Search results for: Deren Yang

Items from 1 to 20 out of 446 results

article

HCOO⁻ Doping‐Induced Multiexciton Emissions in Cs₃Cu₂I₅ Crystals for Efficient X‐Ray Scintillation

Zisheng Wang, Lixiang Wang, Jiahao Xie, Yang Yang, more

Small > 20 > 33 > n/a - n/a

Self‐trapped exciton (STE) luminescence, typically associated with structural deformation of excited states, has attracted significant attention in metal halide materials recently. However, the mechanism of multiexciton STE emissions in certain metal halide crystals remains largely unexplored. This study investigates dual luminescence emissions in HCOO⁻ doped Cs₃Cu₂I₅ single crystals using transient...

article

Electroluminescence from Silicon‐Based Light‐Emitting Devices with Erbium‐Doped Ta₂O₅ Films

Chengtao Xia, Ziwei Wang, Shuming Jiang, Ran Ji, more

physica status solidi (RRL) – Rapid Research Letters > 18 > 8 > n/a - n/a

The visible and near‐infrared (NIR) electroluminescence (EL) from the light‐emitting device (LED) based on the erbium (Er)‐doped Ta₂O₅ (Ta₂O₅:Er)/SiO₂/Si structure is reported in this study. Wherein, an ≈10 nm thick SiO₂ intermediate layer serves as an energy plateau for forming hot electrons, which initially transport from Si via trap‐assisted tunneling mechanism under sufficiently forward bias with...

article

Numerical Simulation of the Transport of Gas Species in the PVT Growth of Single‐Crystal SiC

Binjie Xu, Xuefeng Han, Suocheng Xu, Deren Yang, more

Crystal Research and Technology > 59 > 7 > n/a - n/a

Single‐crystal silicon carbide (SiC) is an important semiconductor material for the fabrication of power and radio frequency (RF) devices. The major technique for growing single‐crystal SiC is the so‐called physical vapor transport (PVT) method, in which not only the thermal field but also the fluid‐flow field and the distribution of gas species can be hardly measured directly. In this study, a multi‐component...

article

Dielectric Regulation for Efficient Top‐Emission Perovskite Light‐Emitting Diodes with Suppressed Efficiency Roll‐off

Minxing Yan, Lingfeng Zhou, Lixiang Wang, Guangjie Luo, more

Small > 20 > 18 > n/a - n/a

Perovskite light‐emitting diodes (PeLEDs) have shown incalculable application potential in the fields of next‐generation displays and light communication owing to the rapidly increased external quantum efficiencies (EQEs). However, most PeLEDs obtain a maximum EQE at small current density (J) region and suffer from severe efficiency roll‐off in different extents. Herein, it is demonstrated that the...

article

Young's Modulus Characterization of Nano‐Level Silicon Nanomembrane

Xiaodong Zhu, Jiajun Li, Huibing Yang, Fengbo Zhu, more

physica status solidi (RRL) – Rapid Research Letters > 18 > 3 > n/a - n/a

Silicon nanomembrane (SiNM) has drawn great attention for the application in nanoelectrical devices as it shows excellent flexibility and is compatible with the integrated circuit process. The mechanical property measurement of the SiNM with nanoscale thickness is critical. A suspended SiNM (40 nm thick) for mechanical measurements is fabricated by transferring a chemically etched ultrathin monocrystalline...

article

The Mechanism Behind the Annealing‐Induced Reduction of Infrared Absorption in Zinc‐Hyperdoped Silicon

Zechen Hu, Jiawei Fu, Li Cheng, Degong Ding, more

physica status solidi (a) > 221 > 5 > n/a - n/a

Pulsed laser hyperdoping is widely investigated as an effective method for expanding the infrared absorption of silicon. Prior to further device fabrication, thermal treatment is commonly applied to hyperdoped silicon to repair lattice defects and activate dopants. However, it is observed that thermal treatment adversely affects the infrared absorption of hyperdoped silicon, and the underlying mechanisms...

