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Enhanced current density of anatase TiO2 nanowire arrays by interface connection modulation in flexible quantum dot sensitized solar cells
摘要： The stability and photovoltaic conversion efficiency are very important issues for the industry application of flexible solar cells, which have been seriously limited by the interface connection of basic photo-electrodes in solar cells. Here, one-dimensional TiO2 nanowire arrays films were employed as photo-electrodes of flexible solar cells, which have modulated interface connection of the photo-electrodes by introducing small size of nanoparticles and heating pressure process. The charge generation and separation properties of photo-electrodes have been influenced, which may be attributed by the changes on band energy of small size of nanoparticles in photo-electrodes. With the improvement on the interface connection in the photo-electrodes, the charge transfer property has been effectively improved, which have exhibited a higher current density value of the solar cells, achieving photovoltaic conversion efficiency enhancement from 2.55% to 3.90%. Moreover, there have no obvious changes on the photovoltaic conversion efficiency of these flexible QDSSCs solar cells under the curling condition.
关键词： Anatase TiO2 nanowire arrays,Flexible quantum dot sensitized solar cell,Interface connection,Photovoltaic performance enhancement,Small size of nanoparticles,Heating pressure
更新于2025-09-23 15:19:57
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Performance enhancement of AlGaN-based deep ultraviolet light-emitting diodes by using stepped and super-lattice n-type confinement layer
摘要： In this paper, a new n-type confinement layer that uses the stepped and super-lattice structure to replace conventional n-type AlGaN layer of deep ultraviolet light-emitting diode (DUV LED) is investigated. The simulation results indicate that the new structure significantly enhances the light output power (LOP) and internal quantum efficiency (IQE) of DUV LED. This is because the capability of carrier confinement in the quantum wells (QWs) is enhanced; the carrier concentrations and the radiative recombination rate in the active region of DUV LED are improved.
关键词： n-type confinement layer,DUV LED,Performance enhancement
更新于2025-09-23 15:19:57
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Design and Modeling for the Performance Enhancement of Solar Photovoltaic/Thermal (PV/T) Collectors
摘要： In this paper, a simulation of a photovoltaic-thermal hybrid (PV/T) solar system with longitudinal fins absorbers was developed in order to determine optimal geometry parameters for conventional design of this system. In this case, we used a dynamic model based on the Principe of the airflow rate to determine the optimum design of the PVT system for each airflow velocity. In this regard, the influences of the geometric parameters (number, height), on the collector performance of each model with different flow velocities were investigated. The mathematical model is developed using the energy balance equations of the PV/T air collector. A good agreement between with the simulation results is obtained and the reference data from the literature, after the system PV/T air collector is evaluated by calculating the root mean square error. The studied cases indicate that for the four simulated models, the best highest performance rate is providing with the first model at 2 m/s airflow velocity. The thermal and electric ef?ciencies were reached, respectively, 83% and 12.85%, with the maximum temperature value on the photovoltaic cell as 56.8°C. However, a combined efficiency for the hybrid PV/T solar collector which is the sum of the electrical efficiency and thermal efficiency is equal to 95.98%.
关键词： PV/T air collector,Rate Performance,Performance enhancement,Geometric Parameters
更新于2025-09-19 17:13:59
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Orientation modulation of ZnO nanorods on charge transfer performance enhancement for Sb2S3 quantum dot sensitized solar cells
摘要： ZnO nanorods nanorod films are prepared by electrochemical deposition process, which are employed as the photo-electrodes for the Sb2S3 quantum dot sensitized solar cells. The orientation of ZnO NRs nanorods (NRs) is modulated by different heating time. The changing on orientation of ZnO NRs has no influences on UV-Vis absorption spectra. And the photoluminescence spectra have indicated that the random orientation ZnO NRs have the better charge separation property. Due to the much more transfer paths from the random orientation of ZnO NRs, the Sb2S3 quantum dot sensitized ZnO NRs solar cells by heating time of 20 min has exhibited an excellent charge transfer property, which can obtain much higher current density of the solar cells, achieving a photovoltaic power conversion efficiency of 2.43%.
关键词： ZnO nanorods films,Sb2S3 quantum dot sensitized solar cells,orientation modulation,charge transfer performance enhancement
更新于2025-09-19 17:13:59
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Inorganic perovskite engineering through incorporation of a carboxylic acid containing ligand for performance enhancement in perovskite light-emitting diodes
摘要： Inorganic cesium lead halide perovskites (such as CsPbBr3) are emerging as one kind of promising optoelectronic material with good stability, narrow color spectrum and facile bandgap tunability. However, the morphology issue of CsPbBr3 film limits its applications in perovskite light-emitting diodes (PeLEDs). Here, we present an effective strategy of perovskite structure engineering by incorporating a long chain cation ligand (HOOC-PMA-Br) into CsPbBr3, aiming to optimize perovskite morphology and thereby improve device performance. It is found that the HOOC-PMA-Br ligand plays a key role in controlling the dimension and crystal growth of perovskites, attributed to the formation of hydrogen bond networks induced by the carboxylic acid unit. With an optimized doping ratio of HOOC-PMA-Br, (HOOC-PMA)2CsPb2Br7 perovskite not only maintains a 3D structure but also presents excellent morphology with a uniform distribution of smaller grain size, smoother surface and better coverage like that of a quasi-2D structure, along with a much higher photoluminescence quantum yield than that of pure CsPbBr3. Significantly, (HOOC-PMA)2CsPb2Br7 endows PeLEDs with remarkably higher luminance and efficiencies than that of CsPbBr3 based devices.
