Papers by Keyword: Flexible Solar Cell

Abstract: The flexible dye-sensitized solar cells have a need to improve adhesive property in each layer in order to increase efficiency of this solar cell. Flexible surface with Polyethylene naphthalate (PEN) were modified by using surface treatment from developed the low-pressure high-frequency Plasma Chemical Vapor Deposition system in order to improve adhesive characteristic. The oxygen plasma treatment can improve adhesive property of Polyethylene naphthalate (PEN) films and also cleaning surface. We were using the mixture of Ar and O₂ gas for plasma treatment with oxygen gas flow rate from 0.1 L/min. to 0.5 L/min. while Ar gas flow rate was set at 10 L/min. and 5 minute for treatment time. The results indicate that using low-pressure high-frequency Plasma Chemical Vapor Deposition system can be possible improvement adhesive characteristic of PEN films with radical increased on films.

Abstract: Unmanned Aerial Vehicle (UAV) has an enormous role to both military and civilian missions. However, a short range endurance of current UAV system affects the life expediency, data monitoring, and output performance of a mission. This is due to having UAVs that are dependent on batteries. The weight of the battery and low temperature environment has undoubtedly been the main cause for the poor UAV performance. In spite of its prolific improvement in UAV system, the endurance permissible is between 45 minutes to 4 hours. Therefore, this situation makes battery no longer attractive to be widely used for UAV. Lately attention has been focused on the use of solar cell in UAV in replacement to battery as its power system. Nevertheless, current solar cells characteristic and efficiency is insufficient to sustain a long endurance flight. This is due to failure to identify an appropriate selection of material and parts in designing the UAVs solar augmented power module system. Therefore, comprehensive work on the solar power system and its integration is essential for an excellent UAV performance. Thus, a research work has been done to studies on the design of a solar and battery power system for an electric UAV. Subsequently, a small solar powered electric UAV has been developed. As a result, the UAVs specification, layout and systems description are presented extensively in this paper. This UAV has enabled an understanding how the solar augmented system has enhanced the endurance performance the electric UAV to almost 24 hours. Moreover, this UAV has 5 successfully flight up till date with useful data that predicted this UAV aerodynamic characteristic.

Abstract: In this paper, we report the deposition of nano-crystalline silicon flexible solar cells on stainless steel (SS) substrates for application in solar roof. The influence of substrate treatment on the properties of material and the solar cells was studied by Raman spectroscopy, scanning electron microscope, current-voltage (I-V), and Quantum efficiency (QE) measurements. Results suggest that the properties of the Si:H thin films and solar cells were greatly improved by the substrate treatment with surface polishing and the followed Ag/ZnO electrodes deposition.

Abstract: Upilex-s [poly(biphenyl dianhydride-p-phenylene diamine)] polyimide have been widely employed in the area of flexible electronics. For its potential application on fabricating flexible solar cells, the optical properties of Upilex-s are measured in this paper. Intrinsic hydrogenated amorphous silicon layers are then deposited on Upilex-s substrates at temperatures 100°C and 180°C by plasma enhanced chemical vapor deposition (PECVD) system. As an comparison, intrinsic a-Si:H layers are also fabricated on glass substrate of Corning2000. Both layers on flexible and rigid substrates are thoroughly characterized by activation energy and dark conductivity measurements. It can be concluded that the intrinsic layer on Upilex-s has favorable properties and could be a competitive candidate as substrate materials of flexible solar cells.

Abstract: Silicone dioxide (SiO2) layer as an electrical insulator and diffusion barrier was deposited on a flexible stainless steel substrate by plasma enhanced CVD process. And we deposited Mo/Na-doped Mo bi-layer back contact on the oxide layer in order to supply Na into the CIGS absorber. Then we deposited CIGS layer by three-stage process using elemental co-evaporation method and completed the solar cell fabrication. Without antireflection coating, the best CIGS solar cell on the stainless steel showed the conversion efficiency of 10.57 % with Jsc = 33.38 mA/cm2 and Voc = 0.519 V and FF = 0.61 for an active area of 0.45 cm2.