article

Lattice‐Gradient Perovskite KTaO₃ Films for an Ultrastable and Low‐Dose X‐Ray Detector

Liqi Li, Xuchao Fang, Zijun Zhang, Qian Yang, more

Advanced Materials > 35 > 47 > n/a - n/a

Conventional indirect X‐ray detectors employ scintillating phosphors to convert X‐ray photons into photodiode‐detectable visible photons, leading to low conversion efficiencies, low spatial resolutions, and optical crosstalk. Consequently, X‐ray detectors that directly convert photons into electric signals have long been desired for high‐performance medical imaging and industrial inspection. Although...

article

Self‐Assembled Molecule Doping Enables High‐Efficiency Hole‐Transport‐Layer‐Free Perovskite Light‐Emitting Diodes

Lingfeng Zhou, Minxing Yan, Guangjie Luo, Li Xu, more

Advanced Functional Materials > 33 > 36 > n/a - n/a

Hole‐transport‐layer‐free (HTL‐free) perovskite light‐emitting diodes (PeLEDs) are attracting increasing research attention because of their simplified device structure, fast preparation process, and high cost effectiveness. However, their much lower external quantum efficiency (EQE) as compared with the conventional p‐i‐n type ones has considerably limited their application prospects. Here, a self‐assembled...

article

Photo‐Stimuli‐Responsive Dual‐Emitting Luminescence of a Spiropyran‐Encapsulating Metal–Organic Framework for Dynamic Information Encryption

He‐Qi Zheng, Yu Yang, Zhiyu Wang, Deren Yang, more

Advanced Materials > 35 > 26 > n/a - n/a

The development of photo‐stimuli‐responsive luminescent materials is essential to address emerging demands in encryption security. Here, a novel photo‐stimuli‐responsive dual‐emitting luminescent material ZJU‐128⊃SP (SP = spiropyran) is reported, which is obtained by encapsulating spiropyran molecules into a cadmium‐based metal–organic framework (MOF), [Cd₃(TCPP)₂]·4DMF·4H₂O (ZJU‐128, H₄TCPP = 2,3,5,6‐tetrakis...

article

High‐Performance and Self‐Powered X‐Ray Detectors Made of Smooth Perovskite Microcrystalline Films with 100 μm Grains

Ning Li, Yuyang Li, Shengdan Xie, Jinming Wu, more

Angewandte Chemie International Edition > 62 > 19 > n/a - n/a

Perovskite single crystals and polycrystalline films have complementary merits and deficiencies in X‐ray detection and imaging. Herein, we report preparation of dense and smooth perovskite microcrystalline films with both merits of single crystals and polycrystalline films through polycrystal‐induced growth and hot‐pressing treatment (HPT). Utilizing polycrystalline films as seeds, multi‐inch‐sized...

article

High‐Performance and Self‐Powered X‐Ray Detectors Made of Smooth Perovskite Microcrystalline Films with 100 μm Grains

Ning Li, Yuyang Li, Shengdan Xie, Jinming Wu, more

Angewandte Chemie > 135 > 19 > n/a - n/a

article

Highly Efficient and Stable Wide‐Bandgap Perovskite Solar Cells via Strain Management

Pengjie Hang, Chenxia Kan, Biao Li, Yuxin Yao, more

Advanced Functional Materials > 33 > 11 > n/a - n/a

Wide‐bandgap (WBG) perovskite solar cells (PSCs) with high performance and stability are in considerable demand to boost tandem solar cell efficiencies. Perovskite bandgap broadening results in a high barrier for enhancing the efficiency of PSCs and phase segregation in perovskite. In this study, it is shown that the residual strain is the key factor affecting the WBG perovskite device efficiency...

