ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 38
·2304140
·
IF 19
Xuanling Liu,Ziyi Wu,Han Zhong,Xuanyu Wang,Jianfei Yang,Ziling Zhang,Jianhua Han,Dan Oron,Hong Lin
Nanomaterials such as quantum dots and 2D materials have been widely used to improve the performance of perovskite solar cells due to their favorable optical properties, conductivity, and stability. Nevertheless, the interfacial crystal structures between perovskites and nanomaterials have always been ignored while large mismatches can result in a significant number of defects within solar cells. In this work, cubic PbS nanosheets with (200) preferred crystal planes are synthesized through anisotropy growth. Based on the similar crystal structure between cubic PbS (200) and cubic-phase formamidinium lead triiodide ( α -FAPbI 3 ) (200), a nanoepitaxial PbS nanosheets-FAPbI 3 heterostructure with low defect density is observed. Attribute to the epitaxial growth, PbS nanosheets-FAPbI 3 hybrid polycrystalline films show decreased defects and better crystallization. Optimized perovskite solar cells perform both improved efficiency and stability, retaining 90% of initial photovoltaic conversion efficiency after being stored at 20 °C and 20% RH for 2500 h. Notably, the significantly improved stability is ascribed to the interfacial compression strain and chemical bonding between (200) planes of PbS nanosheets and α -FAPbI 3 (200). This study provides insight into high-performance perovskite solar cells achieved by manipulating nanomaterial surfaces.
研究领域:
材料科学
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纳米技术
·
能源科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 2
·505-512
·
IF 3.069
Xiaoli Mao,Jianguo Yu,Jun Xu,Juntian Zhou,Cheng Luo,Lang Wang,Haihong Niu,Jinzhang Xu,Ru Zhou
All solid-state quantum dot-sensitized solar cells (QDSCs) have become increasingly attractive owing to their ability to solve the issues of package difficulty and poor long-term stability. However, the commonly used colloidal lead sulfide (PbS) quantum dots (QDs) suffer from having a complicated synthesis with the use of high-temperature, harmful organic solvents and a protective atmosphere. In this work, the synchronous deposition of PbS and CdS QDs, realized through a facile successive ionic layer adsorption and reaction (SILAR), was proposed to construct efficient and stable solid-state QDSCs. This design concept affords two benefits: (1) the synchronous deposition of two sulfides suppresses the excessive growth of PbS QDs in the mesopores of films, thereby ensuring the efficient electron injection from PbS to TiO2; (2) the intimate interpenetration of two sulfides allows superior passivation of high-density defects on the surface of PbS QDs, which reduces the severe interfacial charge recombination. As a result, the solid-state (Pb,Cd)S QD-sensitized TiO2 solar cell achieved more than 5 times efficiency enhancement in contrast to the conventional PbS/CdS pattern based device. This work highlights the design of novel QD schemes for high performance solid-state solar cells.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Panpan Wang,Ling Cao,Yu Chen,Ying Wu,Junwei Di
A novel kind of hydrogen peroxide (H2O2) photoelectrochemical (PEC) sensor was constructed based on Co3O4 and PbS nanomaterial modified indium tin oxide (ITO) photoelectrode. The Co3O4 nanoparticles, as mimic enzyme of catalase (CAT), can catalyze H2O2 to generate oxygen (O2) in suit. Then the electron acceptor of O2 enhances the cathodic photocurrent of the photoelectrode. The PEC sensor exhibited high sensitivity because of the formation of p–p type heterostructure between PbS and Co3O4 semiconductors. The photocurrent enhancement can be used to detect concentration of H2O2. The calibration plot was linear in the range from 5 to 250 μM, and the detection limit was estimated to be 1.2 μM. The results demonstrated the possibility of nanozyme application in PEC biosensors and the substitution of Co3O4 nanozyme for the natural enzyme.
