Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.142
Publication date: 21st February 2018
Overcoming the limitations of redox mediator mass transport and electron back recombination, within the mesoporous TiO2 photoelectrode, remains a fundamental challenge for ongoing dye-sensitised solar cell (DSSC) research. This is even more critical for the engineering of commercially viable and long-term stable DSSCs, which inevitably requires more robust and viscous electrolytes that tend to suffer from significant mass transport issues. Our work provides new insights into the recombination kinetics inside the TiO2 photoelectrode, and presents useful strategies for mitigating electron recombination. We developed a simple yet powerful method to investigate the spatial recombination kinetics across the cross-section of the TiO2 photoelectrode, by simply measuring photocurrent transients as a function of the photogeneration profile. Essentially, non-uniform light absorption across the photoelectrode is exploited in order to study the relative spatial photogeneration profile of oxidised redox mediators inside the TiO2. Using this approach, we show that accumulation of the redox mediator can gradually occur inside the mesoporous photoelectrode, which can result in non-linear recombination kinetics and J-V hysteresis. The novel findings in our work should be broadly relevant to ongoing DSSC and related photoelectrochemical solar cell research.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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