New Synthesis of Lead Free Perovskite Nano Particles with the Formula CsSnBr3 to Increase Stability and Optical Properties.
Tal Binyamin a, Lioz Etgar a
a The Hebrew University of Jerusalem, Givat Ram, Jerusalem, Israel
nanoGe Perovskite Conferences
Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
International Conference on Perovskite Photonics and Optoelectronics
Jerusalem, Israel, 2019 February 24th - 27th
Organizers: Lioz Etgar and Paul Meredith
Poster, Tal Binyamin, 060
Publication date: 21st November 2018

Nano-particles of perovskite are well investigated due to their interesting optoelectronic properties, from quantum size effect, through tunable band-gap and to high PLQY, which make it suitable for Light Emitting Diodes (LEDs). The most common and explored composition of all in-organic perovskite NPs is CsPbX3 (X=Cl­-, Br-,I-). Substituting the Pb2+ with other bivalent cation, reduces the toxicity of the NPs, and by doing so makes it more suitable for industrial production. Here we present a new synthesis of lead free NPs with the formula CsSnBr3. Due to the low reduction potential of Sn2+ to Sn4+ the stability of those particles is poor, which makes it difficult to observe and measure the optical properties. In order to increase the stability and improve the optical properties we used benzoyl bromide as the bromide source and it allows to control the amount of reactant in the synthesis. we also added TBP as a ligand and hydrohalic acids as an additive.

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