研究领域:
生物传感技术
·
纳米材料科学
·
分析化学
✓ 已验证
产品关联
DOI
ACS Applied Nano Materials
·
2024
·
IF 5.3
Haixia Xie,Cong Zhang,Jie Xu,Yong Pan,Xingtian Yin
PbS quantum dots have demonstrated potential as cost-effective materials for near-infrared photodetectors. Nevertheless, the performance of single-layer PbS quantum dot photodetectors remains unsatisfactory due to the low carrier mobility and high defect state concentration of colloidal quantum dot thin films. In this article, PbS quantum dot films are employed as the sensitizing layers for a-IGZO-based field-effect transistors (FET), which are able to achieve a low dark current and relatively high photocurrent simultaneously when working in the Poole–Frenkel emission region. The as prepared device shows a high responsivity of 25.89 A/W and detectivity of 2.46 × 1012 Jones, but very slow response speed with a decay time of 554 ms, which should be attributed to the high trap density in the PbS quantum dots film. Thus, we proposed a rapid annealing oxidation process to passivate the defects. As a result, after annealing in air at 100 °C for 10 min, the response speed of the device is significantly improved, and the decay time is as short as 2.5 ms, only at the expense of some responsivity and selectivity loss. However, further increasing the annealing temperature leads to excessive photocurrent loss and even affects the response speed improvement.
研究领域:
材料科学
·
电子工程
·
光电器件
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Wenjie Zhang,Fan Fang,Huaying Zhong,Lili Huang,Haodong Tang,Xi Chen,Junjie Hao,Lei Zhang,Leifeng Cao,Jun Tang,Keyu Zheng,Peter Müller-Buschbaum,Wei Chen
PbS quantum dots (QDs) are particularly promising in low-cost short-wave infrared (SWIR) photodetection and imaging applications. Herein, a novel method is introduced defined as the perovskite conversion method (PCM) fabricating PbS QDs by using perovskite nanocrystals (PeNCs) as the lead precursor. The elemental substitution mechanism for PbS QDs from PeNCs is proposed, and it is confirmed that PCM-QDs are exhibiting a smaller trap density due to a natural perovskite passivated surface condition compared to QDs prepared via conventional hot injection method (HIM). Grazing-incidence small-angle X-ray scattering (GISAXS) results indicate that a short-range disorder of the QDs can lead to a long-range disorder configuration in the inner structure of PCM-QD superlattice, which leads to a compact configuration in the QD solid film facilitating charge carrier transport in devices. In a photoconductor-typed SWIR photodetector (PD) comparison, PCM-QD PDs exhibit a high responsivity of 468 A W −1 and detectivities of 2.1 × 10 12 Jones, which are almost three times higher than the values in HIM-QDs PDs. Moreover, PCM-QD PDs further show a higher response speed and one magnitude order higher loss frequency than PCM-QD PDs. PCM is promising in the fabrication of high-quality QDs for advanced optoelectronic applications.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Yichuan Wang,Chengjie Deng,Jing Liu,Long Chen,Sen Li,Peiyan Zhang,Tianhao Cui,Yongshun Wang,Boxiang Song,Xing Zhou,Ying Zhou,Jianbing Zhang,Liang Gao,Jiang Tang
PbS colloidal quantum dots (CQDs) offer solution-processability, tunable bandgap, and monolithic integration with complementary metal oxide semiconductor (CMOS) readout circuit, making them highly adaptable for advanced infrared detection. However, optimizing interfacial quality remains critical for achieving high performance of PbS CQDs imager. In particular, the hydrophobicity of the C 60 sacrificial layer disrupts the atomic layer deposition of SnO 2 , leading to poor film uniformity, low density, and increased interfacial defects. To address this, a hydrophilic WO x interlayer atop C 60 is introduced, significantly improving SnO 2 deposition, reducing interfacial defects, and suppressing dark current density to 287 nA/cm 2 at −0.5 V. This strategy also mitigates halide ion migration from halide-passivated CQDs surface to SnO 2 layer, enhancing device stability. Consequently, this CQDs photodiodes achieve a high specific detectivity of 2.47 × 10 12 cm·Hz 1/2 ·W −1 . Furthermore, the monolithically integrated CQDs imager with CMOS readout circuit demonstrates advanced capabilities for material differentiation and penetration imaging.
