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- 摘要
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- 实验方案
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Rear‐Passivated Ultrathin Cu(In,Ga)Se <sub/>2</sub> Films by Al <sub/>2</sub> O <sub/>3</sub> Nanostructures Using Glancing Angle Deposition Toward Photovoltaic Devices with Enhanced Efficiency
摘要： In this work, for the first time, the addition of aluminum oxide nanostructures (Al2O3 NSs) grown by glancing angle deposition (GLAD) is investigated on an ultrathin Cu(In,Ga)Se2 device (400 nm) fabricated using a sequential process, i.e., post-selenization of the metallic precursor layer. The most striking observation to emerge from this study is the alleviation of phase separation after adding the Al2O3 NSs with improved Se diffusion into the non-uniformed metallic precursor due to the surface roughness resulting from the Al2O3 NSs. In addition, the raised Na concentration at the rear surface can be attributed to the increased diffusion of Na ion facilitated by Al2O3 NSs. The coverage and thickness of the Al2O3 NSs significantly affects the cell performance because of an increase in shunt resistance associated with the formation of Na2SeX and phase separation. The passivation effect attributed to the Al2O3 NSs is well studied using the bias-EQE measurement and J–V characteristics under dark and illuminated conditions. With the optimization of the Al2O3 NSs, the remarkable enhancement in the cell performance occurs, exhibiting a power conversion efficiency increase from 2.83% to 5.33%, demonstrating a promising method for improving ultrathin Cu(In,Ga)Se2 devices, and providing significant opportunities for further applications.
关键词： nanostructure,CIGS solar cells,Al2O3 passivation layer,glancing angle deposition
更新于2025-09-19 17:13:59
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Atoma??photon entanglement near a plasmonic nanostructure
摘要： We investigate the atom–photon entanglement between a four-level double V-type quantum system and a linearly polarized ?eld near a plasmonic nanostructure in the presence of a static magnetic ?eld. It is demonstrated that the magneto-optical effect can affect the atom–photon entanglement only when the atom is near the plasmonic nanostructure. We show that atom–photon entanglement increases when the quantum system is placed near the plasmonic nanostructure in order to modi?cation of the spontaneous decays of the quantum system. It is demonstrated that the degree of entanglement (DEM) increases by increasing the intensity of the linearly polarized ?eld when the quantum system is close to the surface of the plasmons. Moreover, we ?nd that near the plasmonic nanostructure, the static magnetic ?eld has a major role in increasing the steady-state DEM so that the DEM is completely demolished in the absence of the static magnetic ?eld. Finally, it is shown that the atom–photon entanglement near a plasmonic nanostructure is destroyed by free space decay rate.
关键词： degree of entanglement,static magnetic ?eld,atom–photon entanglement,plasmonic nanostructure,spontaneous emission
更新于2025-09-19 17:13:59
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A monolithic nanostructured-perovskite/silicon tandem solar cell: feasibility of light management through geometry and materials selection
摘要： The use of several layers of different materials, taking advantage of their complementary bandgap energies, improves the absorption in multi-junction solar cells. Unfortunately, the inherent efficiency increment of this strategy has a limitation: each interface introduces optical losses. In this paper, we study the effects of materials and geometry in the optical performance of a nanostructured hybrid perovskite – silicon tandem solar cell. our proposed design increases the performance of both subcells by managing light towards the active layer, as well as by minimizing reflections losses in the interfaces. We sweep both refractive index and thickness of the transport layers and the dielectric spacer composing the metasurface, obtaining a range of these parameters for the proper operation of the device. Using these values, we obtain a reduction in the optical losses, in particular they are more than a 33% lower than those of a planar cell, mainly due to a reduction of the reflectivity in the device. This approach leads to an enhancement in the optical response, widens the possibilities for the manufacturers to use different materials, and allows wide geometrical tolerances.
关键词： light management,silicon,perovskite,tandem solar cell,nanostructure,optical losses
更新于2025-09-19 17:13:59
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Boosting ultrathin aSi-H solar cells absorption through a nanoparticle cross-packed metasurface
摘要： Hydrogenated amorphous silicon (a-Si:H) solar cells have some performance limitations related to the mobility and lifetime of their carriers. For this reason, it is interesting to explore thin-film solutions, achieving a tradeoff between photons optical absorption and the electrical path of the carriers to get the optimum thickness. In this work, we propose the insertion of a metasurface based on a cross-patterned ITO contact film, where the crosses are filled with nanospheres. We numerically demonstrate that this configuration improves the photogenerated current up to a 40% by means of the resonant effects produced by the metasurface, being independent on the impinging light polarization. Light handling mechanisms guide light into the active and auxiliary layers, increasing the effective absorption and mitigating the Staebler-Wronski effect. The selection of optimum materials and parameters results in nanospheres of ZnO with a 220 nm radius.
