Current Issue : January - March Volume : 2019 Issue Number : 1 Articles : 5 Articles
In this study, Ag@SiO2 nanoparticles were synthesized by a modified Stöber method for\npreparing the TiO2 mesoporous layer of carbon counter electrode-based perovskite solar cells (PSCs)\nwithout a hole transporting layer. Compared with normal PSCs (without Ag@SiO2 incorporated in\nthe TiO2 mesoporous layer), PSCs with an optimal content of Ag@SiO2 (0.3 wt. % Ag@SiO2-TiO2)\nshow a 19.46% increase in their power conversion efficiency, from 12.23% to 14.61%, which is mainly\nattributed to the 13.89% enhancement of the short-circuit current density, from 20.23 mA/cm2 to\n23.04 mA/cm2. These enhancements mainly contributed to the localized surface Plasmon resonance\neffect and the strong scattering effect of Ag@SiO2 nanoparticles. However, increasing the Ag@SiO2\nconcentration in the mesoporous layer past the optimum level cannot further increase the short-circuit\ncurrent density and incident photon-to-electron conversion efficiency of the devices, which is\nprimarily ascribed to the electron transport pathways being impeded by the insulating silica shells\ninside the TiO2 network....
As a strategic emerging industry, solar energy industry has been wished to\nease the energy crisis and stimulate economic growth. In order to judge the\ndevelopment of the industry objectively, this paper constructs the index system\nof Chinaâ??s solar energy industrial development from three dimensions of\nmicro enterprise, medium industry and macroeconomic. This paper simultaneously\ntakes 27 specific indicators, 54 listed companies and 10206 data from\n2010 to 2016 as an example to calculate the industrial development index.\nThe result reveals that with the implementation of the support policies playing\na positive role in the development of Chinaâ??s solar energy industry, the\nsolar industry has steadily improved. Solar energy industry in our country is\nunder the support of national support policies and its technological innovation\ncapability is relatively active. However, the moderate investment and financing\nactivities and inadequate enterprise operational capacity, to some\nextent, alleviate the development of the solar energy industry. The above\nshows that the solar energy industrial development index and its evaluation\nmethods can help people to accurately grasp the development trend of the\nsolar energy industry and accurately identify the development of advantages\nand disadvantages....
The increasing world human population has given rise to the current energy crisis and\nimpending global warming. To meet the international environmental obligations, alternative\ntechnological advances have been made to harvest clean and renewable energy. The solar\nphotovoltaics (PV) system is a relatively new concept of clean technology that can be employed as an\nautonomous power source for a range of off-grid applications. In this study, the dual battery storage\nsystem is coupled with a solar PV system and a low voltage grid, benefitting from the feed-in tariff\n(FIT) policy. The main outcomes of this study are: (I) A novel dual battery storage system for the\noptimal use of the PV system/energy is proposed; (II) The problem is formulated in the form of a\nmathematical model, and a cost function is devised for effective cost calculation; (III) An optimal\ncost analysis is presented for the effective use of PV energy; (IV) real-time data of a solar PV taken\nfrom the owner and the demand profile collected from the user is applied to the proposed approach,\nwith United Kingdom (UK) tariff incentives. This system works in a loop by charging one system from\nthe solar PV for one day, and discharging the other system. This model gives certainty that power is\nexported to the grid when the solar PV generates an excess amount; batteries are utilized during\nthe peak hours, and power is purchased when the demand is not met by the batteries, or when the\ndemand is higher than the generation. This study examined the economic knowledge of solar PV\nand battery storage systems by considering the FIT incentives....
A novel smart solar-powered light emitting diode (LED) outdoor lighting system is\ndesigned, built, and tested. A newly designed controller, that continuously monitors the energy\nstatus in the battery and, accordingly, controls the level of illumination of the LED light to satisfy the\nlighting requirements and/or to keep the light â??onâ? the longest time possible, has been developed.\nThe use of such a reliable solar energy-driven lighting system, with maximum time when the light\nis â??onâ?, will eliminate the sudden-death of light problem present in conventional photovoltaic (PV)\noutdoor lights and, therefore, will enhance the natural surveillance and feeling of safety in sustainable\nbuildings and cities. Furthermore, the new smart control eliminates the overdischarge of the system\nbattery and, thus, ensures a longer lifetime of the system battery. Experimental measurements on a\nsystem using a 30WLED light showed that the operating hours of the new system reached 29.16 h\n(1750 min), while the operating hours for a similar conventional system were 20.86 h (1252 min).\nThus, the new lighting system was demonstrated, securing more than 40% of operating hours than\nthe conventional systems....
It is well known that the major constraints to the efficiency of photovoltaic devices come\nfrom the generation of heat. In this context, thermoelectric generators have been proposed as a viable\nheat recovery solution, leading to an increase of the overall efficiency. Within this kind of hybrid\nsolution, the photovoltaic and thermoelectric parts can be either electrically separated or connected\nin the same circuit. In the latter case, the presence of the thermoelectric generator in series to the\nsolar cell may lead to electrical losses. In this work, we analyze the effect of several parameters\non the output power of electrically hybridized thermoelectric-photovoltaic systems. Both electrical\nmeasurements and simulations are used. The results show that while an electrical lossless condition\nexists (as also reported in previous works), it does not necessarily lead to significant power gains\ncompared to the sole photovoltaic case. In addition, the strong temperature sensitivity of the lossless\ncondition makes electrical hybridization difficult to implement. Since solar irradiation varies over\ntime, such sensitivity would make the system work mostly in a suboptimal regime. Therefore,\nthis study provides clues on the actual applicability of electrically hybridized devices....
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