Low Bandgap, Stable, Non Toxic Perovskite for Inexpensive and Efficient Photovoltaics


Perovskites are composite materials typically having a cubic licensing Opportunity 2018076or tetragonal crystal structure with the stoichiometry of AMX3, where A and M are metal cations and X is an anion. Hybrid organic-inorganic lead halide perovskites have prompted global research due to their potential use in solar cell technologies. Despite their promising electronic properties and low production costs for photovoltaic and optoelectronic applications, commercialization of lead halide perovskites has been hindered by their instability as well as by long term health and environmental concerns mostly related to leaching of lead due to their water solubility. An attractive alternative are all inorganic double perovskties. However, the absorption profile of most double perovskites reported to date have bandgaps greater than 2eV making them much less efficient than the silicon (Si) alternative.

To address these shortcomings, the University of Alberta inventors have synthesized a lead free, inexpensive and highly abundant element, heterovalent Cu2+ doping analogue of Cs2SbAgCl6 with a bandgap of 1eV. The material’s feasibility for photovoltaic applications was further examined through thermal and moisture exposure, demonstrating long term structural and photo-physical stability.


  • Lead free, thereby environmentally friendly.
  • Highly stable. The structural and photo-physical stability of the material has been demonstrated for 1 year.
  • Less expensive to make than crystalline Si, resulting in lower cost end products.
  • Highly efficient in converting solar energy to electricity due to the material’s small bandgap of 1eV.
  • Can be applied with versatility on to any kind of surface including flexible surfaces.


Protection Status

Patent Pending

Product Number


Contact Information

Mandira Das
Technology Management Group
TEC Edmonton – University of Alberta
Phone: 780-492-9123
​Email: mandira.das@tecedmonton.com