Sensors and biosensors articles within Nature Photonics

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• Article | 11 January 2024

  Efficient and ultrafast organic scintillators by hot exciton manipulation

  Researchers overcome the typical scintillator trade-off between high efficiency and speed. In organic scintillators, researchers drove hot excitons into fast singlet emission states without involving the lowest triplet states, which led to a fast radiative lifetime and strong light yield that may be applicable to ultrafast detection and imaging.

  • Xinyuan Du
  • , Shan Zhao
  •  & Jiang Tang

• Article | 08 January 2024

  Surface-defect-passivation-enabled near-unity charge collection efficiency in bromide-based perovskite gamma-ray spectrum devices

  Ammonium bromide is shown to passivate deep traps on FAPbBr₃ surfaces, improving the charge collection efficiency to near unity in perovskite gamma-ray devices. The approach yielded tenfold improvements in dark current, and the energy resolution of ¹³⁷Cs spectra acquired using FAPbBr₃ detectors was improved from 5.7% to 1.7%.

  • Liang Zhao
  • , Zhifang Shi
  •  & Jinsong Huang

• Article | 09 February 2023

  High-yield growth of FACsPbBr₃ single crystals with low defect density from mixed solvents for gamma-ray spectroscopy

  Centimetre-sized formamidinium-caesium lead bromide (FACsPbBr₃) single crystals were grown at high yield from low-purity precursors. High (84%) charge collection efficiency and energy resolution (2.9% for 662 keV ¹³⁷Cs) for γ-rays were demonstrated.

  • Liang Zhao
  • , Ying Zhou
  •  & Jinsong Huang

• Article
  18 July 2022 | Open Access

  Synergistic strain engineering of perovskite single crystals for highly stable and sensitive X-ray detectors with low-bias imaging and monitoring

  X-ray detectors based on dual-site-doped perovskite single crystals exhibit excellent sensitivity of 2.6 × 10⁴ μC Gy_air⁻¹ cm^–2 under a low field of 1 V cm^–1. The detectable dose rate is as low as 7.09 nGy_air s^–1. The operational stability is beyond half a year.

  • Jizhong Jiang
  • , Min Xiong
  •  & Feng Gao

• Letter | 02 June 2022

  Nanokelvin-resolution thermometry with a photonic microscale sensor at room temperature

  A microscale optical thermometer with nanokelvin sensitivity makes use of the temperature dependence of the band-edge absorption in GaAs.

  • Amin Reihani
  • , Edgar Meyhofer
  •  & Pramod Reddy

• Review Article | 23 December 2021

  Detecting ionizing radiation using halide perovskite semiconductors processed through solution and alternative methods

  X-ray detectors based on solution-processed metal halide perovskites are reviewed. Promising materials, fabrication techniques and device architectures are discussed, as is the potential for medical imaging applications.

  • Yihui He
  • , Ido Hadar
  •  & Mercouri G. Kanatzidis

• Article | 07 December 2020

  CsPbBr₃ perovskite detectors with 1.4% energy resolution for high-energy γ-rays

  Energy resolution of high-energy photon detectors is desired for applications ranging from biomedical imaging to homeland security. In this work, perovskite-based γ-ray detection with 1.4% energy resolution is demonstrated.

  • Yihui He
  • , Matthew Petryk
  •  & Mercouri G. Kanatzidis

• Article | 17 August 2020

  Perovskite-filled membranes for flexible and large-area direct-conversion X-ray detector arrays

  Perovskite-filled-membranes enable flexible, sensitive and large-area X-ray detectors. The structures are made by infiltrating perovskite solution into porous polymer membranes.

  • Jingjing Zhao
  • , Liang Zhao
  •  & Jinsong Huang

• Letter | 17 June 2019

  Ultra-low-power sub-photon-voltage high-efficiency light-emitting diodes

  By using a single-quantum-well active region with a unique well–cladding design to suppress non-radiative recombination and enhance radiative recombination, light-emitting diodes with close to unity internal quantum efficiency at a low current density of <10⁻⁴ A cm⁻² are demonstrated.

  • Ning Li
  • , Kevin Han
  •  & Devendra Sadana

• Article | 17 June 2019

  Highly sensitive X-ray detector made of layered perovskite-like (NH₄)₃Bi₂I₉ single crystal with anisotropic response

  Perovskite-like materials enable different X-ray detection performance along different crystal directions. A low detection limit of 55 nGy_air s⁻¹ is demonstrated.

  • Renzhong Zhuang
  • , Xueji Wang
  •  & Yang (Michael) Yang

• Article | 27 August 2018

  Polarization-resolved black phosphorus/molybdenum disulfide mid-wave infrared photodiodes with high detectivity at room temperature

  Black phosphorus/molybdenum disulfide mid-wave infrared photodiodes with external quantum efficiencies of 35% across 2.5–3.5 μm at room temperature and a peak detectivity of 1.1 × 10¹⁰ cm Hz^1/2 W^–1 at 3.8 μm are demonstrated.