article

Arsenic Precipitation in Heavily Arsenic‐Doped Czochralski Silicon

Defan Wu, Tong Zhao, Bin Ye, Xingbo Liang, more

physica status solidi (RRL) – Rapid Research Letters > 17 > 3 > n/a - n/a

Heavily arsenic‐doped Czochralski (HAs‐CZ) silicon is an important substrate material for manufacturing power electronic devices. The arsenic impurities may be in a supersaturated status in a certain temperature range during the HAs‐CZ silicon crystal growth or the device fabrication. Then, whether and how the arsenic impurities can precipitate in HAs‐CZ silicon is an intriguing and practically significant...

article

An Array of Light‐Stimulated Two‐Terminal Synaptic Devices with the Modulation of Electric Polarity

Xiao Liu, Shijie Huang, Kun Wang, Yue Wang, more

Advanced Functional Materials > 33 > 9 > n/a - n/a

Neuromorphic visual systems based on optoelectronic synaptic devices have been recently studied to simulate the retina and visual cortex of a human being. Now it is shown that an array of optoelectronic synaptic devices based on the two‐terminal structure of Si/perovskite/Au may mimic the functionalities of lateral geniculate nucleus (LGN) cells. Benefiting from the photovoltaic effect, the devices...

article

Improved Surface Passivation of Rear SiN_x/AlO_x Stacks in p‐Type Boron‐Doped Czochralski Silicon Wafers During Dark Annealing at Elevated Temperatures

Zechen Hu, Dehang Lin, Tong Zhao, Pengjie Hang, more

physica status solidi (a) > 219 > 22 > n/a - n/a

Herein, the surface passivation quality of p‐type boron‐doped Czochralski silicon (Cz‐Si) wafers with passivated emitter and rear cell (PERC) structure during 200 °C dark annealing is investigated. During such a treatment, a reduction in the saturation current density (J ₀) along with the degradation and regeneration of minority carrier lifetime can only be observed in PERC‐structured wafers that...

article

Vacuum‐Vapor‐Deposited 0D/3D All‐Inorganic Perovskite Composite Films toward Low‐Threshold Amplified Spontaneous Emission and Lasing

Hongjun Tian, Xinyi Jiang, Tianjing Li, Minxing Yan, more

Small > 18 > 45 > n/a - n/a

Vacuum vapor deposition (VVD) is a promising way to advancing the commercialization of perovskite light sources owing to its convenience for wafer‐scale mass production and compatibility with silicon photonics manufacturing infrastructure. However, the light emission performance of VVD‐grown perovskites still lags far behind that of the conventional solution‐processed counterparts due to their inferior...

article

Phase‐Stable Wide‐Bandgap Perovskites for Four‐Terminal Perovskite/Silicon Tandem Solar Cells with Over 30% Efficiency (Small 38/2022)

Yuxin Yao, Pengjie Hang, Biao Li, Zechen Hu, more

Small > 18 > 38 > n/a - n/a

Tandem Solar Cells Light‐induced phase segregation is the chief culprit for the open‐circuit voltage deficit and photo‐instability in mix‐halide perovskite solar cells with wide‐bandgap. In article number 2203319, Xuegong Yu and co‐workers report a highly efficient and photo‐stable wide‐bandgap perovskite solar cell with a top‐ranking open‐circuit voltage of 1.24 V realized by defects management in...

article

Phase‐Stable Wide‐Bandgap Perovskites for Four‐Terminal Perovskite/Silicon Tandem Solar Cells with Over 30% Efficiency

Yuxin Yao, Pengjie Hang, Biao Li, Zechen Hu, more

Small > 18 > 38 > n/a - n/a

Wide‐bandgap perovskite solar cells (PSCs) with an optimal bandgap between 1.7 and 1.8 eV are critical to realize highly efficient and cost‐competitive silicon tandem solar cells (TSCs). However, such wide‐bandgap PSCs easily suffer from phase segregation, leading to performance degradation under operation. Here, it is evident that ammonium diethyldithiocarbamate (ADDC) can reduce the detrimental...

article

Hyperdoped Crystalline Silicon for Infrared Photodetectors by Pulsed Laser Melting: A Review

