Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.102
Publication date: 21st February 2018
The lifetime of photogenerated charge carriers is one of the most important parameters in solar cells, as it rules the recombination rate that defines the open circuit voltage and the required minimum extraction time. It is therefore also one of the most discussed factors in all photovoltaic research fields. Electrical characterization methods such as transient photovoltage (TPV), open circuit voltage decay (OCVD) and impedance spectroscopy are often employed to determine charge carrier lifetimes. These methods were however initially developed for thick solar cells with an indirect bandgap and are therefore not always directly transferable to many of the new generation thin film photovoltaic devices. All thin film solar cells such as those presented on this conference (dye sensitized, organics, PbS quantum dots as well as metal halide perovskites) are all necessarily relying on materials with a high absorption coefficient. A high absorption coefficient is from reasons of reciprocity relations however always linked with a high radiative rate constant and therefore an inherent very short charge carrier lifetime. A careful consideration of what is actually being measured via electrical means is therefore imperative, and also the incentive of this contribution. We will here evaluate both perovskite and organic solar cells and compare them to an ideal thick silicon diode. We first show that the problem of lifetime determination via electrical means arises from that the relaxation of spatially separated charges interferes substantially with the general lifetime assignment. We will finally provide a simple analytical expression outlining under what conditions relevant steady state bulk recombination lifetimes are electrically accessible in 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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