Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Publication date: 7th November 2016
The electronic properties of nanostructured photoelectrodes have a strong influence on the efficiency of converting light to an electrical current in a variety of devices such as, for example, dye-sensitized solar cells and solar water splitting systems. In these mesoporous, nanostructured electrodes, charge transport and recombination can generally be described using a continuity equation incorporating activated diffusion-limited charge transport and charge density-dependent recombination. In a two-electrode configuration, the photoelectrodes are often represented by a diode equation including non-ideal behavior related to the influence of traps in both processes. In the analysis of the current - voltage curve, a 100% collection efficiency is generally assumed, which appears to be confirmed by small-signal perturbation methods, such as electrochemical impedance spectroscopy (EIS). However, related to the particular properties of mesoporous, nanostructured materials in a high ionic strength medium, the quasi-Fermi level of electrons in the photoelectrode is not equal to the Fermi level of the conducting oxide substrate under short-circuit conditions, and a significant driving force for recombination is present. By a careful analysis of these processes, we have found that the charge collection efficiency determined from small-perturbation methods is significantly overestimated if recombination under short-circuit conditions cannot be neglected, and this effect becomes more pronounced with increasing recombination losses. We propose a simple method to detect whether recombination losses under short-circuit conditions are important.
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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.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
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