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2021 Adv. Energy Mater., Sb2(S,Se)3 Solar Cell PCE 10.7%! How to Achieve through Solution Post-Treatment?

SS-X solar simulator makes the breakthrough possible!

  Advanced Energy Materials (IF 29.368) published a study in November 2021. Antimony chalcogenides (Sb2(SxSe1x)3,0 < x < 1) have been considered as an alternative photovoltaic material for thin-film solar cells over the past 6–7 years because of their excellent photoelectric properties. However, the understanding of the power conversion efficiency (PCE) and functionalities of Sb2(S,Se)3 films as well as based solar cells are still far lower than that of the other well-established chalcogenide-based solar cells, such as Cu(In,Ga)Se2(CIGS) and CdTe. Therefore, improving the PCE of Sb2(S,Se)3 thin-film solar cells and delving deeper into its functionalities have always been important topics.

  Here, the research team developed a facile alkali metal fluorides-assisted solution post-treatment (SPT) procedure to treat Sb2(S,Se)3 thin films. SPT can not only enhance the morphology and crystallinity of the film, but also can control the S/Se gradient in the films and generate favorable energy alignment which facilitates the carrier transport, resulting in significant improvements in JSC and FF. In the process, Enlitech’s Solar Simulator was used in this study to assist in the measurement of experimental data.

antimony chalcogenide solar cells boxplot J-V curves EQE spectra

a) Statistical boxplots of efficiency for Sb2(S,Se)3 solar cells. b) J-V curves and c) EQE spectra of Sb2(S,Se)3 solar cells treated with or without NaF-SPT process.

3D-SIMS images of Na enlarged XRD spectra of 2-Theta

a) 3D-SIMS images of Na. b) Surface SEM images. c) Enlarged XRD spectra of 2-Theta from 28.6° to 29.8°.

  It was found that the Sb2(S,Se)3 planar solar cells manufactured using the NaF-SPT technique achieved the highest PCE of 10.7% among various antimony chalcogenide materials including Sb2S3, Sb2Se3, and Sb2(S,Se)3. This study establishes a novel and efficient post-processing method for Sb2(S,Se)3 solar cells and would benefit the fabrication of other kinds of metal chalcogenide solar cells.

  Enlitech’s solar simulator complies with international standards. With KA-6000 software, it provides a short-term monitoring of time changes to prove the stability of the perovskite solar cell!

NaF-SPT-based devices J-V curves normalized PCE

The J-V curves of a) control and b) NaF-SPT-based devices and c) the normalized PCEs measured at the beginning and after 30 days of storage in a dry cabinet.

Keywords: antimony chalcogenide, solution post-treatment, solar cell, Solar Simulator, Sun Simulator

Article link: https://doi.org/10.1002/aenm.202103015

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antimony chalcogenide solution post-treatment solar cell

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