研究领域:
材料科学
·
电子工程
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Photonics
·
2024
·
IF 32.3
Mu Ge,Tan Yimei,Bi Cheng,Liu Yanfei,Hao Qun,Tang Xin
Photodetection over a broad spectral range is necessary for multispectral sensing and imaging. Despite the fact that broadband single-element detectors with high performance have been demonstrated with various low-dimensional materials, broadband focal plane array imagers have been rarely reported. Here we propose a stacked lead sulfide/mercury telluride colloidal quantum dot photodetector configuration with optimized graded energy gaps. This architecture allows for ultrabroadband spectral response from 0.4 to 5.0 µm, with responsivity values of 0.23, 0.31, 0.83 and 0.71 A W −1 at 0.4, 0.7, 2.2 and 4.2 µm, respectively. We also fabricate a focal plane array imager with a resolution of 640 × 512, a low photoresponse non-uniformity down to 6% and a noise equivalent temperature difference as low as 34 mK. We demonstrate broadband imaging by simultaneously capturing both short-wave infrared and mid-wave infrared information, as well as multispectral imaging in the red, green, blue, short-wave infrared and mid-wave infrared channels, using a set of optical filters.
研究领域:
光电技术
·
材料科学
·
成像技术
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 13
·1996
·
IF 5.3
Mutan Luo,Run Chen,Zhaowei Zhu,Chuantong Cheng,Xin Ning,Beiju Huang
A high-efficiency photodetector consisting of colloidal PbS quantum dots (QDs) and single-layer graphene was prepared in this research. In the early stage, PbS QDs were synthesized and characterized, and the results showed that the product conformed with the characteristics of high-quality PbS QDs. Afterwards, the photodetector was derived through steps, including the photolithography and etching of indium tin oxide (ITO) electrodes and the graphene active region, as well as the spin coating and ligand substitution of the PbS QDs. After application testing, the photodetector, which was prepared in this research, exhibited outstanding properties. Under visible and near-infrared light, the highest responsivities were up to 202 A/W and 183 mA/W, respectively, and the highest detectivities were up to 2.24 × 1011Jones and 2.47 × 108Jones, respectively, with light densities of 0.56 mW/cm2and 1.22 W/cm2, respectively. In addition to these results, the response of the device and the rise and fall times for the on/off illumination cycles showed its superior performance, and the fastest response times were approximately 0.03 s and 1.0 s for the rise and fall times, respectively. All the results illustrated that the photodetector based on PbS and graphene, which was prepared in this research, possesses the potential to be applied in reality.Keywords:PbS quantum dots;graphene;indium tin oxide;photodetector;high responsivity and detectivity
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yiting Yang,Zhengdan Rao,Qien Xu,Yongqi Liang,Lin Yang
Interfaces exist between functional layers inside thin film optoelectronic devices, and it is very important to minimize the energy loss when electrons move across the interfaces to improve the photovoltaic performance. For PbS quantum dots (QDs) solar cells with the classical n-i-p device architecture, it is particularly challenging to tune the electron transfer process due to limited material choices for each functional layer. Here, we introduce materials to tune the electron transfer across the three interfaces inside the PbS-QD solar cell: (1) the interface between the ZnO electron transport layer and the n-type iodide capped PbS QD layer (PbS-I QD layer), (2) the interface between the n-type PbS-I layer and the p-type 1,2-ethanedithiol (EDT) treated PbS QD layer (PbS-EDT QD layer), (3) the interface between the PbS-EDT layer and the Au electrode. After passivating the ZnO layer through APTES treating; tuning the band alignment through varying the QD size of PbS -EDT QD layer and a carbazole layer to tune the hole transport process, a power conversion efficiency of 9.23% (V oc of 0.62 V) under simulated AM1.5 sunlight is demonstrated for PbS QD solar cells. Our results highlights the profound influence of interface engineering on the electron transfer inside the PbS QD solar cells, exemplified by its impact on the photovoltaic performance of PbS QD devices.
