The temperature functional dependence of VOC for a solar cell in relation to its efficiency new approach

El-Adawi, M.K.; Al-Nuaim, I.A.

doi:10.1016/j.desal.2007.04.014

Cited by 25 publications

(16 citation statements)

References 11 publications

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“…In the normal states above T c , the open circuit voltage V oc decreases with temperature (top of Fig. 3b), similar to the linear behavior of V oc for normal solar cells based on p-n junctions313233. Although the change rate of V oc with temperature (− dV oc /dT ), which depends strongly on laser intensity, is much smaller than that of normal solar cells, the temperature coefficient of V oc for YBCO-Ag junction has the same order of magnitude as that of the solar cells.…”

Section: Discussionsupporting

confidence: 72%

Origin of photovoltaic effect in superconducting YBa2Cu3O6.96 ceramics

Yang

Han

Chang

2015

Sci Rep

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We report remarkable photovoltaic effect in YBa2Cu3O6.96 (YBCO) ceramic between 50 and 300 K induced by blue-laser illumination, which is directly related to the superconductivity of YBCO and the YBCO-metallic electrode interface. There is a polarity reversal for the open circuit voltage Voc and short circuit current Isc when YBCO undergoes a transition from superconducting to resistive state. We show that there exists an electrical potential across the superconductor-normal metal interface, which provides the separation force for the photo-induced electron-hole pairs. This interface potential directs from YBCO to the metal electrode when YBCO is superconducting and switches to the opposite direction when YBCO becomes nonsuperconducting. The origin of the potential may be readily associated with the proximity effect at metal-superconductor interface when YBCO is superconducting and its value is estimated to be ~10–8 mV at 50 K with a laser intensity of 502 mW/cm2. Combination of a p-type material YBCO at normal state with an n-type material Ag-paste forms a quasi-pn junction which is responsible for the photovoltaic behavior of YBCO ceramics at high temperatures. Our findings may pave the way to new applications of photon-electronic devices and shed further light on the proximity effect at the superconductor-metal interface.

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Section: Discussionsupporting

confidence: 72%

Origin of photovoltaic effect in superconducting YBa2Cu3O6.96 ceramics

Yang

Han

Chang

2015

Sci Rep

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“…while according to (2), Fig. 4 shows the comparison between the measured and by the proposed method predicted values of the direct I b,h and diffuse I d,h solar radiation on a horizontal surface.…”

Section: B Prediction Of Solar Radiationmentioning

confidence: 99%

“…An overview of the solar cell technologies and their efficiencies are presented in [1], while the impact of the solar cell temperature on the energy conversion efficiency is discussed in [2]. When the solar cell technology, solar cell temperature and the solar radiation that reach the solar cell surface are given, the efficiency of energy conversion in the solar cells connected in the PV modules depends primarily on the impedance matching.…”

mentioning

confidence: 99%

Maximum Efficiency Trajectories of a Two-Axis Sun Tracking System Determined Considering Tracking System Consumption

Seme

Štumberger

Vorsic

2011

IEEE Trans. Power Electron.

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This paper deals with the two-axis sun tracking system for a photovoltaic system. The trajectories of the sun tracking system are determined in an optimization procedure. The optimization goal is maximization of an electric energy production in the photovoltaic system considering the tracking system consumption. Determination of the tilt angle and azimuth angle trajectories is described as a nonlinear and bounded optimization problem, where the objective function is not available in the explicit form. A stochastic search algorithm called Differential Evolution is used as an optimization tool. In the optimization procedure, the objective function is evaluated by using the models of available solar radiation, tracking system consumption, and the efficiency of solar cells with the appropriate dc/dc converters. The problem bounds are given in the form of lower and upper bounds for both angles and time and angle quantization. The results presented in the paper show, that the optimal trajectories for the tilt and azimuth angle depend on the available solar radiation, solar cell efficiency, tracking system consumption and the optimization bounds.

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“…To measure irradiance R (W/m 2 ), small, high-efficiency single-crystal silicon cells with the dimensions 3.5 cm × 5.5 cm are used. This radiation sensor delivers an electric current Ip (mA) In addition, changes in external conditions (solar radiation, ambient temperature, and relative humidity) affect the temperature and in turn, temperature changes influence both the signal processing circuit and solar cell parameters [57] and, thus, reduce the accuracy of the irradiation measurement [58]. The most important factor is temperature dependence [47] and, therefore, the thermal effects must be considered when selecting and testing the components used for the device, due to outdoor use of the sensor.…”

Section: Devicesmentioning

confidence: 99%

Modeling and Experimental Validation of a Low-Cost Radiation Sensor Based on the Photovoltaic Effect for Building Applications

et al. 2016

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Abstract:The energy consumed to cool buildings is very elevated and solar gains represent a high percentage of these cooling loads. To minimize the thermal load it is necessary to control external shading systems. This control requires continuous measurement of solar radiation in different locations of the building. However, for such applications the use of conventional irradiance sensors increases the cost and reduces the profitability of the installation. This paper is focused on the development, modeling, and experimental validation of low cost irradiation sensors based on photovoltaic effect in order to reduce the costs of dynamic external shading devices and to improve the profitability of the system. With this proposal, firstly, small commercial photovoltaic cells have been adapted for use as an irradiation measurement device. Subsequently, quasi-stationary and continuous experimental measurements of these silicon cells, facing south and installed horizontally, have been carried out in Jaén (Spain) in 2009 and 2010. Finally, a nonlinear multiparameter function has been developed to evaluate the irradiance using the electric current generated by the cell, cell temperature, ambient temperature, and absolute humidity. A favorable agreement between the model predictions and experimental data has been observed with a coefficient of determination around 0.996 for all cells.

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The temperature functional dependence of VOC for a solar cell in relation to its efficiency new approach

Cited by 25 publications

References 11 publications

Origin of photovoltaic effect in superconducting YBa2Cu3O6.96 ceramics

Origin of photovoltaic effect in superconducting YBa2Cu3O6.96 ceramics

Maximum Efficiency Trajectories of a Two-Axis Sun Tracking System Determined Considering Tracking System Consumption

Modeling and Experimental Validation of a Low-Cost Radiation Sensor Based on the Photovoltaic Effect for Building Applications

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