Tuning the Optical Properties of Cesium Lead Halide Perovskite Nanocrystals by Anion Exchange Reactions
Quinten A. Akkerman,Valerio D’Innocenzo,Sara Accornero,Alice Scarpellini,Annamaria Petrozza,Mirko Prato,Liberato Manna +6 more
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TLDR
It is demonstrated that, via controlled anion exchange reactions using a range of different halide precursors, this approach gives access to perovskite semiconductor NCs with both structural and optical qualities comparable to those of directly synthesized NCs.Abstract:
We demonstrate that, via controlled anion exchange reactions using a range of different halide precursors, we can finely tune the chemical composition and the optical properties of presynthesized colloidal cesium lead halide perovskite nanocrystals (NCs), from green emitting CsPbBr3 to bright emitters in any other region of the visible spectrum, and back, by displacement of Cl– or I– ions and reinsertion of Br– ions. This approach gives access to perovskite semiconductor NCs with both structural and optical qualities comparable to those of directly synthesized NCs. We also show that anion exchange is a dynamic process that takes place in solution between NCs. Therefore, by mixing solutions containing perovskite NCs emitting in different spectral ranges (due to different halide compositions) their mutual fast exchange dynamics leads to homogenization in their composition, resulting in NCs emitting in a narrow spectral region that is intermediate between those of the parent nanoparticles.read more
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Blue-emitting and self-assembled thinner perovskite CsPbBr3 nanoplates: synthesis and formation mechanism
Xiao Xiaolin,Ye Li,Rong-Jun Xie +2 more
TL;DR: This work developed a strategy to synthesize uniform and very thin CsPbBr3 perovskite nanoplates (NPls) by introducing additional metal bromides by adding FeBr3.
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Boosting the Stability of Fully-Inorganic Perovskite Solar Cells through Samarium Doped CsPbI2Br Perovskite
TL;DR: Fully inorganic cesium-lead halide (CsPbI2Br) perovskite is growing favorable to be a promising alternative light-absorbing material to the organic-inorganic hybrid perovskiite because of the boosted...
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Perovskite Nanoparticle Composite Films by Size Exclusion Lithography
Duong Nguyen Minh,Sangwon Eom,Lan Anh Thi Nguyen,Juwon Kim,Jae Hyun Sim,Chunhee Seo,Jihye Nam,Sangheon Lee,Soyeon Suk,Jaeyong Kim,Youngjong Kang +10 more
TL;DR: Perovskite nanoparticle composite films with capability of high-resolution patterning and excellent resistance to various aqueous and organic solvents are prepared by in situ photosynthesis of acrylate polymers and formamidinium lead halide nanoparticles.
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Investigation of anti-solvent induced optical properties change of cesium lead bromide iodide mixed perovskite (CsPbBr3-xIx) quantum dots.
TL;DR: XPS analysis shows that the Br:I ratio of the CsPbBr3-xIx QDs had changed as a result of exposure to the anti-solvent, causing the change of the band gap and shift of the spectra, and it is shown that iodine can be removed more easily than bromine during theAnti-Solvent purification.
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Prospects of Z-Scheme Photocatalytic Systems Based on Metal Halide Perovskites.
TL;DR: In this paper, the advantages and limitations of metal halide perovskites (MHPs) compared to traditional semiconductor materials for applications as photocatalysts and describe emerging examples in the construction of MHP-based Z-scheme systems.
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