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Reducing Mass-Transport Limitations in Cobalt-Electrolyte-Based Dye-Sensitized Solar Cells by Photoanode Modification
Ist Teil von
Chemphyschem, 2014-04, Vol.15 (6), p.1216-1221
Ort / Verlag
Weinheim: WILEY-VCH Verlag
Erscheinungsjahr
2014
Link zum Volltext
Quelle
Wiley-Blackwell Journals
Beschreibungen/Notizen
Mass transport has been identified as a limiting problem in the photovoltaic performance of dye‐sensitized solar cells based on electrolytes consisting of ionic liquids or cobalt complexes. A mixed TiO2 macroporous–mesoporous morphology employed as photoanode is demonstrated to assist the diffusion of electrolytes with higher viscosity or consisting of bulky redox mediators, such as cobalt di‐tert‐butyl bipyridine [Co(dtb)3]2+/3+. This morphology with large pores improves the non‐linearity of photocurrent response to light intensity indicating better diffusion. The incorporated sub‐micrometer pores also reduce recombination and decrease diffusion resistance, as revealed by electrochemical impedance spectroscopy.
Sub‐micrometer pores are incorporated in the mesoporous TiO2 film of a dye‐sensitized solar cell to create a network of bimodal pore sizes. The large pores assist the diffusion of bulky Co(dtb)2+/3+ ions in the cobalt electrolyte, reduce the diffusion resistance, and improve the photocurrent at high light intensity.