Publication date: 15th December 2025
Cesium lead halide has been extensively studied as efficient materials for optoelectronic
device applications. Beyond Cs(I), the exploration of other inorganic A-site monovalent cations
remains limited, though Rb(I) stands out as a potential alternative whose role in colloidal
nanocrystals is largely unexplored. Here, Rb (I) is employed as an effective A-site cation in
forming monoclinic-phase RbPb₂Cl₅, where Pb (II) heptahedrally coordinated. A template
mediated cation exchange strategy is employed where 0D Rb₄CdCl₆ used as host nanocrystals.
Upon introduction of Pb (II), fast Cd to Pb ion exchange triggers and 2D RbPb₂Cl₅ in rhombic
prism, hexagonal prism or hexagonal platelet shaped nanocrystals are formed depending on
the reaction conditions. Further to explore the optoelectronic properties, photo response
measurements are carried out which exhibit significant pyro-photocurrent response from
these nanocrystals even under ultra-low-intensity light illumination (7 nW/cm2) across
ultraviolet (UV) to near-infrared (NIR) spectral range. Despite its centrosymmetric structure,
RbPb₂Cl₅ generates pyro-photocurrent due to surface halide deficiencies, supported by DFT
showing surface polarization of |𝝙P| = 0.173 C/m2. These findings highlight the pivotal role of
Rb (I) in stabilizing these nanostructures and open a new avenue for their application in
advanced optoelectronic devices.
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