Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Organometallic halide perovskites CH3NH3BX3 (B= Pb, Sn, Ge; X = I, Br, Cl) have become one of the most promising semiconductors for solar cell applications, reaching power conversion efficiencies beyond 20%. However, and despite the enormous number of publications during the last years, this novel class of semiconductors still bears multiple challenges. One of them is the development of a reliable process allowing to study the fundamental photo-physical processes as a function of the crystal defects. In this study we discuss two associated aspects towards further understanding defects in perovskites: First, we present a detailed chemical study on the nature of the various impurities in CH3NH3I and explore their impact on the crystal formation. These impurities are found in all commercial provided precursor formulations. The detrimental role of the impurities is best demonstrated by comparing perovskite solar cell devices fabricated from impurity free precursors vs precursors containing different concentrations of impurities. A certain concentration of impurities turns out to be detrimental to facilitate the growth of large grained crystals, which is beneficial for the solar cell performance. This part gives insight into the rate determining steps for perovskite crystal growth and provides a basis for discussing alternative, ideally more reliable and reproducible high performance recipes for Perovskite solar cell processing. Second, we suggest crystalline perovskite particles as an ideal reference system to perform fundamental studies. We present size and band gap engineering for organo-lead perovskites crystallites with various shapes and sizes ranging from the 5 nm regime all the way to 1 cm size. Colloidal nano-crystals, micro-crystlline particles as well as single crystals are demonstrated with excellent purity and controlled shape and size. The structural, optical and photo-physical properties of these reference materials are investigated and analyzed as function of their size and shape.
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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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