Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Comprehension of the atomic structure of hybrid perovskite materials in bulk crystals and thin films is crucial for understanding their function in devices. However, challenges arise both from the structural complexity of these materials and from the limitations of conventional diffraction techniques. We have demonstrated neutron powder diffraction (NPD) to be a powerful method for investigating the atomic structure of hybrid materials, including light atom and hydrogen positions. The perovskite α-phase of formamidinium lead iodide is shown to be cubic (a = 6.3620(8) Å) at room temperature, rather than trigonal as previously described, using high resolution powder diffraction at HRPD, ISIS.1 The full structure of methylammonium lead iodide across orthorhombic (Pnma, <165 K), tetragonal (I4/mcm) and cubic (Pm-3m, >327 K) phases has been refined from NPD data collected on D20 at ILL, including the evolution of the methylammonium cation from hydrogen bonding with the [PbI3]- framework to fully orientationally disordered in the cubic phase.2 Novel hybrid compounds of interest for optoelectronic applications and the solid solution series MAxFA1-xPbI3 have been synthesised and analysed by laboratory X-ray diffraction and allied spectroscopic techniques.3 The implications of these results for understanding the behaviour of hybrid materials within photovoltaic cells will be presented.
1) M. T. Weller, O. J. Weber, J. M. Frost, and A. Walsh, J. Phys. Chem. Lett., 2015, 6, 3209–3212.
2) M. T. Weller, O. J. Weber, P. F. Henry, A. M. Di Pumpo, and T. C. Hansen, Chem. Commun., 2015, 51, 4180–4183.
3) O. J. Weber, K. L. Marshall, L. M. Dyson, and M. T. Weller, Acta Crystallogr. B., 2015, 71, 668–78.
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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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