Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Publication date: 7th November 2016
Despite the rapid improvement in the device efficiency of organic-inorganic lead (Pb) halide perovskite solar cells (PVSCs) in the past years, the use of toxic Pb may severely limit their broad applications and commercialization.The development of Pb-free or less Pb PVSCs is highly desirable and has drawn extensive attention. Methylammonium tin iodide (MASnI3) based Pb-free PVSCs with PCEs of around 6% have been reported in 2014, which have stimulated considerable follow-up studies on Pb-free Sn-based PVSCs. However, since 2014, no further improvement in the PCE of Pb-free Sn-based PVSCs was reported. We report on the fabrication of efficient Pb-free planar Sn-based PVSCs, which consist of formamidinium tin triiodide (FASnI3) as the light absorber. Along with solvent engineering, the use of tin fluoride additives is critical for synthesizing highly uniform and pinhole-free compact FASnI3 perovskites with a suitable carrier density. Our Pb-free FASnI3 PVSCs have achieved PCEs higher than 6%, exhibiting very little J-V hysteresis and high reproducibility. Furthermore, using a new precursor combining a FASnI3 precursor with a MAPbI3 precursor, we are able to deposit high-quality mixed Sn-Pb thin films, which, in turn, enables us to fabricate efficient low-bandgap mixed Sn-Pb PVSCs. The composition of the thin films is controlled by the molar ratio of MAPbI3 to FASnI3 precursors, giving a formula of (FASnI3)1-x(MAPbI3)x. The lowest bandgap, ~1.2 eV, was obtained with x = 0.4. With this Pb content, our mixed Sn-Pb perovskite solar cells have achieved PCEs over 15%. For both Pb-free and less Pb perovskite solar cells, an inverted structure of glass/ITO/PEDOT:PSS/perovskite/C60/BCP/Ag is used. It was noticed that the lithium (Li) and/orcobalt (Co) salts used as dopants in organic hole selective layers may damage Sn-containingperovskites. The use of the inverted cell structure avoids this problem and palys a key role for successfully fabricating efficient Sn-free and less Pb mixed Sn-Pb perovskite solar cells.
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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.