Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Organic shells (i.e ligands) play a crucial role in the properties and functionality of nanostructures mainly due to their interaction with the surrounding solvent. Using functional molecules as NPs ligands open a path to influence the properties and functionality of NPs. In this work we demonstrate controlled assembly of CsPbBr3 perovskite nanoparticles in reaction to light, induced by azo- benzene molecules.
The azo-ligand 4-[4-(2-Phenyldiazenyl)phenoxy]butanoic acid (PDPB) (i.e. azo-ligands), undergo isomerization reaction from trans (E)-PDPB to cis (Z)-PDPB. Once switching from trans to cis, the polarity of the molecule changes, which is translated to a decreased solubility in non-polar solvents. While attached to the NPs, the ligands affect the solubility of the NPs in non-polar solvents, and enable to observe assembly. Due to the reversibility of the transition the assembly and dis-assembly of the NPs is controlled by light.
We tracked the attachment of the ligands to the surface of the NPs, using Polarization modulated infrared reflection absorption spectroscopy and nuclear magnetic resonance (NMR). Using absorbance, photoluminescence and high resolution transmission electron microscopy (HRTEM), we followed the assembly and the dis-assembly of these perovskite NPs. Furthermore, it was possible to show switchable energy transfer process between different NPs in two systems; PeNPs–Perovskite nanowires and PeNPs–PbS NPs. During the assembly process the proximity between the NPs increases and enables energy transfer, which is switched off when return to the trans isomer. Following the cis–trans isomerization, the PL lifetime was changed, which supports the switchable energy transfer process. This work presents new direction in the controlled functionality of nanomaterials.
We would like to thank the Israel Science foundation and the Air Force Research Laboratory (AFRL) for their financial support.
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