Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Recent literature provides a constant stream of new recipes and processing techniques, leading to improved power conversion efficiencies for photovoltaics (PVs), although often with limited detailed understanding of the mechanisms for performance improvement. Additive engineering and stoichiometric variations are particularly interesting in terms of optimizing performance levels within solar cells and related devices. However, the underlying impact of additives and stoichiometry on film grain structure, transport, and recombination properties is often not well understood. This talk will address our group’s recent efforts to examine shoichiometry control and additive engineering in the model system CH3NH3PbI3, using a variety of tools, including a new carrier-resolved photo-Hall (CRPH) technique [1,2] and in-situ X-ray and photoluminescence characterization during film deposition [3,4]. In particular, the CRPH approach [1] provides unique insights into the majority and minority carrier properties, as a function of light intensity and using the same sample and measurement. A second direction for the talk will involve another important aspect of additive engineering, namely doping (Fermi level control). A recent study [5] has demonstrated the careful selection of molecular dopant and perovskite band positions to enable five orders of magnitude control over conductivity and carrier density in a mixed-metal CH3NH3Sn0.5Pb0.5I3 perovskite. Such fundamental studies related to grain structure, defect properties and doping are expected to provide an enhanced degree of control over semiconducting properties for PV and related optoelectronic devices.
This work was supported by the National Science Foundation under grants DMR-2004869 and DMR-1709294, as well as by the Center for Hybrid Organic-Inorganic Semiconductors for Energy (CHOISE), an Energy Frontier Research Center funded by the Office of Basic Energy Sciences, Office of Science within the U.S. Department of Energy through contract number DE-AC36-08G028308.
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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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