Revealing the Role of Vapor Flux in Chemical Vapor Deposition Growth of Bi<sub>2</sub>O<sub>2</sub>Se for Photodetectors

Revealing the Role of Vapor Flux in Chemical Vapor Deposition Growth of Bi<sub>2</sub>O<sub>2</sub>Se for Photodetectors

Two-dimensional (2D) materials are regarded as key foundational materials for next-generation optoelectronic devices. As a promising new type of 2D layered semiconductor, Bi<sub>2</sub>O<sub>2</sub>Se has emerged as a strong candidate for high-performance opto-electronic devi...

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Main Authors: Qin Huang, Jiqing Nie, Jian Li, Meng Wang, Changyuan Ding, Haiyan Nan, Xiaofeng Gu, Zhengyang Cai
Format: Article
Language:English
Published: MDPI AG 2025-04-01
Series:Nanomaterials
Subjects:
two-dimensional materials
chemical vapor deposition
Bi<sub>2</sub>O<sub>2</sub>Se
vapor reaction
photodetectors
density functional theory
Online Access:https://www.mdpi.com/2079-4991/15/8/567
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Summary:Two-dimensional (2D) materials are regarded as key foundational materials for next-generation optoelectronic devices. As a promising new type of 2D layered semiconductor, Bi<sub>2</sub>O<sub>2</sub>Se has emerged as a strong candidate for high-performance opto-electronic devices due to its high carrier mobility, tunable bandgap, and excellent environmental stability. However, achieving precise control over Bi<sub>2</sub>O<sub>2</sub>Se growth to obtain high-quality Bi<sub>2</sub>O<sub>2</sub>Se remains a challenge in the field. In this study, we employed chemical vapor deposition (CVD) to grow thin-layer 2D Bi<sub>2</sub>O<sub>2</sub>Se flakes. We further used a transport model and thermodynamic Arrhenius fitting to analyze the relationship between vapor flux and the properties of the flakes. Density functional theory was used to study the electronic structure of the as-grown samples. The electrical and optoelectronic results demonstrate that Bi<sub>2</sub>O<sub>2</sub>Se-based FETs exhibit good performance in terms of mobility (129 cm<sup>2</sup>V<sup>−1</sup>s<sup>−1</sup>), on/off ratio (4.51 × 10<sup>5</sup>), and photoresponsivity (94.98 AW<sup>−1</sup>). This work provides a new way to study the influence of vapor flux on the sizes and shapes of Bi<sub>2</sub>O<sub>2</sub>Se flakes for photodetectors.
ISSN:2079-4991

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