ORCID Profile
0000-0002-7687-9408
Current Organisations
Universidade Federal de Minas Gerais
,
Yunnan University
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Publisher: Wiley
Date: 03-04-2023
Abstract: Enhancing the absorption of incident light and promoting the effective separation of carriers are two effective strategies to improve the power conversion efficiency of lead sulfide quantum dots (PbS CQDs) solar cells. Herein, a simple solution spin‐coating method to synthesize a novel ZnO electron transport layer with a wrinkled surface structure is developed. ZnO‐wrinkled surface structure can enhance the absorption of PbS CQDs solar cells in the range of 600–1000 nm compared with the normal planar ZnO film, leading to the enhancement in the short‐current density. Further, by combining the wrinkled and planar ZnO to form a bilayer ZnO, the energy band alignment between ZnO and PbS CQDs is more suitable for the carrier transmission. Finally, PbS CQDs solar cell based on the bilayer ZnO yields a ch ion efficiency of up to 13.5%, presenting almost 10% enhancement compared to that based on the single planner ZnO. This method provides a simple and cost‐effective method to enhance the efficiency of PbS CQDs thin‐film solar cells.
Publisher: IOP Publishing
Date: 11-01-2021
Abstract: Here, a relative simpler and lower cost method, ion beam sputtering deposition was applied to fabricate diluted magnetic Mn x Ge 1− x quantum dots (QDs). The effects of Ge–Mn co-deposition amount on the morphology and crystallization of Mn 0.03 Ge 0.97 QDs were investigated systematically by employing the atomic force microscopy and Raman spectroscopy techniques. It can be seen that the morphology, density, and crystallinity of Mn 0.03 Ge 0.97 QDs exhibit unique evolution processes with the increase of Ge–Mn co-sputtering amount. The optimal deposition amount for realizing well size-uniform, large-aspect-ratio, and high-density QDs is also determined. The unique evolution route of diluted magnetic semiconductor QDs and the amount of co-sputtering are also discussed sufficiently.
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 12-2019
Publisher: Wiley
Date: 06-06-2023
Abstract: The electrical properties of hole transport layers (HTL) are critical factors for the high performance of lead sulfide quantum dot solar cells (PbS CQDSCs). Herein, the impacts of doping the organic HTL PTB7‐Th with lithium bis(trifluoromethanesulfonimide) (LiTSFI) on the performance of quantum dot solar cells are explored and a notable enhancement in the fill factor is observed. A series of analytical characterizations of the doped HTLs are performed and it is found that doping with LiTFSI significantly deepens the Fermi level of the HTL, thereby improving the charge separation ability within the devices. Additionally, the conductivity of doped HTL is also improved. By optimizing the doping conditions, the doped device achieves a maximum power conversion efficiency of 12.68%. This doping strategy of organic HTL promotes the development of lead sulfide quantum dot solar cell techniques.
Publisher: Elsevier BV
Date: 10-2022
Publisher: Wiley
Date: 27-06-2022
Abstract: Organic/silicon hybrid solar cells have attracted extensive attention owing to their low cost and simple manufacturing process. However, theoretical simulations indicate that the efficiency of organic/silicon hybrid solar cells should exceed 20%. This study demonstrates phosphorus and selenium co‐doped WO 3 nanoparticles used for heterojunction solar cell (HSC) modification and theoretically elaborates the effects of these doping elements. The doped WO 3 nanoparticles are added into poly(3,4‐ethylenedioxythiophene) oly(styrenesulfonate) (PEDOT:PSS) films to optimize the physical properties and qualities of the organic layer. The admixture of P/Se‐WO x greatly improves the open‐circuit voltage and fill factor of Si/PEDOT:PSS solar cell devices. In the hole transport layer (HTL)‐based device, the P/Se‐WO x hybrid PEDOT:PSS HTL yields a power conversion efficiency up to 13.64%, which is substantially higher than those of previously reported undoped and doped devices. The generated W 5+ in optimized WO 3 further indicates that the VI B group elements, such as W or Mo with 5+ state ions, positively influence the HSC performance and would greatly benefit the photovoltaic industry.
