Browsing by Author "Yang, Zongyin"

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  • Black phosphorus ink formulation for inkjet printing of optoelectronics and photonics
    (2017-12-01) Hu, Guohua; Albrow-Owen, Tom; Jin, Xinxin; Ali, Ayaz; Hu, Yuwei; Howe, Richard C.T.; Shehzad, Khurram; Yang, Zongyin; Zhu, Xuekun; Woodward, Robert I.; Wu, Tien Chun; Jussila, Henri; Wu, Jiang Bin; Peng, Peng; Tan, Ping Heng; Sun, Zhipei; Kelleher, Edmund J.R.; Zhang, Meng; Xu, Yang; Hasan, Tawfique
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Black phosphorus is a two-dimensional material of great interest, in part because of its high carrier mobility and thickness dependent direct bandgap. However, its instability under ambient conditions limits material deposition options for device fabrication. Here we show a black phosphorus ink that can be reliably inkjet printed, enabling scalable development of optoelectronic and photonic devices. Our binder-free ink suppresses coffee ring formation through induced recirculating Marangoni flow, and supports excellent consistency (< 2% variation) and spatial uniformity (< 3.4% variation), without substrate pre-treatment. Due to rapid ink drying (< 10 s at < 60 °C), printing causes minimal oxidation. Following encapsulation, the printed black phosphorus is stable against long-term (> 30 days) oxidation. We demonstrate printed black phosphorus as a passive switch for ultrafast lasers, stable against intense irradiation, and as a visible to near-infrared photodetector with high responsivities. Our work highlights the promise of this material as a functional ink platform for printed devices.
  • Broadband miniaturized spectrometers with a van der Waals tunnel diode
    (2024-01-17) Uddin, Md Gius; Das, Susobhan; Shafi, Abde Mayeen; Wang, Lei; Cui, Xiaoqi; Nigmatulin, Fedor; Ahmed, Faisal; Liapis, Andreas C.; Cai, Weiwei; Yang, Zongyin; Lipsanen, Harri; Hasan, Tawfique; Yoon, Hoon Hahn; Sun, Zhipei
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Miniaturized spectrometers are of immense interest for various on-chip and implantable photonic and optoelectronic applications. State-of-the-art conventional spectrometer designs rely heavily on bulky dispersive components (such as gratings, photodetector arrays, and interferometric optics) to capture different input spectral components that increase their integration complexity. Here, we report a high-performance broadband spectrometer based on a simple and compact van der Waals heterostructure diode, leveraging a careful selection of active van der Waals materials- molybdenum disulfide and black phosphorus, their electrically tunable photoresponse, and advanced computational algorithms for spectral reconstruction. We achieve remarkably high peak wavelength accuracy of ~2 nanometers, and broad operation bandwidth spanning from ~500 to 1600 nanometers in a device with a ~ 30×20 μm2 footprint. This diode-based spectrometer scheme with broadband operation offers an attractive pathway for various applications, such as sensing, surveillance and spectral imaging.
  • A general ink formulation of 2D crystals for wafer-scale inkjet printing
    (2020-08-01) Hu, Guohua; Yang, Lisong; Yang, Zongyin; Wang, Yubo; Jin, Xinxin; Dai, Jie; Wu, Qing; Liu, Shouhu; Zhu, Xiaoxi; Wang, Xiaoshan; Wu, Tien Chun; Howe, Richard C.T.; Albrow-Owen, Tom; Ng, Leonard W.T.; Yang, Qing; Occhipinti, Luigi G.; Woodward, Robert I.; Kelleher, Edmund J.R.; Sun, Zhipei; Huang, Xiao; Zhang, Meng; Bain, Colin D.; Hasan, Tawfique
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Recent advances in inkjet printing of two-dimensional (2D) crystals show great promise for next-generation printed electronics development. Printing nonuniformity, however, results in poor reproducibility in device performance and remains a major impediment to their large-scale manufacturing. At the heart of this challenge lies the coffee-ring effect (CRE), ring-shaped nonuniform deposits formed during postdeposition drying. We present an experimental study of the drying mechanism of a binary solvent ink formulation. We show that Marangoni-enhanced spreading in this formulation inhibits contact line pinning and deforms the droplet shape to naturally suppress the capillary flows that give rise to the CRE. This general formulation supports uniform deposition of 2D crystals and their derivatives, enabling scalable and even wafer-scale device fabrication, moving them closer to industrial-level additive manufacturing.
  • Miniaturized spectrometers with a tunable van der Waals junction
    (2022-10-21) Yoon, Hoon Hahn; Fernandez, Henry A.; Nigmatulin, Fedor; Cai, Weiwei; Yang, Zongyin; Cui, Hanxiao; Ahmed, Faisal; Cui, Xiaoqi; Uddin, Md Gius; Minot, Ethan D.; Lipsanen, Harri; Kim, Kwanpyo; Hakonen, Pertti; Hasan, Tawfique; Sun, Zhipei
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Miniaturized computational spectrometers, which can obtain incident spectra using a combination of device spectral responses and reconstruction algorithms, are essential for on-chip and implantable applications. Highly sensitive spectral measurement using a single detector allows the footprints of such spectrometers to be scaled down while achieving spectral resolution approaching that of benchtop systems. We report a high-performance computational spectrometer based on a single van der Waals junction with an electrically tunable transport-mediated spectral response. We achieve high peak wavelength accuracy (similar to 0.36 nanometers), high spectral resolution (similar to 3 nanometers), broad operation bandwidth (from similar to 405 to 845 nanometers), and proof-of-concept spectral imaging. Our approach provides a route toward ultraminiaturization and offers unprecedented performance in accuracy, resolution, and operation bandwidth for single-detector computational spectrometers.
  • Single-nanowire spectrometers
    (2019-09-06) Yang, Zongyin; Albrow-Owen, Tom; Cui, Hanxiao; Alexander-Webber, Jack; Gu, Fuxing; Wang, Xiaomu; Wu, Tien Chun; Zhuge, Minghua; Williams, Calum; Wang, Pan; Zayats, Anatoly V.; Cai, Weiwei; Dai, Lun; Hofmann, Stephan; Overend, Mauro; Tong, Limin; Yang, Qing; Sun, Zhipei; Hasan, Tawfique
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Spectrometers with ever-smaller footprints are sought after for a wide range of applications in which minimized size and weight are paramount, including emerging in situ characterization techniques. We report on an ultracompact microspectrometer design based on a single compositionally engineered nanowire. This platform is independent of the complex optical components or cavities that tend to constrain further miniaturization of current systems. We show that incident spectra can be computationally reconstructed from the different spectral response functions and measured photocurrents along the length of the nanowire. Our devices are capable of accurate, visible-range monochromatic and broadband light reconstruction, as well as spectral imaging from centimeter-scale focal planes down to lensless, single-cell-scale in situ mapping.