Epitaxial Growth of 2D Bi₂O₂Se Nanoplates/1D CsPbBr₃ Nanowires Mixed‐Dimensional Heterostructures with Enhanced Optoelectronic Properties

Abstract

The 2D/1D mixed‐dimensional van der Waals heterostructures have great potential for electronics and optoelectronics with high performance and multifunctionality. The epitaxy of 1D micro/nanowires on 2D layered materials may efficiently realize the large‐scale preparation of 2D/1D heterostructures, which is critically important for their practical applications. So far, however, only the wires of Bi2S3, Te, and Sb2Se3 have been epitaxially grown on MoS2 or WS2. Here, it is reported that the epitaxial growth of 1D CsPbBr3 nanowires on 2D Bi2O2Se nanoplates through a facile vertical vapor deposition method. The CsPbBr3 wires are well aligned on the Bi2O2Se plates in fourfold symmetry with the epitaxial relationships of [001]CsPbBr3||[200]Bi2O2Se and [1‐10]CsPbBr3||[020]Bi2O2Se. The photoluminescence results reveal that the emission from CsPbBr3 is significantly quenched in the heterostructure, which implies the charge carriers transfer from CsPbBr3 to Bi2O2Se. The waveguide characterization shows that the epitaxial CsPbBr3 wires may efficiently confine and guide their emission, which favors the light absorption of Bi2O2Se. Importantly, the photocurrent mapping and spectra of the devices based on these 2D/1D heterostructures prove that the epitaxial CsPbBr3 wires remarkably enhances the photoresponse of Bi2O2Se, which indicates these heterostructures can be applied in high‐performance optoelectronic devices or on‐chip integrated photonic circuits.

Van der Waals Epitaxy of Bi2Te2Se/Bi2O2Se Vertical Heterojunction for High Performance Photodetector

“…Attempts have been made to improve the optoelectronic properties of Bi 2 O 2 Se photodetectors by constructing Bi 2 O 2 Se based heterojunctions with other 2D materials. [ 20,22–25 ] The charge transfer and accelerated carrier separation rate at the heterojunction interface can contribute to lower dark current and faster photoresponse speed in the heterojunction photodetector. [ 26–29 ] For example, Shan et al.…”

Charge Transfer Properties of Heterostructures Formed by Bi2O2Se and Transition Metal Dichalcogenide Monolayers

“…Recent efforts on combining two or more 2D materials have produced many artificial heterostructures with novel properties. [ 15 ] On this topic, integration of Bi 2 O 2 Se with other materials has been recently discussed, including 2D materials of graphene, [ 16 ] MoSe, [ 17 ] and WSe 2 , [ 18 ] 1D CsPbBr 3 nanowires, [ 19 ] and 0D PbSe quantum dots. [ 20 ] However, the physical mechanisms governing the electronic properties of such heterostructures are less discussed.…”

Mixed-Dimensional Heterostructure of CsPbBr3 Nanocrystal and Bi2O2Se Nanosheet

“…Similar type-I charge transfer has been obtained previously in different heterostructures involving CsPbBr 3 . 15,23,30,48 ■ CONCLUSIONS In summary, we have successfully demonstrated a facile solution-based synthesis approach to form mixed-dimensional heterostructures of CsPbBr 3 NCs and Bi 2 O 2 Se NSs and investigated the optical properties and the nature of photogenerated charge transfer both at room temperature and 77 K. A significant PL quenching of CsPbBr 3 NCs is evidenced when it forms a heterostructure with Bi 2 O 2 Se NSs. The timeresolved PL techniques were employed to understand the quenching behaviors, which indicates that both the dynamic and static quenching pathways contribute.…”

“…Recently, an emergent 2D layered material, Bi 2 O 2 Se, has shown noticeable potential in device applications, for instance, phototransistors, ultrafast photodetection, and ferroelectrcity, 26−29 owing to its characteristic narrow band gap, good air stability, local structural distortion, and high carrier mobility. 30 Thus, for highperformance optoelectronic applications, fabricating Bi with PbSe QDs in the form of mixed-dimensional 2D/0D heterostructures was utilized as high-performance and broadband photodetectors. 31 However, studies involving Bi 2 O 2 Sebased mixed-dimensional heterostructures are still in the early stage.…”