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oe1(光电查) - 科学论文

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  • The environment coefficients effect on I-V and P-V characteristics curves of photovoltaic cell using Matlab/Simulink

    摘要： Many parameters and environments conditions will affect the behavior of the photovoltaic cell. This paper investigates, theoretically the variation of each temperature and irradiation effects on the output of the photovoltaic cell characteristics. Modeling of the photovoltaic cell scheme essentially requires taking weather data (temperature and irradiance) as input variables. The photovoltaic outputs are the current, voltage and power. Though, conclude the characteristics I-V or P-V desires of these important variables. Any variation in the entries directly shows variations in outputs. The characteristic curves are obtained with the use practical readings and measurements are illustrated directly from the solar power plant in the Technical Engineering College of Mosul. The complete modeling is then computer-generated using MATLAB/Simulink software owing to its common use and its helpfulness.

    关键词： Solar Cell,PV Cell,Single Diode,PV Temperature,PV Irradiation,I-V and P-V Characteristics

    更新于2025-09-23 15:19:57

  • Anti-LID Process with a Remote Direct Heating Method Using a Half-Bridge Resonance Circuit for a PERC Solar Cell Module

    摘要： As the importance of the levelized cost of electricity (LCOE) increases in the solar cell industry, the demand for high-ef?ciency solar cells is rapidly increasing. Typically, p-type passivated emitter rear contact (PERC) solar cells are the most commonly used in the industry, and their ef?ciency is approximately 22–23%. P-type solar cells are reported to exhibit a light-induced degradation (LID) phenomenon, in which their output constantly decreases during power generation under solar radiation, and the output signi?cantly reduces as their reference ef?ciency increases. Ultra-high-ef?ciency solar cells, which are on high demand, have a considerable output reduction due to the LID phenomenon; hence, technologies to prevent the LID phenomenon are required. However, research on this phenomenon has not been conducted because there is no method to transfer heat to solar cells inside the encapsulant when the modules are produced. In this study, a regeneration state was formed by remotely heating solar cells without damaging the encapsulant of the solar cell module. This was accomplished by using a heating method based on an induction magnetic ?eld. A half-bridge resonance circuit was used to apply the induction magnetic ?eld, and the temperature of the solar cell was controlled by adjusting the magnitude of the current ?owing through the coil. To determine whether only the solar cell was heated, the temperature distribution inside the module was analyzed using an IR camera. The minority carrier lifetime was examined by real-time observation of the open-circuit voltage pattern of the solar cell. Finally, the observed real-time open-circuit voltage data were used, and dynamic simulation of the regeneration process was applied to analyze the LID activation energy generated in the regeneration process of the solar cell module. In conclusion, research was conducted on applying the regeneration state to prevent the LID phenomenon in the solar-cell-module stage, and the LID activation energy of the solar cell module was extracted. Based on this, a nondestructive degradation prevention technology for the solar cell module was developed.

    关键词： solar module,half-bridge resonance circuit,light-induced degradation,solar cell,regeneration,remote heating

    更新于2025-09-23 15:19:57

  • Direct dynamic evidence of charge separation in a dyea??sensitized solar cell under operando conditions by Raman spectroscopy

    摘要： Interfaces play an important role in enhancing the energy conversion performance of dye-sensitized solar cells (DSCs). The interface effects have been studied by many techniques, but almost all studies only performed on a portion of DSC, rather than on a complete solar cell. Hence, monitoring the interface evolution of a DSC is still very challenging. Here, in situ/operando resonance Raman (RR) spectroscopic analyses were carried out to monitor the dynamic observations of the photovoltaic conversion process from a DSC. We observed the creation of new species (i.e., polyiodide and iodine aggregates) in the photosensitization process. We also successfully identified molecular-scale dynamic evidence that the bands from the C═C of 2,2’-bipyridyl (bpy), the S═C═N of NCS ligand and photochemical products show reasonably strong intensity and frequency changes, which clearly demonstrates that they are important pathways of charge separation. Furthermore, RR spectroscopy also be applicable to quickly evaluate the performance of DSCs.

    关键词： dye-sensitized solar cell,semiconductor,TiO2 nanotube array,Raman spectroscopy,charge transfer

    更新于2025-09-23 15:19:57

  • Multifunctional behavior of Ca-doped niobium-based double perovskite for photovoltaic/solar cell devices

    摘要： Smart materials of oxide ceramics are usually in the form of single- or polycrystalline. The present ceramic belongs to the polycrystalline compound of Pb1.5Ca0.5BiNbO6 which has a double perovskite structure with the general form of A1.5A′0.5BB′O6. For synthesis and characterization of the sample, a solid solution casting method, X-ray diffraction, scanning electron micrography, Infra-red spectroscopy, etc., have been utilized. Different characterization reveals that the material has a higher value of room-temperature dielectric constant remnant polarization useful for energy storage devices. Optical equities of the ceramic were further analysed by UV–Vis and PL spectroscopy analysis which reveals that the material can be useful for energy harvesting devices like photovoltaic/solar cells. The estimated thermistor parameter suggests that the material can also be useful for thermal sensor devices.

