Core-shell perovskite nanocrystals for photovoltaic applications
Published : 15 July 2019
Halogenated perovskite materials have recently created a sensation in the field of photovoltaics and other optoelectronic applications because of the very high efficiencies obtained. Colloidal nanocrystals (NCs) of the perovskites have very recently attracted a lot of attention because of their unique optical properties, very high quantum yields and simple synthesis. The use of the perovskite NCs for the solar energy applications is limited today by their toxicity (they contain lead) and lack of stability. In the framework of the PhD project we propose for the first time to tackle both of these problems by synthesizing core-shell NCs with the inorganic perovskite core (based on Pb or Bi) and a lower crystalline dimensionnality perovskite shell (Cs3Bi2X9 or other 0D, 1D, 2D analogues). The shell will protect photoactive core and will limit (or eliminate completely) the toxicity. These systems will be studied by the advanced techniques available at the CEA or though ongoing international collaborations. The thin film or sensitized solar cells based on the best core-shell perovskite NC heterostructures will be fabricated and tested.