Self‐rolled‐up Ultrathin Single‐Crystalline Silicon Nanomembranes for On‐Chip Tubular Polarization Photodetectors
Self‐rolled‐up Ultrathin Single‐Crystalline Silicon Nanomembranes for On‐Chip Tubular Polarization Photodetectors
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DOI：
10.1002/adma.202306715
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Yongfeng Mei
中科院分区：
文献类型：
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作者：
Binmin Wu;Ziyu Zhang;Zhi Zheng;Tianjun Cai;Chunyu You;Chang Liu;Xing Li;Yang Wang;Jinlong Wang;Hongbin Li;Enming Song;Jizhai Cui;Gaoshan Huang;Yongfeng Mei
AbstractFreestanding single‐crystalline nanomembranes and their assembly have broad application potential in photodetectors for integrated chips. However, the release and self‐assembly process of single‐crystalline semiconductor nanomembranes still remains great challenges in on‐chip processing and functional integration, and photodetectors based on nanomembrane always suffer from limited absorption of nanoscale thickness. Here, we employ a non‐destructive releasing and rolling process to prepare tubular photodetectors based on freestanding single‐crystalline Si nanomembranes. Spontaneous release and self‐assembly are achieved by residual strain introduced by lattice mismatch at the epitaxial interface of Si and Ge, and the intrinsic stress and strain distributions in self‐rolled‐up Si nanomembranes are analyzed experimentally and computationally. The advantages of light trapping and wide‐angle optical coupling are realized by tubular geometry. Our Si microtube device achieves reliable Ohmic contact and exhibits a photoresponsivity of over 330 mA/W, a response time of 370 μs, and a light incident detection angle range of over 120°. Furthermore, the microtubular structure shows a distinct polarization angle‐dependent light absorption, with a dichroic ratio of 1.24 achieved at 940 nm. The proposed Si‐based microtubes provide new possibilities for the construction of multifunctional chips for integrated circuit ecosystems in More than Moore era.This article is protected by copyright. All rights reserved