    关键词： Photovoltaic/solar cell devices,Energy storage devices,Ca-doped niobium-based double perovskite,Multifunctional behavior,Thermal sensor devices

    更新于2025-09-23 15:19:57

  • Investigation of KBiFe <sub/>2</sub> O <sub/>5</sub> as a Photovoltaic Absorber

    摘要： KBiFe2O5 (KBFO) was grown by pulsed laser deposition (PLD) on SrTiO3 (001) (STO), 1 at% Nb-SrTiO3 (001) (Nb-STO) and MgAl2O4 (001) (MAO). In the case of MAO substrate, epitaxial growth is obtained. As its bandgap is relatively low (1.6 eV in the bulk), KBFO is a promising candidate for oxide photovoltaics. In this work we examine the growth of KBFO by PLD by looking at its structure and composition and we investigate the optical properties of the films obtained. A photovoltaic architecture based on KBFO films is proposed and a solar cell behaviour based on KBFO absorber is obtained.

    关键词： pulsed laser deposition,solar cell,thin film,photovoltaics,oxide

    更新于2025-09-23 15:19:57

  • Novel conductive multi-walled polymeric nanotubes of poly(diazoaminobenzene) for single-layer polymer solar cell

    摘要： Novel conductive multi-walled polymeric nanotubes (MWPNTs) of poly(diazoaminobenzene) (PDAAB) were synthesized using diazoaminobenzene monomer for the first time in this report. The synthesis followed a one-pot, cost-effective, green and template-free procedure, in which aniline was used as initiator with 87% yield at room temperature. PDAAB was characterized with spectroscopic and microscopic methods such as Fourier-transform infrared (FTIR), UV-vis, X-ray diffractometry (XRD), transmission electron microscopy (TEM), field-emission scanning electron microscopy (FESEM) as well as cyclic voltammetry (CV) and conductivity measurements. In addition, MWPNTs were used in the design of a novel single-layer polymer solar cell. PDAAB was sandwiched between TiO2 nanoparticle-modified fluorine-doped tin oxide (FTO) electrode and an aluminum electrode (FTO-TiO2│PDAAB│Al), as anode and cathode, respectively. Finally, various physical characteristics of the single-layer polymer solar cell were determined under simulated solar irradiation. Our proof-of-concept study demonstrated that MWPNTs provided a promising platform to develop polymer-based solar energy conversion and storage systems.

    关键词： multi-walled polymeric nanotube,aniline,conductive polymers,Poly(diazoaminobenzene),solar cell

    更新于2025-09-23 15:19:57

  • Nitrogen doping of TiO2 and annealing treatment of photoanode for enhanced solar cell performance

    摘要： Mild doping of nitrogen (N) in TiO2 followed by an optimized aerial annealing treatment of CdS quantum dot (QD) sensitized photoanode resulted in ef?cient electron transfer and low recombination rates for the corresponding quantum dot solar cell (QDSC). Nitrogen doping passivates the surface defects in TiO2, reduces the density of recombination centers, and promotes electron injection into the current collector. N-doping also modi?es the electronic band structure of TiO2 and reduces the band gap from 3.17 to 2.91 eV. Therefore in the QDSC with the N-TiO2/CdS photoanode, both N-TiO2 and CdS, undergo charge separation upon illumination thereby producing a higher photocurrent compared to the undoped-TiO2/CdS based QDSC. N-doping also increased the redox activity of TiO2, allowing facile ion and electron transport across its cross-section which is advantageous for solar cell performance. Optimal annealing temperature of 150 (cid:1)C for the N-TiO2/CdS or TiO2/CdS photoanode restricted the back electron movement effectively, and imparted a signi?cantly enhanced power conversion ef?ciency (PCE) to the N-TiO2/CdS@150 (cid:1)C/polysul?de gel/C-fabric- solar cell, greater by 55% compared to its unannealed counterpart. Lowered average excited electron lifetime, increased-incident photon-to-current conversion ef?ciency, recombination resistance and photovoltage decay response time, con?rm the ability of the annealed photoanodes to undergo enhanced charge separation contrasting with the unannealed photoanode. This ?rst time study relies on two simple approaches of nitrogen doping and annealing treatment to achieve considerably improved photovoltaic parameters, and opens up realistic possibilities for commercialization of QDSCs.

