AI Article Synopsis

  • The scaffold layer in mesoporous perovskite solar cells (PSCs) is crucial for electron transport and minimizing recombination, leading to increased interest in the interface engineering between this layer and the light absorber.
  • Vertically grown TiO nanorods (NRs) were treated with a TiCl aqueous solution to create a thin brookite TiO nanoparticle layer, enhancing perovskite infiltration and growth.
  • A PSC built on the TiO NR/brookite NP structure showed a remarkable power conversion efficiency of 15.2%, significantly outperforming the bare NR version, showcasing improved transport capabilities and reduced carrier recombination.

Article Abstract

The scaffold layer plays an important role in transporting electrons and preventing carrier recombination in mesoporous perovskite solar cells (PSCs), so the engineering of the interface between the scaffold layer and the light absorption layer has attracted widespread concern. In this work, vertically grown TiO nanorods (NRs) as scaffold layers are fabricated and further treated with TiCl aqueous solution. It can be found that a thin brookite TiO nanoparticle (NP) layer is formed by the chemical bath deposition (CBD) method on the surface of every rutile NR with a low annealing temperature (150 °C), which is beneficial for the infiltration and growth of perovskite. The PSC based on the TiO NR/brookite NP structure shows the best power conversion of 15.2%, which is 56.37% higher than that of the PSC based on bare NRs (9.72%). This complex structure presents an improved pore filling fraction and better carrier transport capability with less trap-assisted carrier recombination. In addition, low-annealing-temperature-formed brookite NPs possess a more suitable edge potential for electrons to transport from the perovskite layer to the electron collection layer when compared with high-annealing-temperature-formed anatase NPs. The brookite phase TiO fabricated at a low temperature presents great potential for flexible PSCs.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9608627PMC
http://dx.doi.org/10.3390/nano12203653DOI Listing

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