Improving voc of lead halide perovskites solar cells by plasma treatment

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00644749" target="_blank" >RIV/68378271:_____/25:00644749 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Improving voc of lead halide perovskites solar cells by plasma treatment

Original language description

Recombination of electrons and holes at the defect states of perovskite absorber limits the power conversion efficiency of the organic-inorganic halide perovskite solar cells. Recently, with the help of in-situ PL and GIWAXS measurements, we have shown that the defects are formed mainly at the grain boundaries and surface.1,2 Therefore, it is necessary to selectively passivate surface and grain boundaries. It was shown that the removal of thin surface layers using mechanical,3 or laser4 polishing may improve the performance of perovskite thin films and PCEs. In our work, we performed an initial study examining the effect of the DCSBD (the diffuse coplanar surface barrier discharge) plasma on perovskite thin films. The sample was placed in the vicinity of the plasma and exposed to the plasma for different duration. Using in-situ photoluminescence (PL) spectroscopy, we found that the exposure of perovskite surface to plasma in nitrogen atmosphere affects the PL efficiency. After initial decrease of the PL intensity caused by surface defects created by exposure to plasma, the PL recovers, reaching 50-200 % of its original value. This means that the PT has a positive impact on defect densities in perovskite film. The plasma treatment results in improvement of Voc of 15 – 60 mV depending on the duration of the PT. We believe this method has potential as an intermediate step before the deposition of a passivation layer on the perovskite. Additionally, the DCSBD plasma treatment is already used in different industrial applications and thus it is ready for use in large production lines.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů