ACS Photonics
·
2026
·
IF 6
Hang Xia,Luyao Lv,Xi Ran,Mohan Yuan,Xinzheng Lan
PbS colloidal quantum dots (CQDs) hold great promise in the next generation of low-cost, high-performance short-wave infrared (SWIR) photodetectors. Both the dark current and the spectral response, however, have been hampered by the preparation of semiconductor-grade PbS CQDs. Here, we report high-performance PbS CQD photodetectors by leveraging a monomer-assisted ligand exchange strategy. The resultant PbS CQD films show enhanced defect passivation evidenced by more than 1 order of magnitude increase in their exciton lifetime, which translated into photodetectors with record low dark current and high specific detectivity (D*). For a cutoff wavelength ∼1700 nm, ultralow dark current (21 nA/cm2 at −0.5 V) and a peak specific detectivity (D*) of 8.73 × 1012 Jones were achieved at 1650 nm, which are comparable to commercial InGaAs photodetectors. In addition, the implementation of this approach to large-sized PbS CQDs leads to broadband photodetectors with a cutoff wavelength of ∼2330 nm, a regime previously inaccessible to PbS CQDs. The monolithic integration of PbS CQD photodetectors with a 256 × 256 pixel thin-film transistor readout circuit enables infrared imaging through Si and Ge filters, validating the technology’s potential for broadband imaging applications.
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高影响因子
Nano Research
·
2024
·Vol. 17
·期 12
·10302-10308
·
IF 9.5
Rahman Sami Ur,Song Yong-Hui,Ma Zhen-Yu,Tai Xiao-Lin,Zhu Bai-Sheng,Yin Yi-Chen,Feng Li-Zhe,Hao Jing-Ming,Ding Guan-Jie,Song Kuang-Hui,Hu Ya-Lan,Li Tieqiang,Xu Jixian,Yao Hong-Bin
Lead sulfide quantum dots (PbS QDs) are promising candidates for high-performance solar cells due to their tunable bandgaps and low-cost solution processing. However, low carrier mobility and numerous surface defects restrict the performance of the fabricated solar cells. Herein, we report the synthesis of novel PbS-perovskite core-shell QDs to solve the low carrier mobility problem of PbS QDs via a facile hot injection method. CsPbI 2 Br shell enabled strain-free epitaxial growth on the surface of PbS QDs because of 98% lattice match. Our results demonstrate a significant improvement in the photoluminescence and stability of the synthesized PbS-CsPbI 2 Br QDs upon shell formation, attributed to the effective suppression of surface defects by the epitaxial shell of CsPbI 2 Br. As a result, the obtained solar cell based on PbS-CsPbI 2 Br core-shell QD exhibits a power conversion efficiency (PCE) of 8.43%, two times higher than that of pristine PbS QDs. Overall, the construction of PbS-CsPbI 2 Br core-shell structures represent a promising strategy for advancing the performance of PbS QDs-based optoelectronic devices.
研究领域:
材料科学
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太阳能电池技术
·
纳米科技
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Ya Wang,Huicheng Hu,Mohan Yuan,Hang Xia,Xingchen Zhang,Jing Liu,Ji Yang,Shaoqiu Xu,Zhaorong Shi,Jungang He,Jianbing Zhang,Liang Gao,Jiang Tang,Xinzheng Lan
Lead sulfide (PbS) colloidal quantum dots (CQDs) for photodetectors (PDs) have garnered great attention due to their potential use as low-cost, high-performance, and large-area infrared focal plane arrays. The prevailing device architecture employed for PbS CQD PDs is the p–i–n structure, where PbS CQD films treated with thiol molecules, such as 1,2-ethanedithiol (EDT), are widely used as p-type layers due to their favorable band alignment. However, PbS-EDT films face a critical challenge associated with low film quality, resulting in many defects that curtail the device performance. Herein, a controlled oxidization process is developed for better surface passivation of the PbS-EDT transport layer. The dark current density (Jd) of PbS CQD PDs based on optimized PbS-EDT layer shows a dramatic decrease by nearly 2 orders of magnitude. The increase of carrier lifetime and suppression of carrier recombination via controlled oxidation in PbS-EDT CQDs were confirmed by transient absorption spectra and electrochemical impedance spectra. The device based on the optimized PbS-EDT hole transport layer (HTL) exhibits a specific detectivity (D*) that is 3.4 times higher compared to the control device. Finally, the CQD PD employing oxidization PbS-EDT CQDs is integrated with a thin film transistor (TFT) readout circuit, which successfully accomplishes material discrimination imaging, material occlusion imaging, and smoke penetration imaging. The controlled oxidization strategy verifies the significance of surface management of CQD solids and is expected to help advance infrared optoelectronic applications based on CQDs.
