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Follow on Google News | Stability of cheap solar cells improvedBy: Austrian Science Fund FWF Lead-halide perovskites are the darling of solar cell research: the crystalline material is used for cost-effective manufacturing processes and, surpassing the 20% threshold, has already achieved enormous power conversion efficiencies in a comparatively short time. This material still has a fundamental drawback, however, and that is its instability. A recent discovery by an Erwin Schrödinger Fellow of the FWF, in cooperation with Aaron Fafarman and a team of researchers from Drexel University in Philadelphia, US, has now shown that this instability can be considerably reduced through high levels of doping with chloride ions. High doping levels David Egger, who is supported by a Schrödinger Fellowship and based at the Department of Materials and Interfaces of the Weizmann Institute of Science in Israel, together with his colleagues discovered that certain perovskites can hold high levels of chloride ions (doping) – and that this enhances the stability of the functional material under certain conditions by up to two orders of magnitude. Egger elaborates: "We examined cesium-lead- Presage From previous experiments on perovskites including chloride instead of iodide ions one could speculate that doping the material with chloride may enhance its stability. However, achieving this in practice proved to be extremely difficult. Egger and his colleagues chose an interdisciplinary approach to investigate whether chloride doping could have a positive effect on the stability of cesium-based perovskites: Surprising results When analysing the stability of the cesium-lead- The fundamental insight provided by Egger and his colleagues, supported by the Erwin Schrödinger Fellowship of the FWF, may now be used in new approaches to exploit the enormous potential of perovskite solar cells in even greater capacity. http://www.fwf.ac.at/ End
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