    关键词： Annealing treatment,Recombination,Charge transfer,N-doping,Solar cell

    更新于2025-09-23 15:19:57

  • Synthesis of brass nanowires and their use for organic photovoltaics

    摘要： Preponderant electric conductivity, high transmittance properties, and large natural abundance of its main component are striking features of copper nanowire (Cu NW)-based thin films. Because they are easily synthesized via low-cost solution-based processes, copper nanowires are considered an affordable next-generation conductor for transparent electrodes. Copper nanowire applications are expected to become more popular over the next decade. However, copper nanowire itself has a tremendously high surface-to-volume ratio and an abundance of surface atoms which lead to its high reactivity with the external environment. This reactivity presents a challenge for the improvement the long-term stability of copper nanowires, as it directly affects their applications. This novel study demonstrates a process to protect copper nanowires with an ultrathin stable brass layer-Cu/Brass NWs. The final product exhibited a high performance comparable to commonly used electrodes with a low sheet resistance of 30 Ω/sq at 89% transparency. Moreover, the Cu/Brass NWs resisted oxidation corrosion as the amplitude resistance fluctuated only around 3 Ω/sq for 30 days. For performance verification, an organic solar cell was fabricated using a Cu/Brass NW-based transparent electrode. It yielded an efficiency of 5.85%, reaching nearly that of a conventional cell using indium tin oxide. This demonstrates that Cu/Brass NWs are very promising for future application in low-cost optoelectronic devices.

    关键词： Transparent electrode,Copper nanowire,Copper/brass nanowires,Electroless Zn plating,Organic solar cell

    更新于2025-09-23 15:19:57

  • Equivalent Circuit Parameters of Hybrid Quantum-Dot Solar Cells

    摘要： We experimentally investigate the equivalent circuit parameters of hybrid quantum-dot (QD) solar cells consisted of InAs/GaAs and GaSb/GaAs QDs. The hybrid QD solar cell samples are fabricated by stacking one pair and three pairs of InAs/GaAs and GaSb/GaAs QD layers. Four equivalent circuit models are applied to fit the experimentally obtained current-voltage characteristics of the investigated samples. The relevant circuit parameters are photocurrent, reverse saturation current, diode ideality factor, series resistance, and shunt resistance. The best fitted model of all samples contains both series and shunt resistances. According to the fitting result, the diode ideality factor of 2, which indicates the dominant recombination current, is always obtained. Comparing the extracted parameters from two single-pair hybrid QD solar cells, the effects of structural stacking sequence can be discussed in term of light absorption and carrier storage properties. We have found that an increase of stacking number from one pair to three pairs deteriorates the solar cell performance. This might be caused by an excessive total QD layer thickness or a presence of dislocation defects in that sample.

    关键词： Parameter Extraction,Current-Voltage Characteristics,Solar Cell,Quantum Dot

    更新于2025-09-23 15:19:57

  • Graphene/TiO2 nanocomposite electrodes sensitized with tin sulfide quantum dots for energy issues

    摘要： In this work, graphene (Gr)/TiO2 nanocomposite electrodes sensitized with tin sulfide quantum dots (SnS QDs) for energy issues have been investigated. Different sizes of SnS QDs as non-toxic and earth-abundant semi-conducting materials are synthesized onto Gr/TiO2 nanocomposite electrodes using successive ionic layer adsorption and reaction (SILAR) technique for “n” cycles (n: 1 to 8). The structural properties of the prepared SnS (n) QDs photoanodes are studied using an X-ray diffractometer. The XRD measurements ensure the formation of the crystalline structure of orthorhombic SnS QDs. The optical properties of the synthesized SnS(n) QDs photoanodes are characterized using a UV–visible spectrophotometer. The estimated direct (indirect) energy band gap (Eg) of the prepared SnS(n) photoanodes is tuned from 2.36 (1.57) eV to 1.76 (1.30) eV by controlling the number of SILAR cycles from 1 to 8. The photovoltaic performance of the assembled SnS(n) quantum dots sensitized solar cells (QDSSCs) has been studied under a solar power illumination of AM1.5 conditions. The optimal photovoltaic performance of the assembled SnS(n) QDSSCs is achieved at 6 SILAR deposition cycles. As compared with previous studies, enhancement of 48% in the energy conversion efficiency η has been achieved due to the active Gr incorporation. SnS(n) QDSSCs shows high reproducibility and sensitivity undercutting ON-OFF the solar illumination. Gr plays the role of kids slide for the photo-generated electrons and facilitates their transportation.

    关键词： Graphene/TiO2,Reproducibility of QDSSCs,Recombination suppression,Tuning band gap,SnS solar Cell

    更新于2025-09-23 15:19:57