Publication date: 21st July 2025
Lead halide perovskite quantum dots (QDs) have emerged as highly promising candidates for next-generation photodetectors (PDs). However, a significant limitation lies in the weak binding of conventional long-chain ligands on the QD surface, which compromises both charge transfer efficiency and material stability. In this study, we introduce a novel approach involving the partial substitution of these long-chain ligands with shorter, aromatic alternatives, specifically phenylethylamine (PEA) and trans-cinnamic acid (TCA). We investigated the impact of this ligand engineering on the performance of CsPbBr3 QDs-based photodetectors fabricated on flexible textile substrates. Our results show that devices with optimal concentrations of PEA (L-type) and TCA (X-type) and TCA doping exhibit markedly improved performance compared to the control device, which we attribute to enhanced conductivity, a longer photoluminescence lifetime, reduced surface defects, and minimized non-radiative recombination. The PEA-treated device displayed superior blue-light photodetection, achieving a peak responsivity of and an external quantum efficiency (EQE) of 41.3%. Furthermore, the devices demonstrated excellent mechanical flexibility, maintaining high performance even after 500 bending cycles.
A. M. acknowledges funding from European Union's Horizon 2023 research and innovation programme under the Marie Sklodowska-Curie grant agreement no 101154567 (SolProDet).
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