Epitaxial Growth of Vertically Aligned Antimony Selenide Nanorod Arrays for Heterostructure Based Self‐Powered Photodetector. Issue 19 (18th July 2022)

• Record Type: Journal Article
• Authors: Cao, Yu; Qu, Peng; Wang, Changgang; Zhou, Jing; Li, Minghao; Yu, Xiaoming; Yu, Xuan; Pang, Jinbo; Zhou, Weijia; Liu, Hong; Cuniberti, Gianaurelio
• Is Part Of: Advanced optical materials. Volume 10:Issue 19(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-18
• Subjects: antimony selenide -- charge carrier transport -- heterostructures -- optoelectronic response -- self‐powered photodetector; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202200816
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Antimony selenide (Sb2 Se3 ) has garnered significant attention with its extraordinary optical and optoelectronic properties for optical and optoelectronic devices such as broadband photodetectors. The trends emerge in the synthesis of Sb2 Se3 over a semiconducting substrate for the direct formation of heterostructures, which facilitate a pn junction for self‐powered photodetector. 1D Sb2 Se3 nanorods are preferred to boost the charge carrier transport along the longitudinal direction as well as the optical absorption by light trapping. Great challenges remain for the vertical growth of nanorods. In this work, the precisely vertical alignment of Sb2 Se3 nanorod arrays has been achieved in an epitaxial growth manner by selecting a lattice‐matching substrate, namely, boron‐doped ZnO (110) surface. The directly grown boron‐doped ZnO/Sb2 Se3 nanorod arrays heterostructure leads to a high‐performance broadband photodetector. Eventually, the device demonstrates extraordinary figure‐of‐merit parameters, i.e., responsivity, on/off ratio, and specific detectivity. Furthermore, device simulation predicts the theoretical limit of the photodetector performances on the condition of suppressed defect density of the Sb2 Se3 . These results may shed light on the investigation of controlled growth of low‐dimensional materials, self‐powered photodetectors, and related optic and optoelectronic devices. Abstract : Precisely vertically aligned nanorod arrays are grown over an epitaxial substrate such as boron doped ZnO (110). The 1D morphology allows for the transport of charge carriers along the longitudinal direction of nanorods. Then the naturally formed ZnO:B/Sb2 Se3 heterostructure leads to the fabrication of heterojunction‐based photodetector, which shows exceeding performances. Device simulation predicts the theoretical limit of such a heterostructure for future investigation.