Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
The performance and lifetime of organic and hybrid solar cells are strongly affected by the formation of defects during the fabrication process. Understanding and managing these defects is critically important if printed solar cells are to become a commercially viable technology. This work develops transient photovoltage/photocurrent (TPV/TPC) measurements as a spatially-resolved mapping technique which provides unique insights for the characterisation of defects in terms of the charge carrier dynamics.
TPV and TPC measurements considering a whole device are routinely used for analysing charge carrier dynamics in order to understand the operation of organic and hybrid solar cells. Adapting this technique for mapping (~ 50 μm resolution) introduces a number of challenges, particularly related to the interpretation of results. We address this by developing a 2D finite element model of the sample to simulate the measurement and comparing the simulated results to experimental data in order to validate our interpretation. In this way we are able to identify local variation in charge recombination and extraction dynamics correlated with various types of defects in the printed solar cell. We apply this technique to both organic polymer and organic-inorganic hybrid perovskite devices. This novel approach enables us to probe the mechanisms by which different defects affect the performance of photovoltaic devices, as well as the magnitude of their impact. Information of this kind provides a basis for the defect management strategies that must be developed for the successful scale-up of printed solar cells.
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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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