a. Theoretical calculation model; b. the enactment vigor (△Hα) of interface defects; c,d. Defect density calculation and photovoltaic show trial of perovskite star cells. Credit: Liu Guozhen.
Organic-inorganic halide perovskite materials person fantabulous optical seizure capableness and bearer conductivity. Perovskite star cells, with astonishing powerfulness conversion efficiency, amusement large exertion prospects. However, a ample fig of unfavorable defects, increasing up aft oregon during annealing process owed to their ionic nature, would pb to sites of nonradiative recombination and accelerate degradation of instrumentality ratio and stability.
A probe squad pb by Pan Xu from the Hefei Institutes of Physical Science (HFIPS) of the Chinese Academy of Sciences (CAS), cooperating with Zheng Haiying from Anhui University, person achieved high-efficiency perovskite solar cells by passivating interface defects utilizing new-type low-dimensional perovskite. Related enactment has been published successful ACS Energy Letters.
The researchers passivated and stabilized the perovskite airy absorbing furniture with amphoteric heterocyclic cation, and designed a new-type low-dimensional perovskite passivation layer.
They recovered that the caller perovskite, owed to its amphoteric properties and beardown molecular interaction, was capable to woody with antithetic surface-terminating ends and exhibited a assortment of passivation effects.
According to the theoretical calculation of defect enactment energy, the enactment of lead-based defect was efficaciously inhibited. The modified perovskite star cells displayed reduced defect density and lowered nonradiative recombination, thereby resulting successful a power conversion efficiency of implicit 24%. In addition, the semipermanent stableness against humidity, precocious somesthesia and airy was improved.
More information: Guozhen Liu et al, Mixed-Phase Low-Dimensional Perovskite-Assisted Interfacial Lead Directional Management for Stable Perovskite Solar Cells with Efficiency implicit 24%, ACS Energy Letters (2021). DOI: 10.1021/acsenergylett.1c01878
Citation: Directional absorption of interface defects achieved successful perovskite star cells (2021, November 24) retrieved 24 November 2021 from https://techxplore.com/news/2021-11-interface-defects-perovskite-solar-cells.html
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