Jiawei Fu, Deren Yang, Xuegong Yu

physica status solidi (a) > 219 > 14 > n/a - n/a

Infrared photodetectors based on crystalline silicon have attracted much attention due to their low cost and good compatibility with complementary metal–oxide–semiconductor (CMOS) technology in ultra‐largescale integrated circuits (ULSI). However, silicon shows no response to infrared light with a wavelength of over 1100 nm corresponding to its bandgap of 1.12 eV. Pulsed laser melting and rapid solidification...

article

Effect of Germanium Codoping on the Grown‐In Oxide Precipitates in Nitrogen‐Doped Czochralski Silicon

Wu Lan, Tong Zhao, Defan Wu, Deren Yang, more

physica status solidi (a) > 219 > 5 > n/a - n/a

The effects of germanium (Ge)‐codoping at 10¹⁸, 10¹⁹, or 10²⁰cm⁻³ level on the grown‐in oxide precipitates in 10¹⁴cm⁻³ level nitrogen (N)‐doped Czochralski (NCZ) silicon have been investigated. It is found that Ge‐codoping enhances the formation of relatively larger grown‐in oxide precipitates. However, such enhancement effect weakens with the increasing Ge‐codoping concentration. On this basis,...

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INFONA - science communication portal

Search results for: Deren Yang

HCOO⁻ Doping‐Induced Multiexciton Emissions in Cs₃Cu₂I₅ Crystals for Efficient X‐Ray Scintillation

Electroluminescence from Silicon‐Based Light‐Emitting Devices with Erbium‐Doped Ta₂O₅ Films

Numerical Simulation of the Transport of Gas Species in the PVT Growth of Single‐Crystal SiC

Dielectric Regulation for Efficient Top‐Emission Perovskite Light‐Emitting Diodes with Suppressed Efficiency Roll‐off

Young's Modulus Characterization of Nano‐Level Silicon Nanomembrane

The Mechanism Behind the Annealing‐Induced Reduction of Infrared Absorption in Zinc‐Hyperdoped Silicon

Lattice‐Gradient Perovskite KTaO₃ Films for an Ultrastable and Low‐Dose X‐Ray Detector

Self‐Assembled Molecule Doping Enables High‐Efficiency Hole‐Transport‐Layer‐Free Perovskite Light‐Emitting Diodes

Photo‐Stimuli‐Responsive Dual‐Emitting Luminescence of a Spiropyran‐Encapsulating Metal–Organic Framework for Dynamic Information Encryption

High‐Performance and Self‐Powered X‐Ray Detectors Made of Smooth Perovskite Microcrystalline Films with 100 μm Grains

High‐Performance and Self‐Powered X‐Ray Detectors Made of Smooth Perovskite Microcrystalline Films with 100 μm Grains

Highly Efficient and Stable Wide‐Bandgap Perovskite Solar Cells via Strain Management

Arsenic Precipitation in Heavily Arsenic‐Doped Czochralski Silicon

An Array of Light‐Stimulated Two‐Terminal Synaptic Devices with the Modulation of Electric Polarity

Improved Surface Passivation of Rear SiN_x/AlO_x Stacks in p‐Type Boron‐Doped Czochralski Silicon Wafers During Dark Annealing at Elevated Temperatures

Vacuum‐Vapor‐Deposited 0D/3D All‐Inorganic Perovskite Composite Films toward Low‐Threshold Amplified Spontaneous Emission and Lasing

Phase‐Stable Wide‐Bandgap Perovskites for Four‐Terminal Perovskite/Silicon Tandem Solar Cells with Over 30% Efficiency (Small 38/2022)

Phase‐Stable Wide‐Bandgap Perovskites for Four‐Terminal Perovskite/Silicon Tandem Solar Cells with Over 30% Efficiency

Hyperdoped Crystalline Silicon for Infrared Photodetectors by Pulsed Laser Melting: A Review

Effect of Germanium Codoping on the Grown‐In Oxide Precipitates in Nitrogen‐Doped Czochralski Silicon

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