Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
The past few years have witnessed an explosive development of organic-inorganic metal halide perovskite (OMHPs) solar cells. Much attention has been devoted to material preparation, device fabrication and performance. However, relatively few studies are focusing on the fundamental properties of this material. In particular, the relationship between on one hand the structure and morphology and on the other hand the charge carrier dynamics including the lifetime, and mobility. OMHP single crystals form an ideal platform to study these aspects, since grain boundaries and intraband-gap states are largely reduced. In this work orthorhombic CH3NH3PbBr3 single crystals are studied by the photo-induced time resolved microwave conductance (TRMC) technique, which allows determination of the carrier mobility and lifetime along different axes of the crystal. By varying the wavelength the light penetration depth and hence the local charge carrier concentration can be changed. TRMC traces recorded using 500 nm wavelength show a much faster decay than using 570 nm, which is attributed to higher order recombination processes like band-to-band recombination. At 570 nm charge carrier lifetimes in excess of 1 microsecond are found. In addition, the mobility along one crystal axis is about a factor of two lower than along the other directions. These observations are compared with results from band structure calculations.
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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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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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