Publisher: American Chemical Society (ACS)
Date: 24-07-2015
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 10-2022
Publisher: Wiley
Date: 09-02-2022
Abstract: Efficient carrier transport and extraction is essentially important for perovskite solar cells (PSCs). Here, an outstanding organic material tetraphenyldibenzoperiflanthene (DBP) is used to modify the perovskite/spiro‐OMeTAD interface as the intermediate layer. Using time‐resolved photoluminescence technique and dynamic analysis of photogenerated charge carriers, a significantly faster hole extraction and faster hole transport occurring in perovskite/DBP/spiro interface is demonstrated, this is ascribed to an intermixing layer of perovskite and thin DBP layer. The improved mobility has been further confirmed by the Hall measurement. As a consequence, the improved hole extraction and reduced interface recombination result in an improved performance of PSC, including improved conversion efficiency, mitigated J–V hysteresis, and amelioration of stability under humid conditions. This work provides a detailed insight into the transport and extraction of charge carriers improved by the intermediate layer of organic small molecules as an effective strategy for interface engineering by solution spin coating.
Publisher: Wiley
Date: 12-08-2020
Publisher: Elsevier BV
Date: 10-2021
Publisher: MDPI AG
Date: 16-11-2020
DOI: 10.3390/EN13225986
Abstract: Si/PEDOT: PSS solar cell is an optional photovoltaic device owing to its promising high photovoltaic conversion efficiency (PCE) and economic manufacture process. In this work, dopamine@graphene was firstly introduced between the silicon substrate and PEDOT:PSS film for Si/PEDOT: PSS solar cell. The dopamine@graphene was proved to be effective in improving the PCE, and the influence of mechanical properties of dopamine@graphene on solar cell performance was revealed. When dopamine@graphene was incorporated into the cell preparation, the antireflection ability of the cell was enhanced within the wavelength range of 300~450 and 650~1100 nm. The enhanced antireflection ability would benefit amount of the photon-generated carriers. The electrochemical impedance spectra test revealed that the introduction of dopamine@graphene could facilitate the separation of carriers and improve the junction quality. Thus, the short-circuit current density and fill factor were both promoted, which led to the improved PCE. Meanwhile, the influence of graphene concentration on device performances was also investigated. The photovoltaic conversion efficiency would be promoted from 11.06% to 13.15% when dopamine@graphene solution with concentration 1.5 mg/mL was applied. The achievements of this study showed that the dopamine@graphene composites could be an useful materials for high-performance Si/PEDOT:PSS solar cells.
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA12506H
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4RA15336G
Abstract: Intrinsic degradation kinetic constant of oxalic acid at a double layered anatase TiO 2 photoanode with dominantly exposed {001} facets.
Publisher: World Scientific Pub Co Pte Lt
Date: 05-2018
DOI: 10.1142/S1793292018300037
Abstract: The Quantum Dots/Graphene (QDs/GR) composites have attracted numerous interests caused by its unique physical and chemical properties in past few decades. The shortages of the single QD and graphene materials could be remedied by the synergistic effects from QDs/GR composite materials meanwhile, some unique phenomena and superior physical properties were also produced. The QDs/GR composites processed better photocatalytic activities, higher photon capture abilities and excellent optical responsibilities. Therefore, they were widely applied in various techniques. Here, we reviewed and discussed recent research progresses about the QDs/GR composites and focused on their industrial preparation and commercial applications. Among these synthetic methods, ion beam sputtering deposition (IBSD) and molecular beam epitaxy (MBE) were discussed in detail because they could be directly applied in commercial industry for preparing size-tunable quantum dots. In another part, the applications of the QDs/GR composites were also discussed, the advanced physical and chemical properties promoted these composites to have numerous potential for being applied in photodetectors, lithium ion batteries, solar cells, supercapacitors and other devices. The appropriate synthetic method for QDs/GR materials is highly dependent on the requirements of its applications. We firmly believe that the direct synthesis technique of ideal QDs/GR composite for specific applications is a challenge and research emphasis for scientist and engineers in future.
Publisher: IOP Publishing
Date: 24-03-2020
Publisher: American Chemical Society (ACS)
Date: 27-07-2021
Publisher: Elsevier BV
Date: 09-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7RA08755A
Abstract: Quantum dots/graphene (QDs/GR) composite materials show a distinct synergistic effect between the QDs and graphene, which has aroused vast attention toward their unique characteristics in the last few decades.
