Directional management of interface defects achieved in perovskite solar cells

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a. Theoretical calculation mannequin; b. the formation power (△Hα) of interface defects; c,d. Defect density calculation and photovoltaic efficiency check of perovskite solar cells. Credit: Liu Guozhen.

Organic-inorganic halide perovskite supplies have glorious optical seize capability and provider conductivity. Perovskite solar cells, with wonderful energy conversion effectivity, present nice utility prospects. However, a big quantity of unfavorable defects, rising up after or throughout annealing course of as a result of their ionic nature, would result in websites of nonradiative recombination and speed up degradation of system effectivity and stability.

A analysis group lead 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, have achieved high-efficiency perovskite by passivating interface defects utilizing new-type low-dimensional perovskite. Related work has been printed in ACS Energy Letters.

The researchers passivated and stabilized the perovskite mild absorbing layer with amphoteric heterocyclic cation, and designed a new-type low-dimensional perovskite passivation layer.

They discovered that the brand new perovskite, as a result of its amphoteric properties and powerful molecular interplay, was in a position to take care of totally different surface-terminating ends and exhibited a spread of passivation results.

According to the theoretical calculation of defect formation power, the formation of lead-based defect was successfully inhibited. The modified solar cells displayed diminished defect density and lowered nonradiative recombination, thereby ensuing in a of over 24%. In addition, the long-term stability in opposition to humidity, excessive temperature and light-weight was improved.

Perovskite solar cells with atomically coherent interlayers on SnO₂ electrodes

More info:
Guozhen Liu et al, Mixed-Phase Low-Dimensional Perovskite-Assisted Interfacial Lead Directional Management for Stable Perovskite Solar Cells with Efficiency over 24%, ACS Energy Letters (2021). DOI: 10.1021/acsenergylett.1c01878

Directional management of interface defects achieved in perovskite solar cells (2021, November 24)
retrieved 24 November 2021

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