关键词： a-Si hydrogenated solar cell,Short-circuit current,Metasurface,Absorption enhancement,Nanostructure
更新于2025-09-19 17:13:59
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Electronic and optoelectronic performance of nano-Vanadyl 2,3-naphthalocyanine/n-Si (organic/inorganic) solar cells: Temperature dependence
摘要： Vanadyl 2,3-naphthalocyanine (VONc) /n-Si heterojunction was prepared by vacuum deposition of VONc compound onto n-Si single crystals. The analysis of the X-ray diffraction pattern and the scanning electron microscopy images reveal the nanostructure nature of the deposited VONc film. At low voltage, the temperature dependence of current density-voltage characteristics corroborates that the multi-tunneling mechanism is the dominant current mechanism for the dark forward bias. In the case of the higher forward bias (0.4<V<2 V), the conduction mechanism is a space charge limited current dominated by a single trap level. The capacitance-voltage characteristics imply that the junction has an abrupt heterojunction description and the value of built-in voltages, at room temperature, was estimated to be 0.67 eV. The values of the open-circuit voltage, the short-circuit current, fill factor and power conversion efficiency under illumination (100 mW/cm2) and at room temperatures were calculated to be 0.70 V, 11.30 mA/cm2, 0.394 and 3.12 %, respectively. These results indicate that VONc/n-Si heterojunction is characterized by remarkable considerable photovoltaic properties comparing with the other organic/inorganic heterojunctions.
关键词： photovoltaic,nanostructure films,Heterojunctions,organic materials
更新于2025-09-19 17:13:59
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Neuron-like cell differentiation of hADSCs promoted by a copper sulfide nanostructure mediated plasmonic effect driven by near-infrared light
摘要： Nerve is one of the most difficult tissues to repair due to the limited source of neural stem cells and the difficulty to promote the neural differentiation of mesenchymal stem cells by growth factors. Electromagnetic field has been proved to have the ability to regulate stem cells differentiation. Although some researches promoted neural differentiation of stem cells by external power source, it is still a big challenge to realize the nerve repair in bodies because of the unwieldiness and complexity of the power supply equipment. Surface plasmon (SP) is electromagnetic oscillation caused by the interaction of free electrons and photons on metal surface, and almost no one has used this localized electromagnetic oscillation to regulate stem cells differentiation. In this study, based on the concept proposed by our group that “Regulation of stem cell fate by nanostructure mediated physical signal”, the localized electromagnetic oscillation generated by the localized surface plasmon resonance (LSPR) of copper sulfide (CuS) nanostructure irradiated by near-infrared light has been proved to have positive regulation on stem cell maturation and neuron-like cell differentiation of human adipose-derived stem cells (hADSCs). This regulation method avoids the use of wire connection of external power source, which realizes the stem cell fate regulation by external field. In addition, this work demonstrated that it is promising to realize the light promoted nerve repair in bodies by using implantable plasmonic nanomaterial with absorption in near-infrared region within human “optical window”, which has important academic value and application prospect. As we know, this is the first time to use semiconductor nanostructures as a medium to regulate stem cells neuron-like cell differentiation by near-infrared light and LSPR of plasmonic nanomaterial, which will have great influence on biomedical engineering and attract broad attention from nanomaterials scientist, neurobiologist, and neurosurgeon.
关键词： neuron-like cell differentiation,plasmonic effect,near-infrared light,hADSCs,copper sulfide nanostructure
更新于2025-09-19 17:13:59
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Anisotropic Plasmonic Nanostructure Induced Polarization Photoresponse for MoS <sub/>2</sub> a??Based Photodetector
摘要： Techniques that give anisotropic properties to 2D materials with isotropic crystal structures will enable 2D material based photodetectors to possess polarization sensitivity in the detection of polarization, which will greatly improve the spatial resolution of photodetectors. Here, an MoS2-based polarization photodetector induced by anisotropic plasmonic nanostructure is prepared. The integrating anisotropic plasmonic structures on a few-layer MoS2 nanosheet can induce polarization photoresponse and enhance the responsivity of MoS2 device at the same time. The ratio of the maximum to minimum photocurrents reached 1.45 along two perpendicular polarizations. It proves that anisotropic nanostructure induced polarization sensitivity will pave a new way for the fabrication of polarization photodetectors.