  • James Bullock
  • , Matin Amani
  •  & Ali Javey

• Article | 02 October 2017

  Cs₂AgBiBr₆ single-crystal X-ray detectors with a low detection limit

  Double perovskite Cs₂AgBiBr₆ single crystals are used to make a sensitive X-ray detector. The device exhibits a high sensitivity of 105 µC Gy_air ⁻¹ cm⁻² and a low detection limit of 59.7 nGy_airs⁻¹, and demonstrates long-term operational stability.

  • Weicheng Pan
  • , Haodi Wu
  •  & Jiang Tang

• Article | 19 June 2017

  High-performance direct conversion X-ray detectors based on sintered hybrid lead triiodide perovskite wafers

  Methyl ammonium lead triiodide perovskite wafers for application in direct conversion X-ray detectors are fabricated by a room-temperature sintering process. A conversion efficiency of 2,527 mC Gy_aircm^–2 under 70 kVp X-ray exposure is obtained.

  • Shreetu Shrestha
  • , René Fischer
  •  & Christoph J. Brabec

• Article | 29 May 2017

  Broadband image sensor array based on graphene–CMOS integration

  Graphene–quantum dots on CMOS sensor offers broadband imaging.

  • Stijn Goossens
  • , Gabriele Navickaite
  •  & Frank Koppens

• Article | 17 April 2017

  Monolithic integration of hybrid perovskite single crystals with heterogenous substrate for highly sensitive X-ray imaging

  Hybrid perovskite crystals are integrated onto silicon wafers enabling fabrication of an X-ray linear detector array. High sensitivity may reduce patient dose in medical imaging applications.

  • Wei Wei
  • , Yang Zhang
  •  & Jinsong Huang

• Article | 20 February 2017

  Charge-integrating organic heterojunction phototransistors for wide-dynamic-range image sensors

  A solution-processed organic phototransistor is operated at 100-frame-per-second rates with external quantum efficiencies above 100%. Dynamic range as high as 103 dB was shown for 30-frame-per-second operation.

  • Adrien Pierre
  • , Abhinav Gaikwad
  •  & Ana Claudia Arias

• Letter | 25 July 2016

  Detection of gamma photons using solution-grown single crystals of hybrid lead halide perovskites

  Cheap and sensitive gamma-ray detectors are desired for defence, medical and research applications. Solid-state gamma-radiation detectors made from solution-grown perovskites have now been demonstrated for multiple practical applications.

  • Sergii Yakunin
  • , Dmitry N. Dirin
  •  & Maksym V. Kovalenko

• News & Views | 28 April 2016

  Perovskites target X-ray detection

  Single crystals of perovskites are currently of interest to help fathom fundamental physical parameters limiting the performance of perovskite-based polycrystalline solar cells. Now, such perovskites offer a technology platform for optoelectronic devices, such as cheap and sensitive X-ray detectors.

  • Wolfgang Heiss
  •  & Christoph Brabec

• Article | 21 March 2016

  Sensitive X-ray detectors made of methylammonium lead tribromide perovskite single crystals

  Single-crystal perovskite devices 2–3 mm thick exhibit 16.4% X-ray detection efficiency with sensitivity four times higher than α-Se X-ray detectors.

  • Haotong Wei
  • , Yanjun Fang
  •  & Jinsong Huang

• Article | 09 November 2015

  X-ray imaging with scintillator-sensitized hybrid organic photodetectors

  A 256 × 256 pixel scintillator-based X-ray detector that improves resolution by limiting optical cross-talk is made using terbium-doped gadolinium oxysulfide scintillator particles in an organic photodetector matrix.

  • Patric Büchele
  • , Moses Richter
  •  & Oliver Schmidt

• Article | 14 September 2015

  Filterless narrowband visible photodetectors

  Photodiodes with an intrinsic narrow spectral response make it possible to discriminate between red, green and blue light without the need for any optical filters.

  • Qianqian Lin
  • , Ardalan Armin
  •  & Paul Meredith

• Article | 31 August 2015

  Highly narrowband perovskite single-crystal photodetectors enabled by surface-charge recombination

  Perovskite-based devices typically exhibit broadband spectral responses. Here narrowband (< 20 nm FWHM) response is achieved for a photodetector application.

  • Yanjun Fang
  • , Qingfeng Dong
  •  & Jinsong Huang

• News & Views | 27 August 2015

  Magnetic opportunities

  • Oliver Graydon

• Research Highlights | 28 February 2014

  Magnetic-field sensor

  • Simon Pleasants

• Research Highlights | 29 August 2013

  Visible blind detector

  • Simon Pleasants

• Article | 11 August 2013

  High-resolution electroluminescent imaging of pressure distribution using a piezoelectric nanowire LED array

  An array of piezoelectric nanowire LEDs with a pixel density of 6,350 dpi is capable of mapping two-dimensional pressure distributions with a spatial resolution of 2.7 micrometres. Pressure alters the light emissions from the LEDs, which are then imaged. Possible applications include artificial skin, robotics and touchpads.

  • Caofeng Pan
  • , Lin Dong
  •  & Zhong Lin Wang