Featured
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Article |
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
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Article
| Open Access
Stable perovskite single-crystal X-ray imaging detectors with single-photon sensitivity
We show perovskite X-ray detection at zero-voltage bias with operational device stability exceeding one year. Detection efficiency of 88% and noise-equivalent dose of 90 pGyair are obtained with 18 keV X-rays, allowing single-photon-sensitive, low-dose and energy-resolved X-ray imaging.
- Kostiantyn Sakhatskyi
- , Bekir Turedi
- & Maksym V. Kovalenko
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Article |
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
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Article |
Polyatomic molecules with emission quantum yields >20% enable efficient organic light-emitting diodes in the NIR(II) window
A new series of self-assembled Pt(II) complexes with high emission quantum yields enables OLEDs with a maximum emission wavelength of 995 nm and an external quantum efficiency of 4.3%.
- Sheng-Fu Wang
- , Bo-Kang Su
- & Pi-Tai Chou
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Article |
Ultrastable near-infrared perovskite light-emitting diodes
Near-infrared perovskite light-emitting diodes with extrapolated device lifespans on the scale of years are achieved by the use of a dipolar molecular stabilizer.
- Bingbing Guo
- , Runchen Lai
- & Dawei Di
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Article
| 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 Gyair−1 cm–2 under a low field of 1 V cm–1. The detectable dose rate is as low as 7.09 nGyair s–1. The operational stability is beyond half a year.
- Jizhong Jiang
- , Min Xiong
- & Feng Gao
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Letter |
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
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Article |
Room-temperature electrically switchable spin–valley coupling in a van der Waals ferroelectric halide perovskite with persistent spin helix
Researchers demonstrate a persistent spin helix in an organic–inorganic hybrid ferroelectric halide perovskite whose layered nature makes it intrinsically like a quantum well. They demonstrate a switchable spin-polarized band structure via an intrinsic ferroelectric field.
- Lifu Zhang
- , Jie Jiang
- & Jian Shi
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Article |
A ferroelectric multilevel non-volatile photonic phase shifter
Researchers demonstrate a multilevel non-volatile phase shifter memory that is based on the monolithic integration of BaTiO3 thin films and silicon waveguides. By manipulating ferroelectric domains in BaTiO3 with electrical control signals, they achieve analogue and non-volatile optical phase tuning.
- Jacqueline Geler-Kremer
- , Felix Eltes
- & Stefan Abel
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Article |
Solution-processed green and blue quantum-dot light-emitting diodes with eliminated charge leakage
A new strategy to reduce charge leakage in quantum-dot light-emitting diodes enables high external quantum efficiencies of 28.7% and 21.9% and excellent T95 lifetimes of 580,000 h and 4,400 h for green and blue devices, respectively.
- Yunzhou Deng
- , Feng Peng
- & Yizheng Jin
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Article |
Quantum-size-tuned heterostructures enable efficient and stable inverted perovskite solar cells
A scheme to control the confinement within 2D/3D perovskite heterostructures results in stable, efficient inverted perovskite solar cells.
- Hao Chen
- , Sam Teale
- & Edward H. Sargent
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Article |
Exceptionally stable blue phosphorescent organic light-emitting diodes
New dopant and host materials yield a deep blue phosphorescent organic light-emitting diode with a lifetime exceeding 1,000 h.
- Jinwon Sun
- , Heechoon Ahn
- & Sunghan Kim
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Review Article |
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
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Article |
Efficient and stable organic light-emitting devices employing phosphorescent molecular aggregates
A tetradentate Pd(ii) complex with near unity photoluminescent quantum yield is the basis of bright, long-lifetime organic LEDs.
- Linyu Cao
- , Kody Klimes
- & Jian Li
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Article |
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
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Article |
High-power portable terahertz laser systems
GaAs-based terahertz quantum cascade lasers emitting around 4 THz are demonstrated up to 250 K without a magnetic field. To elevate the operation temperature, carrier leakage channels are reduced by carefully designing the quantum well structures.
- Ali Khalatpour
- , Andrew K. Paulsen
- & Qing Hu
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Review Article |
Variable optical elements for fast focus control
Recent improvements of the operation speed of variable optical elements are reviewed with an emphasis on components with microsecond focus-varying response time.
- SeungYeon Kang
- , Martí Duocastella
- & Craig B. Arnold
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Article |
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
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Article |
Fast spin-flip enables efficient and stable organic electroluminescence from charge-transfer states
An organic molecule, 5Cz-TRZ, with multiple donor units supports fast reverse intersystem crossing, allowing fabrication of high-performance organic light-emitting diodes.
- Lin-Song Cui
- , Alexander J. Gillett
- & Richard H. Friend
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Letter |
Large-area near-infrared perovskite light-emitting diodes
Near-infrared LEDs as large as 30 × 30 mm2 in size are fabricated on both rigid and flexible substrates.
- Xiaofei Zhao
- & Zhi-Kuang Tan
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Article |
Photodoping through local charge carrier accumulation in alloyed hybrid perovskites for highly efficient luminescence
Localized photodoping in mixed-cation perovskites is shown to modify charge-carrier recombination and thus offer a route for more efficient light emission.
