Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.020
Publication date: 21st February 2018
Dye-sensitized solar cells (DSCs) offer an attractive option as a third-generation photovoltaic technology due to their high-power conversion efficiency (PCE) and potential for low-cost power production as well as indoor (diffuse light) applications. To date, PCEs over 12% have been achieved by using organic donor-(π-linker)-acceptor (D-π-A) type of dyes as photosensitizers and Co(II/III) complexes as redox shuttles in liquid electrolytes. However, liquid electrolyte-based DSCs represent a risk of leakage problems associated with the volatile nature of a liquid solvent, which significantly impedes this type of solar cell for large-scale commercial applications. In order to resolve this issue, solid-state p-type organic hole-transport materials (HTMs), such as 2,2’,7,7’-tetrakis-(N,N-di-p-methoxyphenyl-amine)9,9’ spiro-bifluorene (Spiro-OMeTAD), was introduced as hole conductor to replace the liquid electrolyte in all-solid-state dye-sensitized solar cells (sDSC) by Bach et al. in 1998. Up to now, a record efficiency of 7.7% have been reported by using the organic dye LEG4, characterized by a high molar extinction coefficient, as the absorber and 1,1,2,2-tetracholoroethane (TeCA) doped Spiro-OMeTAD as the HTM. However, the efficiencies of all sDSCs are still far below the PCEs of liquid electrolyte-based DSCs. To the main reason is that the active nanoporous TiO2 layer of an all sDSC has been limited to less than 2.5 μm, resulting in incomplete light harvesting and consequently a low photocurrent of the devices. Therefore, the development of novel photosensitizers with very high molar extinction coefficients and broad absorption spectra to enhance the light harvesting efficiency rendering high PCEs in all sDSCs is a main target for improvement. In this talk, I will introduce our recent progress on the development of new organic photosensitizers for high performance all sDSCs.
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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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