关键词： morphology,inorganic perovskite,carboxylic acid,performance enhancement,light-emitting diodes
更新于2025-09-16 10:30:52
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Performance Enhancement of All-Inorganic Quantum Dot Light-Emitting Diodes via Surface Modification of Nickel Oxide Nanoparticles Hole Transport Layer
摘要： All-inorganic quantum dot light-emitting diodes (QLEDs) show promise for advanced lighting and display due to their superior advantage in stability. However, all-inorganic QLEDs suffer from the low efficiency because of the exciton quenching and inefficient hole transport from inorganic hole transport layer (HTL) to QDs. Herein, we demonstrate an efficient all-inorganic QLED with NiO nanoparticals (NPs) HTL modified by 11-mercaptoundecanoic acid (MUA). The MUA can passivate the defects of NiO and suppress the exciton quenching. Moreover, the declined valance band level of modified NiO could facilitate the hole transport, promoting the charge balance. In addition, the surface engineering improves the quality of NiO film, leading to the decrease of current leakage. As a result, the maximum current efficiency and external quantum efficiency (EQE) of our QLEDs achieve 5.50 cd/A and 1.28%, respectively, exhibiting the enhancement of 4.5 and 1.72 folds, respectively. Meanwhile, the stability of the device is drastically improved by more than 20 folds after modifying the NiO with MUA. The strategy offers a pathway to enhance the efficiency and the operation lifetime of all-inorganic QLEDs.
关键词： exciton quenching,nickel oxide nanoparticles,performance enhancement,surface modification,all-inorganic quantum dot light-emitting diodes
更新于2025-09-16 10:30:52
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Tuning methylammonium iodide amount in organolead halide perovskite materials by post-treatment for high-efficiency solar cells
摘要： In this study, the composition of organic-inorganic perovskite materials is tuned by methylammonium iodide (MAI) post-treatment for high photovoltaic performance. By spin-coating MAI solutions of different concentrations, the amounts of PbI2 and MAI in perovskite layers are tuned. In perovskites, the removal of PbI2 through a reaction with MAI decreases the hysteresis in photocurrent density-voltage curves. Further, by treating perovskites with a high-concentration MAI solution, the excess MAI is incorporated into the perovskites. These perovskites with excess MAI show better power conversion efficiencies (of up to 20.7%) than perovskites with excess PbI2, because of the decrease in trap density. Since the present post-treatment can control perovskite composition without affecting the morphology and crystallinity of the perovskite crystals, this technique would be a useful tool to improve the photovoltaic performance of perovskite solar cells.
关键词： ion composition,performance enhancement,perovskite solar cells,trap density,surface treatment
更新于2025-09-12 10:27:22
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Performance enhancement of novel antipodal Vivaldi antenna with irregular spacing distance slots and modified-w-shaped metamaterial loading
摘要： This paper proposes a novel enhanced far-field performance antipodal Vivaldi antenna (AVA) by including slots into the flare with irregular spacing distance between each other and modified-w-shaped metamaterial (MWSM) unit cells etched on both sides of the substrate. The MWSM unit cell is simulated in finite element method commercially available software HFSS version16 and the effective parameters of the meta-atom are extracted by homogenization retrieval method based on transmission and reflection coefficients. Electric field and surface current distribution are displayed to qualitatively explain the occurrence of near-zero index permittivity, permeability and refraction index in 10 GHz. The unloaded and loaded modeled AVA simulation is provided, respectively, in detail and manufacturing procedure is conducted to verify the effectiveness of the suggested ideas. The return loss measurement indicated a good impedance match between the bare AVA and the loading composite MWSM unit cells despite little discrepancy compared to the simulation results. Numerical simulation reveals that the gain of the composite AVA increases from 7.5 to 11.52 dB after loading with the irregular spacing distance slots in the flare and MWSM unit cells etched substrate. The half-power beamwidth decreased from 72.4° to 41.4° for the E-plane and reduced to 33.38° from 63.4° for the H-plane, respectively. The measured results of the fabricated prototype are consistent with the simulated ones with slight discrepancy. This presented strategy will combine the advantages of the lens effect of metamaterial on the AVA and modified radiating flare, thus keeping the low profile of the whole structure all the time.
关键词： performance enhancement,modified-w-shaped metamaterial,Antipodal Vivaldi antenna,irregular spacing distance slots
更新于2025-09-09 09:28:46