Exploring the Role of Short Chain Acids as Surface Ligands in Photoinduced Charge Transfer Dynamics from CsPbBr3 Perovskite Nanocrystals

The most commonly used surface capping ligands, like oleic acid and oleylamine, passivate the surface of perovskite nanocrystals (PNCs) to enhance their stability and optical properties. However, due to their inherent insulating nature, charge transport across the surface of the PNCs is hindered, li...

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Published inThe journal of physical chemistry letters Vol. 14; no. 7; pp. 1910 - 1917
Main Authors Biswas, Subarna, Akhil, Syed, Kumar, Nitish, Palabathuni, Manoj, Singh, Rahul, Dutt, V. G. Vasavi, Mishra, Nimai
Format Journal Article
LanguageEnglish
Published American Chemical Society 23.02.2023
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Summary:The most commonly used surface capping ligands, like oleic acid and oleylamine, passivate the surface of perovskite nanocrystals (PNCs) to enhance their stability and optical properties. However, due to their inherent insulating nature, charge transport across the surface of the PNCs is hindered, limiting their application in devices. In this study, we have post-treatment CsPbBr3 PNCs with short chain ligands benzoic acid (BA) and ascorbic acid (AA) and observed that both acid-treated PNCs show enhanced stability and optical properties. Still, BA-treated PNCs show the highest charge transport rate due to their conjugating nature. The photoelectrochemical measurements also show the most efficient electron flow across the surface of the PNC with BA-treated PNCs. A longer carrier lifetime and fast charge transfer make BA-treated PNCs ideal candidates for application in real-life devices.
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ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.2c03772