Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Perovskite based solar cells have attracted immense interest in the last years due to their remarkable photo-electron conversion efficiency and ease of processing. Several works have appeared to elucidate their working principles. However factors governing the performance are still poorly understood and many questions arise regarding device operation. More importantly, there is a lack of a clear understanding of processes governing the cell such as the mechanism of transport within the perovskite layers, the role of the selective contacts on transport and/or charge extraction, or the characteristics of the recombination losses. In this work we have adopted different device configurations, including nanostructured and thin film devices, based on different CH3NH3PbX3 compositions deposited by sequential deposition or single step processes. A comprehensive study of the electron transport and recombination of those devices have been carried out by combining several characterization techniques. These techniques include small perturbation methods such as impedance spectroscopy (EIS) and intensity-modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS), and also open circuit voltage decay (OCVD) measurements. By comparing electron lifetimes as a function of voltage obtained from IMVS with those obtained by impedance and OCVD measurements, good agreement in results was found (Figure 1). Electron and hole transport has been studied by impedance spectroscopy and IMPS. IMPS measurements reveal that there are two transport constants which show an opposite dependence with respect to voltage. The recombination resistance obtained from EIS shows an exponential behavior, with a beta factor smaller than one. A comprehensive analysis by different characterization techniques of the recombination and electron transport processes in perovskite solar cells together with a cross-correlation and comparison between different cell configurations help us to identify the limiting factors for efficiency in this type of cells.
Comparison of electron lifetimes for a perovskite solar cell obtained by different characterization techniques.
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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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