A Dense, Pinholes-free Pure Cubic Phase CsPbBr3 Nanocrystals Film for High-performance Photodetector

• Published in: Electronic materials letters 2024, 20(2), , pp.217-223
• Main Authors: Duong, Thanh-Tung, Tran, Phuong-Nam, Van, Tuan-Pham, Nguyen, Duy-Hung, Tran, Van-Dang
• Format: Article
• Language: English
• Subjects: Carrier mobility; Characterization and Evaluation of Materials; Charge transfer; Chemistry and Materials Science; Condensed Matter Physics; Current carriers; Dark current; Materials Science; Nanocrystals; Nanotechnology; Nanotechnology and Microengineering; Optical and Electronic Materials; Optoelectronic devices; Original Article – Nanomaterials; Perovskites; Photometers; Pinholes; Quantum efficiency; Room temperature; Thin films; 전자/정보통신공학
• ISSN: 1738-8090; 2093-6788
• DOI: 10.1007/s13391-023-00448-x

This study demonstrates a simple centrifugal coating method to prepare high-quality pure cubic phase CsPbBr 3 nanocrystal film. The resultant perovskite layers possess a uniform and dense 500 nm-thick, with a bandgap of 2.38 eV, a low trap-state density of 6.9 × 10 − 15  cm − 3 , and carrier mobility of approximately 19.8 cm 2 V − 1 s − 1 . Furthermore, CsPbBr 3 NCs-based self-powered photodetectors with high charge carriers’ charge transfer are fabricated. The device shows a low dark current density of 1.93 × 10 − 7  A/cm 2 at room temperature. Such photodetectors show the highest responsivity of 3.0 AW − 1 , specific detectivity of 1.2 × 10 13 Jones, and external quantum efficiency (EQE) of 920% at zero bias voltage. The proposed method shows significant promise for use in the lab fabrication of optoelectronic devices based on thin films of nanocrystal perovskite materials. Graphical Abstract