Papers by Keyword: Solar Cell

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Authors: Artur Medvid', Pavels Onufrijevs, Edvins Dauksta, Volodymyr Kyslyi
Abstract: The possibility to form “black silicon” on the surface of Si structure by Nd:YAG laser radiation has been shown. The shape and height of micro-cone structure strongly depends on Nd:YAG laser intensity and number of laser pulses. Light is repeatedly reflected between the cones in the way that most of it is absorbed. Si micro-cone structure spectral thermal radiation is close to black body spectral radiance, which makes this structure useful for solar cells application. The micro-chemical analysis performed by SEM has shown that the microstructures contain NiSi2. This was approved by presence of LO phonon line in Raman back scattering spectrum. The control of micro-cone shape and height was achieved by changing the laser intensity and number of pulses.
Authors: Fatin Hana Naning, S. Malik, Zanuldin Ahmad
Abstract: Cadmium sulfide (CdS) were synthesised directly in the active layer of solar cell by mixing regioregular poly (3-hexylthiophene-2,5-diyl) or P3HT with stearic acid, and exposed to hydrogen sulfide gas. The exposure times to hydrogen sulfide gas were varied and the isotherm of P3HT:Stearic acid obtained show that the presence of cadmium ions in the subphase changes the gas-liquid-solid transformation profile. UV-Vis-NIR results indicated that exposure to hydrogen sulfide gas created CdS particles resulting in wider absorption spectra. The exposed P3HT:SA active layer exhibit high resistance that affects short circuit current density and open circuit voltage of the solar cells device. Keywords: CdS, P3HT, Thin Film, Angle Lifting Deposition, Solar Cells
Authors: Keh Moh Lin, Yang Hsien Lee, Wen Yeong Huang, Po Chun Hsu, Chin Yang Huang, Zhu Fu Hsieh
Abstract: To find out the important factors which decisively affect the soldering quality of photovoltaic modules, solar cells were soldered under different conditions (different temperatures, PbSn vs. SnAgCu solder, manual vs. semi-automatic). Experimental results show that the soldering quality of PbSn under 350°C in the semi-automatic soldering process was quite stable while the soldering quality of lead-free solder was generally unacceptable in the manual or semi-automatic process under different temperatures. This result indicates that the soldering process with lead-free solder still needs to be further improved. It was also found that most cracks were formed on the interface between the solder and the silver paste and then expanded outwards.
Authors: Peng Wang, Li Bo Fan, Li Juan Sun, Zhen Hua Zhang, Xin Bing Zhu, Yan Ge Zhang, Pin Jiang Li
Abstract: A film solar cell was made with a structure of Glass/ITO/CdS/PbS/Al. CdS film was obtained by thermal evaporation. PbS film was prepared by a simple solid-solid reaction. The solar cells are photosensitive in a large spectral range (extending from near infrared to high energy side regions). The cell with the area of 0.15 cm2 without any special treatment has shown the values of open-circuit voltage (Voc) of 138 mV and short circuit current (Jsc) of 0.01 mA/cm2 with the efficiency of 0.33 % and the fill factor (FF) is 0.26 under illumination intensity of 100 mW/cm2.
Authors: Shu Lin Liu, Feng Juan Wu, Yi Bo Ma
Abstract: A novel MPPT control strategy with only sampling the port voltage of the solar cell is presented in this paper. The principle of the MPPT system is analyzed and the criterion to reach the maximum power point is deduced. Based on the obtained criterion, a novel algorithm realizing MPPT is proposed. The feasibility of the proposed control strategy and the correctness of the theoretical analysis are verified by the experimental results.
Authors: Xue Ye Wei, Bin Guo, De Yue Li, Gzhong Yang
Abstract: The output characteristics of a PV array vary nonlinearly when the number of solar cells interconnected in series and parallel changes. The model and its parameters for a single solar cell are analyzed firstly. Then the models and there parameters for series, parallel circuits and series-parallel PV array are proposed respectively using circuit theory and observational method. Especial, the parameters of the equivalent circuits for PV arrays are characterized by a equation. A simulations are implemented to verify the three types of theoretical models and there parameters.Keywords: Solar cell; Model; PV array; I-V curve; Equivalent circuit
Authors: Tadao Watanabe, Kota Kido, Sadahiro Tsurekawa, Koichi Kawahara
Abstract: A new approach to grain boundary engineering for photovoltaic polysilicon has been attempted using a new processing method of unidirectional and rotational solidification from the melt, in order to control the grain boundary microstructure and to produce desirable bulk electrical properties. The effect of grain boundary microstructure on bulk electrical properties of polysilicon can be more precisely evaluated by introducing a new parameter “directional grain boundary density (DGBD)” in connection with basic knowledge of structure-dependent grain boundary electrical properties, the grain boundary character distribution (GBCD) and grain boundary geometrical configuration which can be experimentally determined by Orientation Imaging Microscopy (OIM). We report the usefulness of this approach to development of high performance polysilicon.
Authors: Thankaraj Salammal Shyju, Manidurai Paulraj
Abstract: The vertically aligned TiO2 Nanotubes (TiNTs) extracts electrons from an absorber and also helps in its transport in perovskite and dye sensitized solar cells (DSSCs) solar cells. Thus electron transporting layer plays a very important role in photon to electron conversion. Electrochemical anodization is been used widely to grow TiNTs for solar cell applications; due to its low cost, flexibility to vary pore diameter and tube length. We observed that, TiNTs maintained its tubular array only for a set time period. On increasing the growth time they begin to take the form of nanocrystals with {001} facets. Formation of these titanium nanocrystals (TiNcs) was clearly observed through field emission scanning electron microscope (FESEM) and Transmission electron microscopy (TEM). Thus TiO2 nanostructures can be tuned by varying anodization time. More importantly, optimization of the reaction process led to the growth of more orderly, crystalline anatase TiNTs/TiNcs over Ti metal foil substrate. The crystal structure and surface morphology of the prepared thin film samples were studied using X-ray diffraction (XRD) technique and scanning and transmission electron microscopes (TEM). XRD confirmed the anatase phase of as grown TiO2 with (101) as major intensity preferred orientation. Lattice parameters calculated were found to be a= 3.77-to-3.82 and c= 9.42-to-9.58 for grown TiO2.
Authors: Li Qiu Wang, Xin Xin Deng, Liang Tian
Abstract: In this paper, a novel photosynthetic bacteria solar cell with Rhodopseudomonas as the electricity generation bacteria was designed and prepared, and photo current changing with the time of the cell was investigated by testing current-time(i-t) curve under alternating light and dark. The results showed that the maximum photo current of the cell could be 13 μA. The influence of glucose, sucrose, chitosan, anthraquinone and hydroquinone on the photo current was investigated. The results indicated that glucose and chitosan made the photo current of solar cell increased about 21 μA and 27 μA, respectively; but sucrose, anthraquinone or hydroquinone had not such effect. It illustrated that photo electrons could be emitted by Rhodopseudomonas and were transmitted to the anode of the cell in the presence of electronic media under light, and the photo current could be improved further by the adding of some additives.
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