Carbon-based, HTL-free perovskite solar cells with 26% performance

Apr 6, 2022 01:51 PM ET
  • A global study group has developed a carbon-based perovskite solar cell without a hole transportation layer. 2 plasmonic nanoparticles-- Ag@SiO2 and also SiO2@Ag@SiO2-- were included in the cell photoactive layer, in addition to a copper( I) thiocyanate (CuSCN) interlayer at the perovskite-carbon interface.
Carbon-based, HTL-free perovskite solar cells with 26% performance
Image: University of Isfahan, Creative Commons License CC BY 4.0

A worldwide research group has proposed a new style for perovskite solar cells without a hole transport layer (HTL), based upon carbon-based materials to change the metal contact and also the HTL.

The scientists said that carbon-based perovskite solar cells have reached efficiencies of about 15%, which is considerably less than those attained by cells equipped with HTL/metal back calls. Nanoparticles of titanium oxide (TiO2) in the electron transfer layer (ETL) rise recombination due to the trapping of electron service providers as well as the low mobility of service providers in the perovskite-filled mesoporous framework, thus bring about the most affordable performance.

" This, in turn, impacts hysteresis actions in determining the performance and instability of the device as a result of the ion migration," the scientists explained. "Supplying a carbon-based planar framework by removing mesoporous TiO2 can not only minimize the device's hysteresis habits, however additionally take one more step towards commercializing perovskite-based solar cells by decreasing the expense of mass production."

In the recommended cell layout, two plasmonic nanoparticles referred to as Ag@SiO2 and also SiO2@Ag@SiO2 were added to the cell photoactive layer and also a copper(I) thiocyanate (CuSCN) interlayer was placed at the perovskite-carbon interface. The latter purportedly has outstanding semiconducting residential properties, consisting of high hole mobility, large bandgap, optical openness, as well as thermal and chemical stability.

The HTL-free maximized plasmonic cell accomplished a power conversion efficiency of 19.72%, an open-circuit voltage of 0.918 V, a short-circuit current of 28.05 mA/cm2, and also a fill aspect of 76.57%.

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