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Posted: Jan 19, 2018
Tuning perovskite solar cells with nanoparticle additives
(Nanowerk News) Researchers have employed carbon nanoparticles with an average diameter of 20 nm in high efficiency state-of-the-art perovskite solar cells to control the morphology of the perovskite film.
Recently, perovskite solar cells have attracted considerable interest among the photovoltaics research community, because of their high solar-to-electric power conversion efficiencies and low fabrication costs.
"we find that the functional groups of the CNPs interact with perovskite components already in the precursor solution resulting in a larger grain size, better thermal stability, and hydrophobicity of the perovskite film," write the scientists. "Whereas efficiencies above 18% could be maintained after adding the CNPs, the hysteresis in the current–voltage curves was considerably decreased compared to reference devices."
The films show larger grain sizes and increased thermal stability when CNPs were added to the perovskite by dispersing them in the precursor solution.
Whereas a power conversion efficiency larger than 18% could be maintained, the hysteresis was decreased to negligible values despite using a TiO2 contact.