Publication date: 17th July 2025
Surface ligand engineering offers a powerful approach to optimize the optical performance and environmental durability of perovskite nanocrystals (NCs). In this study, I successfully synthesized CsPbBr3 NCs thin films by hot injection in ambient-air environment (humidity >50%RH). By employing a stepwise post-synthetic washing method, I precisely regulate the particle size from 18.8 nm to 34.7 nm, achieving a maximum photoluminescence quantum yield (PLQY) enhancement from 21.46% to 38.95%. This moderate crystal growth reduces surface defect density while maintaining colloidal stability, leading to extended carrier lifetimes (32.53ns) and improved radiative recombination. The thin films prepared with two ligand-washing process exhibit superior thermal resilience, retaining 64.7% of its original PLQY after 120 min at 120 °C). Furthermore, the CsPbBr3 photodetector devices exhibit stronger low-light photoresponsivity (0.73 A/W at 5.6 mW) and more stable high-light photodetectivity (8.1×108 Jones at 28.1 mW) due to its fewer surface ligands and defects. These results confirm that partial ligand removal enables an optimal particle size regime that simultaneously enhances optical efficiency and environmental robustness, offering a scalable strategy for advancing the performance of perovskite-based photodetector devices.
I wish to acknowledge the support of the Henry Royce Institute for Advanced Materials through the Industrial Collaboration Programme (RICP-R4-100061) and MATcelerateZero (MATZ0), funded from a grant provided by the Engineering and Physical Sciences Research Council EP/X527257/1. M. Abdi-Jalebi acknowledges the Department for Energy Security and Net Zero (Project ID: NEXTCCUS), University College London's Research, Innovation and Global Engagement, Cornell-UCL Global Strategic Collaboration Awards, and University of Sydney-University College London Partnership Collaboration Awards for their financial support. M. Abdi-Jalebi acknowledges the ACT program (Accelerating CCS Technologies, Horizon2020 Project No. 691712) for the financial support of the NEXTCCUS project (project ID: 327327). M. Abdi-Jalebi acknowledges Cambridge Materials Limited for its funding and technical support. M. This work was supported by the Henry Royce Institute for advanced materials through the Equipment Access Scheme enabling access to the Royce SEM-FIB Suite at Cambridge; Cambridge Royce facilities grant EP/P024947/1 and Sir Henry Royce Institute - recurrent grant EP/R00661X/1.
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