, Vol: 2, Issue: 27, Page: 10532-10539
2014
- 20Citations
- 18Captures
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Article Description
We report the molecular interactions between cobalt tris(bipyridyl) [Co(bpy)] and additives of 4-tert-butylpyridine (TBP) in a redox electrolyte and the effects on the performance of dye-sensitized solar cells (DSCs). The interactions and consequent effects led us to the concept of a TBP-shielded [Co(bpy)] complex, where the [Co(bpy)] ion was surrounded by TBP molecules via weak ion-dipole attractions. The TBP molecules were able to bi-functionally shield both [Co(bpy)] ions and the TiO surface from undesirable charge recombination, achieving a greater enhancement of open-circuit voltage (V) of about 200 mV than 140 mV in the iodide (I/I) system where TBP passivated the TiO surface only. The V-J trade-off problem was thereby mitigated. Our discovery of the molecular interactions between additives and redox species would stimulate the engineering of new additives or redox mediators to improve the performance of DSCs. © 2014 the Partner Organisations.
Bibliographic Details
Royal Society of Chemistry (RSC)
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