Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Publication date: 7th November 2016
Issues on stability and durability of hybrid perovskites are dramatically delaying the large dissemination of low cost/high yield related technologies for photovoltaic, light sensing and emitting purposes. While several combinations of cations and anions are under investigation to solve the issues, the advance of the technologies is currently forced to pass through the rationalization of the phenomena occurring into the hybrid lattice under conditions which mimic the material operation. In this framework, we study the structural modifications of the MAPbI3 lattice upon recursive thermal cycles from 30°C to 80°C in different annealing environments. Although it is known that the MAPbI3 lattice structure changes from tetragonal to cubic above 60°C, here we demonstrate the existence of a temperature-dependent order parameter which pilots a continuous lattice modification by approaching the transition temperature. This modification involves the entire lattice through the progressive change of the rotational state of the organic MA+ cations that gradually gain a z component out of the starting x-y bidirectional ordering, culminating in the symmetrization of the three crystallographic axes after full MA+ randomization (T~60°C). We reveal that this order-disorder transition opens a weakness-point in the structure that facilitates the access of external species into the cage. This has irrelevant effects in presence of N2 molecules, but dangerous impacts in air. Our findings extend to predict the transition temperature to be critical also with regards to the diffusion of atomic species from boundary materials and indeed invoke tailored solutions.
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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.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.