Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Energy levels of new metal-free organic dyes for dye-sensitized solar cells have been investigated by the photoemission in air, UV-Vis absorption and cyclic voltammetry methods in solutions, in films of sole dyes and in adsorbed on nanoporous TiO2 dye molecules. Significant differences of the energy levels have been found depending on the dye environment. For the best level tuning in a solar cell, the energy levels are to be determined for the dyes adsorbed on the TiO2 surface. The absorbed photon conversion to current efficiency (APCE) of the solar cells was evaluated and compared with the incident photon quantum efficiency (IPCE).
The results of these investigations show that both the HOMO and LUMO values of the dyes used in SC are dependent on the aggregate state of the dyes. Energy levels differ quite noticeably depending upon the measurement conditions. For this reason the ionization potential and electron affinity of the dyes adsorbed on nanoporous TiO2 should be evaluated.
The results obtained show that IPCE is dependent on light quanta energy and reaches maximum value at the light quanta energy about 0.3 eV higher than the light absorption threshold.
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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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