Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Mixed halide hybrid perovskites have taken the optoelectronics community by storm ever since their first application as light absorbers in dye sensitised solar cells in 2009. Efficiencies of current hybrid perovskite based solar cells and LEDs have exceeded 22% and 10%, respectively. The surge in interest and research activity can be ascribed not only to their high efficiencies, but also to their facile wet chemical processing and tunability of the bandgap through the precursor stoichiometry. In the case of the prototypical hybrid perovskite CH3NH3Pb(BrxI1-x)3, the bandgap can be tailored by changing the Br to I ratio. However in thin films it has long been suspected that irradiation with light causes reversible demixing of the original alloy into I- and Br-rich domains. This has been observed using photo- and cathodo-luminescence, as well as time-of-flight secondary ion mass spectroscopy. Despite the numerous observations and proposed mechanisms, a conclusive explanation of the phenomenon has not been put forward. Here we present a systematic study of the phase changes in different compositions of CH3NH3Pb(BrxI1-x)3, using low temperature powder X-ray diffraction and heat capacity measurements. This allows us to track distortions and their associated energies in the crystal lattice, which can be used to reveal any order-disorder transitions. The present work focuses on the material under dark conditions. Additionally, the experimental setup for future low temperature measurements under illumination is also outlined.
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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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