研究领域:
材料科学
·
光伏技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Xiujuan Han,Hongfang Zhang,Jianbin Zheng
Colloidosome is a novel nanostructure composed of millions of colloid particles. In this work, nanosized PbS colloidosomes were initially prepared and applied as nanoprobes for an ultrasensitive immunoassay. The colloidosomes were simply prepared in mild conditions by assembling the elementary approximately 8 nm PbS nanoparticles at the water-in-oil interface of emulsion droplets. To enhance the rigidity and biocompatibility of the colloidosomes, interfacial polymer was introduced by utilizing self-polymerization of dopamine. By treating with dilute nitric acid, a bursting release of lead ions from the colloidosomes occurred and the lead ions can be detected easily by anodic stripping voltammetry. In this way, a colloidosome-based electrochemical immunoassay was developed by using the nanosized PbS colloidosomes as electroactive labels. The proposed method featured a linear calibration range from 10 fg·mL–1 to 100 ng·mL–1 with a low detection limit of 3.4 fg·mL–1 for the detection of human epididymis protein 4. This work introduced a new member for the family of colloidosomes and offered a novel perspective for the rational implementation of various colloidosomes for novel low-abundance cancer biomarkers analysis.
研究领域:
纳米技术
·
分析化学
·
生物标志物检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 27
·15149-15157
·
IF 2.936
Wenhui Gao,Guangmei Zhai,Caifeng Zhang,Zhimeng Shao,Lulu Zheng,Yong Zhang,Yongzhen Yang,Xuemin Li,Xuguang Liu,Bingshe Xu
An initial improvement in performance of PbS quantum dot solar cells composed of one thick layer of PbS quantum dots (QDs) treated with tetrabutylammonium iodide (PbS–TBAI) and one thin layer of PbS QDs capped with 1,2-ethanedithiol (PbS–EDT) over short-term air exposure is widely observed. However, the underlying mechanisms still remain elusive. In the work, we sought to understand the mechanisms as well as their physicochemical origins using a combination of X-ray photoelectron spectroscopy (XPS) and various electronic measurements. It is found that the PbS–TBAI film plays a dominant role in the initial device performance improvement compared with the PbS–EDT film. The PbS–TBAI film is compensation doped upon short-term air exposure (one to three days) owing to the increase of Pb–O and/or Pb–OH species, enabling its energy band to align better with the electron transport layer for more efficient charge extraction. Moreover, it is demonstrated that the short-term air exposure is capable of reducing defects in the devices and improving the diode quality, resulting in an initial increase in device performance. This work contributes to the fundamental understanding of the surface chemistry changes of PbS quantum dots treated by different ligands over air-exposure and the role of surface chemistry of quantum dots in optimizing their photovoltaic performance.
研究领域:
材料科学
·
光伏技术
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Qian Wang,Wen-Qi Chen,Xing-Yu Liu,Yi Liu,Feng-Lei Jiang
Near-infrared (NIR)-emitting PbS quantum dots (QDs) are endowed with good stability, high quantum yield, and long lifetime in the body, so they are promising agents in biological imaging. They quickly form the so-called “protein corona” through nonspecific adsorption with proteins in biological fluids once upon exposure to the biological system. Here, PbS QDs and human serum albumin (HSA) were selected as the model system. Fluorescence quenching spectroscopic studies indicated a static quenching process caused by the addition of PbS QDs, which was corroborated by the UV–vis absorption spectroscopy and fluorescence lifetime. Thermodynamic parameters were obtained by the fluorescence quenching method. The enthalpy change and entropy change were well correlated with the “enthalpy–entropy compensation” (EEC) equation summarized in this work. The slope (α = 1.08) and the intercept (TΔS0 = 34.44 kJ mol–1) indicated that the interaction resembled a protein–protein association. The both negative signs of enthalpy change and entropy change were elucidated by a proposed “two-step association–interaction” (TSAI) model. Agarose gel electrophoresis (AGE) and dynamic light scattering (DLS) showed that the binding ratio was roughly 2:1 (HSA/QDs), resembling sandwich-like structures. Furthermore, the secondary structure of HSA depended on the concentration of added QDs and the incubation time. The results preliminarily uncovered the physicochemical properties of QDs in the presence of proteins and elucidated the role of time evolution. These will inspire us to make the fluorescent QDs more biocompatible and use them in a proper way.
研究领域:
生物化学
·
纳米医学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）