研究领域:
材料科学
·
光电子学
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jiajia Wang,Li Li,Ruyi Wei,Renfeng Dong
Here, we report the first PbS quantum dot (QD)-based micromotors with NIR-I light-driven photocatalytic propulsion and NIR-II fluorescence. Under the irradiation of NIR-I light (808 nm), PbS QD-doped cuprous oxide (Cu2O@PbS) micromotors can display efficient propulsion in a variety of biocompatible fuels such as malic acid, glucose, and urea. Among them, the Cu2O@PbS micromotors exhibit the best propulsion performance in a very low concentration of malic acid, with an average speed as high as 11.86 μm/s. The enhanced NIR-I photocatalytic activity of Cu2O@PbS micromotors benefits from the doping of NIR-I PbS QDs that can be excited by NIR-I light and exhibit high electron transport efficiency. The doped PbS QDs can effectively increase the absorption efficiency of the micromotors in the NIR-I region while also inhibiting the recombination of photogenerated electron–hole pairs. Interestingly, due to the presence of NIR PbS QDs, the Cu2O@PbS micromotors demonstrate prominent and stable NIR-II fluorescence (emission wavelength: 1100 nm), which offer promising potential for visualization of their position in vivo. In comparison to other photocatalytic micromotors, the simple fabrication strategy, excellent NIR-II fluorescence, together with the NIR-I light-dependent propulsion behavior of the current Cu2O@PbS micromotors, thus pave the way for further development of advanced smart “robots” for intelligent biomedical applications.
研究领域:
纳米技术
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生物医学工程
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材料科学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 14
·19380-19389
·
IF 2.478
Zhao Yingying,Zhang Jiejing,Fu Wuyou
Organic pollutant is an environmentally harmful and ubiquitous aquatic pollutant with extensive production and application. In this study, a unique novel TiO 2 -based dual-sensitized heterojunction photocatalyst (PbS/CdS/TiO 2 ) was successfully obtained by one step hydrothermal method, chemical bath deposition (CBD) method and ionic layer adsorption and reaction (SILAR) method. Scanning electron microscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and energy dispersive spectrometer characterized the composition. PbS/CdS was successfully decorated on the surface of TiO 2 nanosheet array. As a stable catalyst with wide-spectrum (300–800 nm) optical response, excited electron–hole pairs of PbS/CdS/TiO 2 could apply in degrading organic pollutants. Successfully, the degradation efficiency of PbS(5 C)/CdS(30 min)/TiO 2 nanocomposites reached 99.9% under visible light, which was 5 times over pure TiO 2 . This ternary heterostructured materials will be well-promising photocatalysts.
研究领域:
环境科学
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材料科学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Ming Li,Xiaoqin Yuan,Haoran Ruan,Xiandong Wang,Yongping Liu,Zhenhuan Lu,Jiefeng Hai
A new method for synthesizing freestanding PbS-CH 3 NH 3 PbI 3 (MAPI) core-shell nanoparticles (NPs) with enhanced light absorption and photoelectric properties was reported. The transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS) analysis confirmed the core-shell structure of the obtained sample. The Vis-NIR spectra proved the core-shell sample absorbed light both in visible and near infrared region . For comparison, oleic acid/oleylamine molecule capping PbS NPs, MAPI molecule capping PbS NPs, and PbS-MAPI core-shell NPs were used to fabricate Schottky solar cells. PbS-MAPI core-shell NPs based solar cells delivered a photocurrent response from both the PbS and MAPI, and achieved the highest overall PCE.
