Rubidium Lead Chloride Perovskite Materials for Photovoltaics

Etgar Lioz, HUJI, Faculty of Science, The Institute of Chemistry


Rubidium, Cesium, Nanocrystals, , UV, NIR

Current development stage

TRL3 Experimental proof of concept       


  • Perovskite materials, both in bulk and nanometric forms, have excellent properties as light harvesting materials in the visible spectrum showing great applicative potential in the optoelectronic and solar fields.
  • The common organic methylammonium (MA) cation is susceptible to thermal breakdown impairing performance of solar cells. 
  • One of the possible candidates to replace the MA, in order to improve perovskite's thermal stability is the inorganic rubidium (Rb) and Cesium (Cs) cations. The synthesis of nanometric mixed cation RbxCs1-xPbX3 perovskite NPs has never been reported.
  • The absorption of the nanoparticles is fine-tuned in the near ultra-violet and visible regions between ~ 395-525 nm for RbxCs1-xPbX3 (x=0 to x=0.8 and X=Cl or Br).

Our Innovation

Researchers have synthesized a novel rubidium lead chloride nanocrystals (with the formula Rb6Pb5Cl16) and RbxCs1-xPbX3 (x=0 to x=0.8 and X=Cl or Br) which has intriguing features, a complicated structure, tuned optical properties and high stability.


  • Active in the UV to NIR region
  • Fine tuning of optical properties
  • Long term stability


  • Developing more advanced mixed-ion perovskite compositions in the nano-scale.
  • The absorption of the nanoparticles is tunable in the near ultra-violet and visible regions between ~ 395-525 nm for RbxCs1-xPbX3 (x=0 to x=0.8 and X=Cl or Br).
  • The attempt to synthesize Cl- and Br-based nanoparticles with high Rb+ content succeeded, although possessing low tolerance factors. We conclude that these mixed Rb+/Cs+ nanoparticles are more adjustable to structural distortions caused by the cation substitutions than their bulk counterparts
  • We successfully demonstrate the possibility to introduce Rb+ cation with Cs+ cation in RbxCs1-xPbX3 NPs using hot injection method.
  • The NPs with the variable Rb+:Cs+ ratios showed an absorption shift of 0.13 eV and 0.07 eV, respectively.
  • A synthesis of x=1 (Rb+ alone as the A-cation) was also implemented with Cl. Cl-based NPs resulted in another phase of Rb6Pb5Cl16, which presented a remarkable blue shift towards onset of ~ 305 nm.
  • The NCs exhibit relatively high PLQYs, which are similar to the ones reported for CsPbX3 (X=Cl, Br) NCs.


Fig. 1:  (a,b) Absorbance and normalized photoluminescence (PL) spectra of RbxCs1-xPbCl3 NPs (x=0, 0.2, 0.4, 0.6, 0.8). (c,d) Absorbance and normalized PL spectra of RbxCs1-xPbBr3 NPs (x=0, 0.2, 0.4, 0.6, 0.8).



  • Utilized for ultra violet, visible, and Near infra-red light emitting diodes (UV-LED, Vis-LED and NIR-LED) or lasing applications.
  • Function as an anode for lithium-ion batteries, which can be very attractive also in the nanometric scale.
  • Function as a precursor in the synthesis of PbSe nanocrystals.
  • Used to achieve the perovskite phase of in the RbxCs1-xPbX3 nanoscale.


Patent Status

Published WO 201S/203335 A2

Contact for more information:

Matt Zarek
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