Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Organic small molecule photovoltaics are currently at the transition from lab to fab. Therefore, not only the efficiency itself should be considered but also the performance and ageing behavior of organic solar cells under realistic, i.e. outdoor conditions. For outdoor measurements, the simultaneous influence of temperature, illumination intensity, irradiance spectrum, angle of incidence and direct or diffuse irradiation as well as raindrops, dirt or snow is determining the harvesting of energy in the solar cells and will lead to differences compared to standard test conditions (STC). A yield factor in Wh/Wp can be calculated for the investigated tandem mini-modules for the given time and measurement location. In addition, the dependency on several of the above mentioned parameters is presented and compared to measurements in the lab. The results show that mainly a correction for temperature effects is necessary to compare various outdoor measurements with each other at similar irradiation conditions.
Realistic predictions of the solar cell performance must also take degradation into account. Therefore, outdoor data of mini-modules with an active area of 27 cm² on flexible plastic substrates are presented. The module aged for the longest time still shows around 90 % of its initial efficiency after 7 months on the roof. For other modules where degradation is ongoing due to failures in the encapsulation, measurements of the pseudo-J-V-curve and imaging techniques like electroluminescence were carried out, pointing on the Aluminum top contact as a likely site for degradation.
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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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