Publisher: Elsevier BV
Date: 08-2022
Publisher: MDPI AG
Date: 08-09-2020
DOI: 10.3390/EN13184659
Abstract: Si/PEDOT: PSS solar cell is an important alternative for photovoltaic device due to its anticipated high theoretical efficiency and simple manufacturing process. In this study, processing silicon substrate with diluted NaOH aqueous solution was found to be an effective method for improving device performance, one that notably improves junction quality and light trapping ability. When immersed in diluted NaOH aqueous solution, the junction quality was improved according to the enlarged fill factor, reduced series resistance, and enhanced minor carrier lifetime. The diluted NaOH aqueous solution immersion etched the silicon surface and helped with the enhancement of light trapping ability, further improving the short-circuit current density. Although diluted NaOH aqueous solution immersion for bare silicon could improve the performance of devices, proper immersion time was needed. The influence of immersion time on device performances was investigated. The photovoltaic conversion efficiency easily increased from 10.01% to 12.05% when silicon substrate was immersed in diluted NaOH aqueous for 15 min. This study contributes to providing efficient and convenient methods for preparing high performance Si/PEDOT: PSS solar cells.
Publisher: Elsevier BV
Date: 09-2015
DOI: 10.1016/J.JCIS.2015.05.016
Abstract: Anatase TiO2 (001) surfaces have attracted great interest for photo-degradation of organic species recently due to their high reactivity. In this work, adsorption properties and oxidation mechanisms of oxalic acid on the anatase TiO2 (001) surface have been theoretically investigated using the first-principles density functional theory. Various possible adsorption configurations are considered by ersifying the connectivity of carboxylic groups with the surface. It is found that the adsorption of oxalic acid on the anatase (001) surface prefer the dissociative states. A novel double-bidentate configuration has been found due to the structural match between oxalic acid and the (001) surface. More charge is transferred from the adsorbed oxalic acid to the surface with the double-bidentate configuration when comparing with other adsorption structures. Thus, there is a positive correlation relationship between the transferred charge amount and the interfacial bond numbers when oxalic acid adsorbs on the anatase TiO2 (001) surface. The adsorption energies with dispersion corrections have demonstrated that the van der Waals interactions play an important role in the adsorption, especially when adsorbates are close to the surface.
Publisher: Springer Science and Business Media LLC
Date: 17-03-2020
Publisher: Wiley
Date: 29-01-2020
Publisher: Elsevier BV
Date: 10-2022
Publisher: IOP Publishing
Date: 24-01-2018
Abstract: A series of zero-dimensional Ge/Si quantum dots (QDs) s les are fabricated by inducing the transformation from the two-dimensional Ge thin film, which is grown by the traditional direct current (DC) magnetron sputtering, via regulating the annealing process. The QD density increases sharply after the post rapid thermal annealing (PRTA). The observations of atomic force microscopy (AFM) and Raman spectroscopy suggest that the good morphology of Ge QDs results from an appropriate thermodynamics and kinetics surrounding shaped by the cooperative interaction of the Ge-Si lattice mismatch, the film's surface temperature, and the difference in thermal expansion coefficients between Ge and Si. The photoluminescence (PL) peaks of Ge QDs are detected in monolayer Ge QDs with ultrahigh density at 17 K. The Metal-Ge/Si QDs-Metal (MGM) photodetector fabricated from the ultrahigh-density QDs s le exhibits a relatively high current gain, absolute photoelectric responsivity, and internal quantum efficiency (IQE). Our results demonstrate that the high-quality Ge QDs with strong light absorption and quantum confinement effect can be realized by modulating DC magnetron sputtering and the PRTA process. This paves the way for realizing silicon-based optoelectronic devices with high performance by the traditional, relatively low-cost, and large-scale production nanomaterial fabricating method.
Publisher: Wiley
Date: 12-01-2022
DOI: 10.1002/CEY2.158
Abstract: Over the past few decades, the design and development of carbon materials have occurred at a rapid pace. In particular, these porous graphene‐like carbon nitride materials have received considerable attention due to their superior structures and performances in the energy transformation field. In this review, nitrogenated holey two‐dimensional graphene and polymeric carbon nitride will be discussed in depth. The structural properties, synthetic methods, and applications including electrocatalytic reactions, such as hydrogen evolution reaction, oxygen reduction reaction, oxygen evolution reaction, and nitrogen reduction reaction, will be presented in detail. Finally, we will present the outlooks on the current obstacles to the development of carbon nitride materials. This comprehensive understanding will help guide and motivate researchers to develop and modify carbon nitride materials with better properties in the future.
