L R AS Published on Tuesday 12 April 2022 - n° 401 - Categories:R&D
In brief R & D :
In brief R & D :
aluminium-nickel (Al-Ni) molten salt battery
carbon-based perovskite solar cell without hole transport layer
perovskite solar cell based on an inverted structure that has achieved an efficiency of 23.9
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Scientists at the US Department of Energy have developed an aluminium-nickel (Al-Ni) molten salt battery that is capable of retaining 92% of its initial capacity over periods of 12 weeks, with a theoretical energy density of 260 W/hour per kg. It's a bit like the battery switching off its self-charging function when it's at rest: the battery is charged by heating it to around 180 C, with its ions circulating in the liquid electrolyte. The device is then brought back to room temperature and the electrolyte becomes solid, trapping the ions that carry the stored energy.
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An international research team has designed a carbon-based perovskite solar cell without a hole-transporting layer, achieving an efficiency of 26%. This is a new design for perovskite solar cells without a hole transport layer (HTL), using carbon-based materials to replace the metal contact and HTL.
According to the team, these results pave the way for high efficiencies in carbon-based perovskite solar cells.
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Canadian scientists have fabricated a perovskite solar cell based on an inverted structure that achieved an efficiency of 23.9% and retained 92% of its initial performance after 500 hours of accelerated ageing tests. By carefully controlling the thickness of the perovskite layer, the group was also able to gain control over 'quantum mechanical' properties such as the movement of electrons in the layer and the wavelengths of light absorbed.