研究领域:
材料科学
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纳米科技
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光电子学
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能源材料
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半导体物理
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DOI
高影响因子
Journal of Physical Chemistry Letters
·
2024
·
IF 4.8
Jiasong Lin,Zhen Wang,Qinghong Lin,Jiayu Sun,Xuan Guo,Yue Wang,Liangxu Lin,Yi Zhao,Yang Liu,Deli Li,Fushan Li
The rise of big data and the internet of things has driven the demand for multimodal sensing and high-efficiency low-latency processing. Inspired by the human sensory system, we present a multifunctional optoelectronic-memristor-based reservoir computing (OM-RC) system by utilizing a CuSCN/PbS quantum dots (QDs) heterojunction. The OM-RC system exhibits volatile and nonlinear responses to electrical signals and wide-spectrum optical stimuli covering ultraviolet, visible, and near-infrared (NIR) regions, enabling multitask processing of dynamic signals. The OM-RC system accurately performs health monitoring through dynamic electroencephalogram and electrocardiogram signal analysis and achieves object and traffic trajectory recognition for intelligent driving under challenging conditions like foggy environments. By collaboratively using the NIR perception and trajectory recognition, we develop a human–computer interaction authentication system that integrates finger veins and motion behaviors of humans, significantly enhancing the security of traditional fingerprint anticounterfeiting systems. This work demonstrates the potential of QD-based optoelectronic-memristor for multitask in-sensor processing applications.
研究领域:
光电子学
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纳米技术
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人工智能
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神经形态计算
·
量子点
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信号处理
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人机交互
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传感器
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生物医学工程
·
智能系统
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高影响因子
Device
·
2026
·
IF 8.7
Yi Ji,Tianhao Zhao,Yuxuan Liu,Zhiyuan Du,John G. Labram,Can Li,Tianshuo Zhao
Retinomorphic sensors imitate retinal processing by responding to changes in light intensity while suppressing steady photocurrent, enabling event-based imaging with reduced data volume. However, the material and architecture design of existing devices limit detectivity in the shortwave infrared (SWIR). The device integration with readout integrated circuits (ROICs) is still lacking. Here, we present zero-bias SWIR retinomorphic sensors based on solution-processed PbS quantum dot and ZnO nanoparticle layers stacked with SiO 2 or high-κ HfO 2 to form photosensitive capacitors (PCs). Light onset and offset charge and discharge the capacitor, producing transient spikes via a built-in potential that separates photocarriers. We correlate spike characteristics with carrier type, device architecture, and illumination. Integrated with a silicon ROIC array, these sensors realize SWIR event-driven imaging of moving objects with static-background suppression, achieving ∼30 Hz operation and ∼80% data reduction versus cameras using photodiodes. This work advances PC device architecture designs, elucidates their mechanisms, and achieves large-area retinomorphic imagers.
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高影响因子
Nanomaterials
·
2026
·Vol. 16
·期 6
·363
·
IF 4.8
Yuanze Hong,Zhipeng Wei,Xiaohua Wang
Developing reliable processing routes for semiconductor thin films is essential for advancing photodetection technologies. The amine-thiol solvent system, in comparison with other liquid-phase synthesis methods, does not necessitate stepwise ion-exchange reactions. It is capable of obtaining the target semiconductor thin film by directly dissolving bulk powder followed by subsequent annealing. Although PbO can be dissolved in this solvent as a raw material to obtain PbS thin films, the structural evolution, optical properties, and photodetection performance of the films obtained via this solvent system still require further exploration. This solvent system was employed to prepare PbS thin films, and a comprehensive investigation was carried out on the evolution of their structure, morphology, and optical properties during preheating and annealing treatments. During preheating, the films exhibit directional ordering within the organic matrix, which converts into phase-pure PbS upon annealing. Based on the optimized films, interdigitated photodetectors and hybrid devices integrated with graphene transistors are fabricated. The resulting devices exhibit strong photoresponse and operational stability, demonstrating the viability of amine-thiol-processed PbS films for photodetection applications.