Publisher: Springer Science and Business Media LLC
Date: 11-06-2018
Publisher: American Chemical Society (ACS)
Date: 28-09-2023
Publisher: Elsevier BV
Date: 02-2021
Publisher: World Scientific Pub Co Pte Lt
Date: 07-2020
DOI: 10.1142/S1793292020500873
Abstract: Anatase TiO 2 photocatalysts with exposed (001) facets have attracted great attention for environmental protection technology due to their high reactivity for degradation of organic species. In this work, potassium hydrogen phthalate (denoted as KHP), as the most commonly used reference standard solution for calibrating photoelectrochemical chemical oxygen demand (denoted as PeCOD) instrument, was selected as the study s le. The intrinsic degradation kinetics of KHP on (001) surface was investigated by a photoelectrochemical (denoted as PEC) method with a purposely (001) faceted double-layered structure TiO 2 photoanode. The high kinetics constants of fast process of KHP and other acids indicate that the (001) surface possesses a higher reactivity of aromatic carboxylic acid as theoretically predicted. Meanwhile, the investigation of the KHP adsorption properties on A001 photoanode provides the possibility of using this photoanode as a sensor in a new type of PeCOD instrument for organic acid determination.
Publisher: MDPI AG
Date: 05-03-2022
DOI: 10.3390/MOLECULES27051710
Abstract: Reducing the surface reflectivity of silicon substrates is essential for preparing high-performance Si-based solar cells. We synthesized pyramid-nanowire-structured Si (Si-PNWs) anti-reflection substrates, which have excellent light-trapping ability ( % reflectance). Furthermore, diethyl phthalate (DEP), a water-insoluble phthalic acid ester, was applied to optimize the Si-PNWs/PEDOT:PSS interface the photoelectric conversion efficiency of heterojunction solar cells was shown to increase from 9.82% to 13.48%. We performed a detailed examination of the shape and optical characteristics of Si-PNWs, as well as associated photoelectric performance tests, to investigate the origin of performance improvements in Si-PNWs/PEDOT:PSS heterojunction solar cells (HSCs).
Publisher: American Physical Society (APS)
Date: 10-07-2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CP23143C
Abstract: Ti-O based materials have attracted great attention recently for their potential applications in clean energy generation and environment remediation. To screen Ti-O based materials for specific applications, the atomic-level understanding of the subtle discrepancy of their properties is of paramount importance. In this regard, the density functional theory computations have been performed to systematically compare the physicochemical properties of three selected Ti-O based materials: anatase titanium dioxides, sodium trititanates and sodium hexatitanates. Due to their structure discrepancy, sodium trititanates show the highest chemical reactivity. However, titanium dioxides are found to be the most photoactive materials. The reactivity and photoactivity of sodium hexatitanates fall between those of titanium dioxide and sodium trititanates. In the meantime, our energetic analysis also confirms that the thermal stabilities of Ti-O based materials are strongly dependent on the acid-base conditions. Titanium dioxides are preferred under acidic conditions, while titanates are more stable in basic solutions.
Publisher: Springer Science and Business Media LLC
Date: 30-05-2019
Publisher: IOP Publishing
Date: 20-03-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8RA07904H
Abstract: A novel silver interlayer is used to improve the electrochemical performance of the binder-free Si-based thin film anodes.
Publisher: Research, Society and Development
Date: 18-09-2022
DOI: 10.33448/RSD-V11I12.34356
Abstract: Aim: To translate, cross-cultural adapt and investigate the measurement properties of the 25-point Friendship Scale to Brazilian-Portuguese. Methods: Translation and adaptation of the 25-point Friendship Scale to Brazilian-Portuguese was conducted at first. Then, the new version was administered to 160 Brazilians to investigate test-retest reliability, internal consistency, standard error of the measurement (SEM), minimal detectable change (MDC), ceiling and floor effects, and concurrent validity. To investigate concurrent validity, the Brazilian–Portuguese version of the 0-100 EuroQol Visual Analog Scale (EQ VAS) was used to assess people’s self-reported health status. Results: The Brazilian-Portuguese version has good to excellent reliability (ICC of 0.76, 95% CI 0.61 – 0.85) and had moderate internal consistency (Cronbach’s alpha value of 0.78, 95% CI: 0.73 – 0.83). To avoid measurement error and to exceed variability, scores need to be greater than 1.33 (SEM) and 3.69 (MDC) on the 25-point scale, respectively. There was no ceiling and floor effects. For concurrent validity, there was a small positive correlation between the Friendship Scale and the EQ VAS (Spearman rs = 0.24 p .01). Conclusions: The new Brazilian–Portuguese version of the Friendship Scale has acceptable measurement properties to assess people over 18 years old’s perception of social isolation.
Publisher: Springer Science and Business Media LLC
Date: 05-04-2021
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