Achieving Air/Water Stable and Photocatalytically Active Ge-Containing 2D Halide Perovskites by Organic Spacer Engineering

Preparation of Heterojunctions Based on Cs₃Bi₂Br₉ Nanocrystals and G-C₃N₄ Nanosheets for Photocatalytic Hydrogen Evolution

“…Based on the previous considerations, the strategy used in the present work to overcome the limitations of bulk g-C3N4 is based on increasing its surface area by a thermal exfoliation process followed by the construction of a heterojunction with Cs3Bi2Br9 NCs via wet ball milling. As already demonstrated for a similar bulk heterojunction [5], there is a favourable band-alignment between the two semiconductors that promotes charge transfer and reduces the charge recombination rate of g-C3N4. In addition to this, the nanostructured morphology of the present heterojunction is expected to provide a more efficient route for the photocatalytic activity of the Cs3Bi2Br9 NCs/g-C3N4 NSs composites.…”

“…In general, lead is replaced by elements with similar electronic structure and/or comparable ionic radius, such as Sn 2+ , Ge 2+ , Sb 3+ or Bi 3+ . To date, several examples of the use of lead-free MHPs in photocatalysis have been reported [5][6][7]. Among these results, a class of interesting phases, showing good performances, is the one of Cs3Bi2X9 perovskites derivatives.…”

Preparation of Heterojunctions Based on Cs3Bi2Br9 Nanocrystals and g-C3N4 Nanosheets for Photocatalytic Hydrogen Evolution

“…In general, lead is replaced by elements with similar electronic structure and/or comparable ionic radius, such as Sn 2+ , Ge 2+ , Sb 3+ or Bi 3+ . To date, several examples of the use of lead-free MHPs in photocatalysis have been reported [ 7 , 8 ]. Among these results, a class of interesting phases, showing good photocatalytic performances, is that of Cs 3 Bi 2 X 9 perovskites derivatives which display high stability in water, light and heat, combined with their low toxicity and the relatively low cost of bismuth [ 9 ].…”

Theoretical investigation of octahedral tilting and bandgap non‐linearity in monolayer Ruddlesden‐Popper A 2 Pb 1‐x Ge x I 4 perovskites

“…Mixed 2D‐perovskites with tuneable bandgaps and hydrophobicity offer new dimensionalities in photovoltaics. Photo‐catalytically active and air/water‐stable Ge‐containing 2D‐HOIPs, PhBz 2 GeBr 4, and PhBz 2 GeI 4 are synthesized by organic spacer engineering 70 . Nevertheless, with compositional engineering, tuneable 2D‐perovskite as a high bandgap absorber layer can be paired up with 3D‐perovskites as a low bandgap bottom cell, to architect efficient tandem devices 61 .…”

“…Photo-catalytically active and air/water-stable Ge-containing 2D-HOIPs, PhBz 2 GeBr 4, and PhBz 2 GeI 4 are synthesized by organic spacer engineering. 70 Nevertheless, with compositional engineering, tuneable 2D-perovskite as a high bandgap absorber layer can be paired up with 3D-perovskites as a low bandgap bottom cell, to architect efficient tandem devices. 61 In 2D-3D tandem solar cells, 2D layers can offer good stability to moisture degradation just as Ultraviolet (UV) filtration passivator layers improve PCE by protecting the absorber layer from UV exposure.…”