Indole-2-Carboxylic Acid Ligand-Mediated Synthesis of Stable Perovskite Nanocrystals for Fast Responsive Photodetector

Ravi -; Praveen Kumar; Ankit Kumar; Dipayan Ray; Monojit Bag; Prasenjit Kar

doi:10.1002/chem.202501823

Indole-2-Carboxylic Acid Ligand-Mediated Synthesis of Stable Perovskite Nanocrystals for Fast Responsive Photodetector

Chemistry. 2025 Jun 27:e202501823. doi: 10.1002/chem.202501823. Online ahead of print.

Authors

Ravi -¹, Praveen Kumar², Ankit Kumar¹, Dipayan Ray¹, Monojit Bag², Prasenjit Kar³

Affiliations

¹ IIT Roorkee: Indian Institute of Technology Roorkee, Chemistry, INDIA.
² IIT Roorkee: Indian Institute of Technology Roorkee, Physics, INDIA.
³ IIT Roorkee, Chemistry, IIT Roorkee, 247667, Roorkee, INDIA.

PMID: 40576579
DOI: 10.1002/chem.202501823

Abstract

Cesium lead bromide perovskite nanocrystals (NCs) show great potential for photoelectric properties. However, due to their poor stability and the insulating nature of passivating ligands, they suffer from practical applications. Herein, in an approach to passivate NCs surface by introducing a ligand, Indole-2-carboxylic acid (ICA), we synthesized a mixed CsPbBr3/Cs4PbBr6 NCs by ligand-assisted re-precipitation approach. Incorporating ICA ligand in place of long chain insulating Oleic acid (OA) effectively reduced the loss of non-radiative recombination induced by surface trap states. Through all the performed compositional and structural characterization, the existence of CsPbBr3/Cs4PbBr6 mixed NCs was confirmed. The obtained CsPbBr3/Cs4PbBr6 mixed NCs show green emission at 518 nm and superior stability under ambient conditions compared to CsPbBr3 NCs. The photoluminescence (PL) of the CsPbBr3/Cs4PbBr6 mixed NCs increased approximately three times, and the photoluminescence quantum yield (PLQY) increased from 75 ± 2% to 94 ± 2% as compared to CsPbBr3 NCs.

Keywords: ligand passivation; perovskite NCs; photodetector; photoluminescence; stability enhancement.