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高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Ming Jing,Yanhong Ji,Liuchun Zheng,Xi Liu,Zunbo Han,Jiayi Cai,Rui Bai,Benqiao He
Biodegradable membrane materials can be degraded into small molecules under natural conditions, which can effectively alleviate the environmental pollution caused by the waste of traditional organic membrane materials. In this work, biodegradable poly (butylene succinate) (PBS)/nano-CaCO 3 hybrid membranes has been prepared via non-solvent induced phase separation method by blending environmentally friendly nano-CaCO 3 particles with PBS. The incorporation of nano-CaCO 3 particles into the membrane leads to a notable enhancement in mechanical strength , from 1.03±0.05 MPa to 1.42±0.13 MPa, resulting in a substantial increase of approximately 37 %. Additionally, the introduction of these particles also contributes to a reduction in contact angle, from 63° to 56°. Consequently, the issue of inadequate mechanical strength and limited hydrophilicity of PBS membrane is effectively addressed. Moreover, the pure water permeance of membrane increases from 8.5 L·m −2 ·h −1 ·bar −1 to 89.3 L·m −2 ·h −1 ·bar −1 , and the permeability is greatly improved. The permeance recovery rate of the membrane increases from 78 % to 95 %, and the anti-fouling performance is improved. In addition, PBS can be degraded after the service of PBS/nano-CaCO 3 hybrid membrane, and CaCO 3 particles are environmentally friendly. Therefore, the PBS/nano-CaCO 3 hybrid membrane hybrid membrane prepared in this study is a green and environmentally friendly membrane material.
研究领域:
材料科学
·
环境科学
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高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Sisi Liu,Chengjie Deng,Meng Wang,Aoshen Wei,Tianyu Luo,Haifei Lu,Xiaoyan Wen,Ming-Yu Li,Jianbing Zhang
PbS quantum dot (QD) infrared (IR) solar cells that can absorb low-energy photons are promising photovoltaic devices to improve utilization of sunlight energy by broadening absorption range of the sunlight spectrum to short-wave infrared region. For PbS QD photovoltaics, depleted heterojunction established between photoactive layer and ZnO electron transport layer (ETL) is critical to determine the performance of devices. However, undesired defects in ZnO films and mismatched energy levels have limited the improvement of device properties. Herein, a novel and simple gradient ZnO ETL is developed for achieving high-performance QD IR solar cells by depositing a Cs-doped ZnO thin layer on the pristine ZnO film. The resulting gradient ETL exhibits significantly suppressive trap states and a much smoother surface, efficiently reducing the trap-assisted nonradiative recombination at the interfaces. Meanwhile, realigned energy levels of the gradient ZnO ETL facilitate the transport and extraction of photogenerated carriers. As a result, the champion device shows a high IR open circuit voltage ( V OC ) of 0.446 V and IR power conversion efficiency (PCE) of 1.27% under 1100 nm filtered illumination. The V OC and PCE are 0.507 V and 11.04% under AM1.5 illumination, respectively. These results demonstrate a promising strategy for exploiting high-performance infrared optoelectronic devices.
研究领域:
材料科学
·
光电子学
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DOI
高影响因子
Frontiers of Optoelectronics
·
2024
·Vol. 17
·期 1
·1-7
·
IF 4.1
Li Zha,Li Wancai,Li Dehui,Tang Wei,Liang Huageng,Song Huaibing,Chen Chao,Gao Liang,Tang Jiang
Chiral inorganic semiconductors with high dissymmetric factor are highly desirable, but it is generally difficult to induce chiral structure in inorganic semiconductors because of their structure rigidity and symmetry. In this study, we introduced chiral ZnO film as hard template to transfer chirality to CsPbBr 3 film and PbS quantum dots (QDs) for circularly polarized light (CPL) emission and detection, respectively. The prepared CsPbBr 3 /ZnO thin film exhibited CPL emission at 520 nm and the PbS QDs/ZnO film realized CPL detection at 780 nm, featuring high dissymmetric factor up to around 0.4. The electron transition based mechanism is responsible for chirality transfer. Graphical Abstract
研究领域:
材料科学
·
光学
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PubMed
高影响因子
危险品化学品经营许可证（带存储）