title: Self-rolling and light-trapping in flexible quantum well-embedded nanomembranes for wide-angle infrared photodetectors.
abstract: Three-dimensional (3D) design and manufacturing enable flexible nanomembranes to deliver unique properties and applications in flexible electronics, photovoltaics, and photonics. We demonstrate that a quantum well (QW)-embedded nanomembrane in a rolled-up geometry facilitates a 3D QW infrared photodetector (QWIP) device with enhanced responsivity and detectivity. Circular geometry of nanomembrane rolls provides the light coupling route; thus, there are no external light coupling structures, which are normally necessary for QWIPs. This 3D QWIP device under tube-based light-trapping mode presents broadband enhancement of coupling efficiency and omnidirectional detection under a wide incident angle (±70°), offering a unique solution to high-performance focal plane array. The winding number of these rolled-up QWIPs provides well-tunable blackbody photocurrents and responsivity. 3D self-assembly of functional nanomembranes offers a new path for high conversion efficiency between light and electricity in photodetectors, solar cells, and light-emitting diodes.
authors.affiliation: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai 200083, China.; University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China.
authors.forename: Han
authors.initials: H
authors.lastname: Wang
authors.affiliation: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai 200083, China.
authors.forename: Honglou
authors.initials: H
authors.lastname: Zhen
authors.affiliation: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai 200083, China.
authors.forename: Shilong
authors.initials: S
authors.lastname: Li
authors.affiliation: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai 200083, China.; University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China.
authors.forename: Youliang
authors.initials: Y
authors.lastname: Jing
authors.affiliation: Department of Materials Science, Fudan University, 220 Handan Road, Shanghai 200433, China.
authors.forename: Gaoshan
authors.initials: G
authors.lastname: Huang
authors.affiliation: Department of Materials Science, Fudan University, 220 Handan Road, Shanghai 200433, China.
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Mei
authors.affiliation: National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai 200083, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Lu
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods; D007259:Infrared Rays; D008567:Membranes, Artificial; D049329:Nanostructures; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods; D045663:Quantum Dots
chemical_list: D008567:Membranes, Artificial
keywords: Nanomembrane; infrared photodetector; light-trap; quantum well; rolled-up nanotechnology