关键词： polarization,plasmonic nanostructure,2D materials,photodetectors
更新于2025-09-19 17:13:59
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Preservation of entanglement and quantum correlations next to periodic plasmonic nanostructures
摘要： We study quantum correlations dynamics of two identical V-type quantum systems initially prepared in an extended Werner-like state, where each one independently interacts with a plasmonic nanostructure. Each V-type system can be decomposed as a two-level system with an additional third external level acting as an “umbrella level.” As the plasmonic nanostructure, we use a two-dimensional array of metal-coated dielectric nanoparticles. For the calculations, we combine quantum dynamics calculations using the density matrix equations and classical electromagnetic calculations. In order to describe the entanglement, we use the measure of entanglement of formation, while we use quantum discord to describe the total quantum correlations of our composite system. We ?nd that the presence of the plasmonic nanostructure leads to high suppression of spontaneous emission rates along with a high degree of quantum interference. These phenomena affect the evolution of both entanglement and quantum discord, while they signi?cantly prolong their dynamics.
关键词： Periodic plasmonic nanostructure,Quantum interference,Quantum discord,Entanglement of formation,Quantum correlations,V-type quantum system
更新于2025-09-19 17:13:59
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Direct fabrication mechanism of pre-sintered Si3N4 ceramic with ultra-high porosity by laser additive manufacturing
摘要： Complex structural Si3N4 ceramics with ultra-high porosity were innovatively formed by selective laser sintering (SLS) technology without any binder. Due to rapid cooling rate, the high temperature phase constituent and microstructure of the SLSed Si3N4 poly hollow microspheres (PHMS) were preserved, thus revealing the bonding mechanism of Si3N4 under the nonequilibrium heat source. Si3N4 PHMS are bonded by microvilli composed of bamboo-structure SiO2 nano?ber clusters, stacked SiO2 nanospheres and smooth α-Si3.72N4 nanowires. Finally, the pre-sintered Si3N4 ceramics with a porosity of 80% are directly fabricated in the atmosphere by SLS, which have the enough strength to satisfy the post-treatment requirements.
关键词： Bonding mechanism,Selective laser sintering,Additive manufacturing,Nanostructure,Silicon nitride
更新于2025-09-16 10:30:52
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Hollow Porous Gold Nanoshells with Controlled Nanojunctions for Highly Tunable Plasmon Resonances and Intense Field Enhancements for Surface-Enhanced Raman Scattering
摘要： Plasmonic metal nanostructures with nanogaps have attracted great interest owing to their controllable optical properties and intense electromagnetic fields that can be useful for a variety of applications, but precise and reliable control of nanogaps in three-dimensional nanostructures remains a great challenge. Here, we report the control of nanojunctions of hollow porous gold nanoshell (HPAuNS) structures by a facile oxygen plasma-etching process and the influence of changes in nanocrevices of the interparticle junction on the optical and sensing characteristics of HPAuNSs. We demonstrate a high tunability of the localized surface plasmon resonance (LSPR) peaks and surface-enhanced Raman scattering (SERS) detection of rhodamine 6G (R6G) using HPAuNS structures with different nanojunctions by varying the degree of gold sintering. As the neck region of the nanojunction is further sintered, the main LSPR peak shifts from 785 to 1350 nm with broadening because the charge transfer plasmon mode becomes more dominant than the dipolar plasmon mode, resulting from the increase of conductance at the interparticle junctions. In addition, it is demonstrated that an increase in the sharpness of the nanojunction neck can enhance the SERS enhancement factor of the HPAuNS by up to 4.8-fold. This enhancement can be ascribed to the more intense local electromagnetic fields at the sharper nanocrevices of interparticle junctions. The delicate change of nanojunction structures in HPAuNSs can significantly affect their optical spectrum and electromagnetic field intensity, which are critical for their practical use in a SERS-based analytical sensor as well as multiple-wavelength compatible applications.
关键词： sintering,plasma etching,nanoporous gold,nanocrevice junction,surface-enhanced Raman scattering,plasmonic nanostructure
更新于2025-09-16 10:30:52