Nature Communications
·
2021
·Vol. 12
·期 1
·1-6
·
IF 14.919
Li Jidong,Long Yuyang,Hu Zhili,Niu Jiyuan,Xu Tiezhu,Yu Maolin,Li Baowen,Li Xuemei,Zhou Jianxin,Liu Yanpeng,Wang Cheng,Shen Laifa,Guo Wanlin,Yin Jun
External photo-stimuli on heterojunctions commonly induce an electric potential gradient across the interface therein, such as photovoltaic effect, giving rise to various present-day technical devices. In contrast, in-plane potential gradient along the interface has been rarely observed. Here we show that scanning a light beam can induce a persistent in-plane photoelectric voltage along, instead of across, silicon-water interfaces. It is attributed to the following movement of a charge packet in the vicinity of the silicon surface, whose formation is driven by the light-induced potential change across the capacitive interface and a high permittivity of water with large polarity. Other polar liquids and hydrogel on silicon also allow the generation of the in-plane photovoltage, which is, however, negligible for nonpolar liquids. Based on the finding, a portable silicon-hydrogel array has been constructed for detecting the shadow path of a moving Cubaris. Our study opens a window for silicon-based photoelectronics through introducing semiconductor-water interfaces.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Zhaoyu Wang,Mingyu Li,Xin Chen,Kaihao Zhao,Jiamei Gu,Jian-Jun He,Qiu-Shun Li,Wen-Fei Dong
Silicon-based optical biosensors have garnered significant interest since their inception. They are, however, susceptible to temperature fluctuations in a controlled environment. In order to address this issue, we provide a solution including the utilization of a silicon-on-insulator (SOI) cascaded micro-ring resonators (CMRR) biosensor that is designed to be insensitive to temperature changes. It consists of two ring resonators exposed to the reference solution and analyte, respectively, their radius and waveguide width are designed to meet the temperature - insensitivity criterion of the CMRR sensor. The results of experiments indicate that by real-time monitoring of the envelope peak drift in the transmission spectrum of the sensor, the bulk refractive index (RI) sensitivity is 2940.71 nm/RIU, the limit of detection (LOD) is 3.1×10 −5 RIU, and the temperature sensitivity is less than 40 pm/℃. Furthermore, the sensor was applied for HSA detection, with a calculated LOD of 18.09 ng/mL. The effect of temperature on HSA detection is much smaller than that of a CMRR sensor without athermal design. The sensor demonstrates high sensitivity and temperature insensitivity, and the absence of negative thermo-optic coefficient materials or supplementary temperature control mechanisms simplifies its practical applications. It can be made by a large array to detect different type protein molecules for high throughput multiparameter analysis.
研究领域:
生物医学工程
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光学传感
·
分子检测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Xuran Sun,Chang Liu,Peili Zhang,Lunlun Gong,Mei Wang
To assemble efficient photoelectrochemical (PEC) cells for total water splitting, the inexpensive photocathodes that are active and stable in alkaline solutions are strongly desired, as the known earth abundant catalyst-decorated photoanodes display high activity and good stability for water oxidation mostly in basic media. Herein, we report a Si-based composite photocathode with its front surface coated orderly by an N-doped graphene nanolayer (C N ) and a TiO 2 nanorod array (TiO 2(ALD/NR) ), which is loaded with Ni/Co phosphide catalyst (NiCoP) nanoparticles . The optimized Si/C N /TiO 2(ALD/NR) /NiCoP electrode exhibits a photocurrent density of −19.87 mA cm −2 at 0 V, an onset potential at 0.42 V vs RHE , and an applied bias photon-to-current efficiency of 1.28% for H 2 production in 1.0 M KOH under simulated 1 sun illumination . The impacts of TiO 2 NR array outlayer and surface-loaded NiCoP catalyst on interfacial energetics , charge transfer kinetics, and PEC performance of photocathodes are comparatively studied by using a series of reference electrodes. The results indicate that the TiO 2 NR array makes a major contribution to the evidently improved PEC activity of Si/C N /TiO 2(ALD/NR) , and that the NiCoP loaded on the surface of TiO 2 NR array greatly enhances the charge transfer efficiency and boosts HER kinetics of the photocathode.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2018
·Vol. 6
·期 3
·1801663
·
IF 4.834
Wentian Huang,Qingwei Zhou,Shaoqiang Su,Jing Li,Xubin Lu,Xingsen Gao,Xin Wang,Mingliang Jin,Guofu Zhou,Zhang Zhang,Junming Liu
Loading 2D layered transition metal dichalcogenides (TMDs) on p-type silicon photocathode is suitable for hydrogen production in solar-driven photoelectrochemical (PEC) water splitting. Similarly, various nanostructured TMDs exposing more active sites are widely explored for improving the PEC performances of composite photoelectrodes. Here, defect engineering using a controllable argon ion beam bombardment is presented on ReS 2 /Si photocathode. The atomic vacancy defects are introduced on the 2D ReS 2 to realize high-density active sites, which significantly enhance the solar-driven hydrogen evolution reaction performance of ReS 2 /Si photocathode. The highest photocurrent density of 18.5 mA cm −2 (at 0 V vs reversible hydrogen electrode) is achieved, under a simulated sun irradiation.
研究领域:
材料科学
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光催化
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能源化学
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半导体器件
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纳米科技
✓ 已验证
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2025
·
IF 4.5
Jijie Zhao,Huan Liu,Lier Deng,Weiguo Liu,Bin Sun,Bin Liu,Xiangqian Wang,Xiaoping Gao
Lead sulfide (PbS) colloidal quantum dots (CQDs) are widely used due to their tunable bandgap and high compatibility in composite integration with silicon, expanding the spectral response range of silicon-based photodetectors from visible light to short-wave infrared. The silicon dangling bonds were effectively passivated through CH3I, and the band alignment at the heterojunction interface was adjusted. It reduces electron recombination at the interface, thereby achieving a broad spectral response of silicon-based PbS CQDs heterojunction photodetectors spanning from 380 nm to 1600 nm. As per the research findings, Si:PbS CQDs photodetectors passivated with CH3I showcase impressive characteristics with a rectification ratio of 1.2× 102 and a high on-off ratio of 3.1× 103. These characteristics underscore a remarkable photovoltaic effect within the detectors. The detector achieves an average external quantum efficiency of 37% in the visible and short wave infrared spectrum. At 1470 nm, the responsivity of the Si:PbS CQDs photodetector reaches 0.22 A/W, with a detectivity of 3.3×1011 Jones, marking a 28-fold increase compared to the Si:PbS CQDs photodetector without CH3I passivation. This work offers a new strategy for manufacturing low-cost, high-performance PbS CQDs photodetectors compatible with silicon arrays.
研究领域:
光电子学
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纳米技术
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半导体物理
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材料科学
·
红外探测
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）