- Sascha Feldmann
- , Stuart Macpherson
- & Felix Deschler
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Article |
Efficient and stable single-layer organic light-emitting diodes based on thermally activated delayed fluorescence
Long-lived, efficient organic light-emitting diodes based on a simple design of a single layer of an active light-emitting medium sandwiched between two contacts and no additional charge injection and transport layers are reported.
- Naresh B. Kotadiya
- , Paul W. M. Blom
- & Gert-Jan A. H. Wetzelaer
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Letter |
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
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Article |
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 nGyair s−1 is demonstrated.
- Renzhong Zhuang
- , Xueji Wang
- & Yang (Michael) Yang
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Article |
Controlling competing photochemical reactions stabilizes perovskite solar cells
The photo-instability of perovskite solar cells is investigated and controlled by the use of a passivation strategy.
- Silvia G. Motti
- , Daniele Meggiolaro
- & Annamaria Petrozza
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Article |
Highly efficient blue thermally activated delayed fluorescence emitters based on symmetrical and rigid oxygen-bridged boron acceptors
The discovery of two deep-blue organic emitters of light could aid the development of next-generation organic light-emitting devices.
- Dae Hyun Ahn
- , Si Woo Kim
- & Jang Hyuk Kwon
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Article |
Strategies towards rational design of gold(iii) complexes for high-performance organic light-emitting devices
Cyclometalated gold(iii) complexes are shown to offer tunable emission colours spanning from sky-blue to red and enable the fabrication of phosphorescent organic light-emitting devices with high external quantum efficiency and long lifetimes.
- Lok-Kwan Li
- , Man-Chung Tang
- & Vivian Wing-Wah Yam
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Article |
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 Hz1/2 W–1 at 3.8 μm are demonstrated.
- James Bullock
- , Matin Amani
- & Ali Javey
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Letter |
Large magneto-optical Kerr effect and imaging of magnetic octupole domains in an antiferromagnetic metal
The magneto-optical Kerr effect is demonstrated in an antiferromagnetic metal. Large rotation angles, magnetic octupole domain imaging was enabled.
- Tomoya Higo
- , Huiyuan Man
- & Satoru Nakatsuji
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Article |
High-efficiency electroluminescence and amplified spontaneous emission from a thermally activated delayed fluorescent near-infrared emitter
Near-infrared organic light-emitting diodes that operate in the 700 nm region with an external quantum efficiency of almost 10% are reported.
- Dae-Hyeon Kim
- , Anthony D’Aléo
- & Chihaya Adachi
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Letter |
Reversible optical control of macroscopic polarization in ferroelectrics
Ferroelectric domains are optically reconfigured by a reversible process. The tuning is sufficient to enable macroscopically observable responses and the findings may help lead to the development of photo-stimulated ferroelectric devices.
- Fernando Rubio-Marcos
- , Diego A. Ochoa
- & José E. García
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Article |
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 Gyair −1 cm−2 and a low detection limit of 59.7 nGyairs−1, and demonstrates long-term operational stability.
- Weicheng Pan
- , Haodi Wu
- & Jiang Tang
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Letter |
Efficient low-loss InGaAsP/Si hybrid MOS optical modulator
Hybrid InGaAsP/Si optical modulator gives silicon photonics an efficient scheme for phase modulation.
- Jae-Hoon Han
- , Frederic Boeuf
- & Mitsuru Takenaka
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Article |
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 Gyaircm–2 under 70 kVp X-ray exposure is obtained.
- Shreetu Shrestha
- , René Fischer
- & Christoph J. Brabec
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Article |
Broadband image sensor array based on graphene–CMOS integration
Graphene–quantum dots on CMOS sensor offers broadband imaging.
- Stijn Goossens
- , Gabriele Navickaite
- & Frank Koppens
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Article |
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
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Article |
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
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Article |
Efficient perovskite light-emitting diodes featuring nanometre-sized crystallites
Perovskite nanocrystal LEDs featuring long-chain ammonium cations offer improved stability and efficiency.
- Zhengguo Xiao
- , Ross A. Kerner
- & Barry P. Rand
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Letter |
Optical determination of the Néel vector in a CuMnAs thin-film antiferromagnet
Due to their nature antiferromagnets are difficult to probe with conventional magnetometers. The Néel vector of a practically important antiferromagnet, CuMnAs, has now been determined by a femtosecond pump–probe magneto-optical experiment.
- V. Saidl
- , P. Němec
- & T. Jungwirth
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Letter |
Perovskite light-emitting diodes based on solution-processed self-organized multiple quantum wells
Perovskite quantum wells yield highly efficient LEDs spanning the visible and near-infrared.
- Nana Wang
- , Lu Cheng
- & Wei Huang
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Letter |
Reversible optical switching of antiferromagnetism in TbMnO3
Laser-controlled writing and erasure of antiferromagnetic domains in multiferroic TbMnO3 using light pulses of two different colours is demonstrated.
- Sebastian Manz
- , Masakazu Matsubara
- & Manfred Fiebig
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Letter |
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
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News & Views |
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
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Article |
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
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Article |
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
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Article |
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
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Article |
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
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Efficient and ultrafast organic scintillators by hot exciton manipulation
Magnetic opportunities