Cheng Yi-Chia, Lin Chih-Yu, Tseng Chia-Hsuan, Tsai Meng-Lin, Chiu Sheng-Kuei, Shen Ji-Lin, Chen Shih-Lun, Chuang Chiashain, Tsai Dung-Sheng
Undergraduate Program in the College of Electrical Engineering of Computer, Chung Yuan Christian University, Taoyuan City 32023, Taiwan.
Department of Electrical Engineering, Chung Yuan Christian University, Taoyuan City 32023, Taiwan.
Nanotechnology. 2025 May 28;36(23). doi: 10.1088/1361-6528/add899.
We have successfully demonstrated CsPbBrperovskite quantum dots (QDs)/transfer-free eco-friendly (TFEF) graphene heterostructures with broadband and fast photoresponse. At first, the TFEF graphene is grown directly on the SiO/Si substrates in an atmospheric pressure chemical vapor deposition (APCVD) system with the copper-foil wrapping methods and camphor precursors. Raman mapping image (15 × 15m) showed TFEF graphene with high coverage across the surface (∼65% single-layer graphene, ∼15% bilayer graphene, and ∼20% multilayer graphene). After that, CsPbBrQDs were synthesized and then spin-coated on the TFEF graphene surface to form heterostructures. Compared to pure CsPbBrQD-based photodetectors (PDs), CsPbBrQDs/TFEF graphene-based PDs show a higher photo-to-dark current ratio of ∼7.2 at 2 V white light illumination (112 mW cm). Furthermore, the CsPbBrQDs/TFEF graphene-based PDs show a broadband photoresponse range from ultraviolet to near-infrared with a peak responsivity reaching up to 32 mA W, a high detectivity (2.2 × 10cm·Hz/W) and fast operation speed (rise/fall time: ∼7/∼ 14 ms). This study opens avenues to develop low-cost and rapid fabrication processes of perovskite/2D nanomaterial-based PDs for fast optical communication, image capture, and flame detection applications.
