Capacitance effects in high-efficiency cells

Friesen, Gabi; Ossenbrink, H.

doi:10.1016/s0927-0248(97)00072-x

Cited by 59 publications

(30 citation statements)

References 2 publications

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“…A diffusion capacitance can be expressed by the diode current ID and the time constant TF, the saturation current IS, the acceptor concentration NA, and the biasing voltage U [14].…”

Section: Fundamentalsmentioning

confidence: 99%

Capacitance Evolution of Photovoltaic Solar Modules Under the Influence of Electrical Stress

Zaraket¹,

Aillerie²,

Salame³

2015

Energy Procedia

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The main purpose of this work was to study the effect of electric currents reverse stress on the capacitance and in general the performance of photovoltaic modules. Different levels of reverse stress current are injected into the solar cell structure and the C-V characteristic are measured in the dark and illuminated conditions, at room temperature for several common periods of time. A digital double exponential model was used to analyze the experimental measurements. The dramatic changes in capacitance characteristics are caused from the effect of a reverse current introduced for different stress levels, simulated the effect of accumulated extreme reverse currents that can occur in the solar cells and modules for different reasons. The paper contributes to research on the adverse effects of reverse currents on the capacitance and normal functioning of cells and solar modules.

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“…A diffusion capacitance can be expressed by the diode current ID and the time constant TF, the saturation current IS, the acceptor concentration NA, and the biasing voltage U [14].…”

Section: Fundamentalsmentioning

confidence: 99%

Capacitance Evolution of Photovoltaic Solar Modules Under the Influence of Electrical Stress

Zaraket¹,

Aillerie²,

Salame³

2015

Energy Procedia

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“…The LEDs lights add an AC component in both top and middle subcell photocurrents (see figure 2), but only the AC current of the limiting subcell will show up in the overall current of the MJ cell. silicon ones [6,7]. The voltage at which the MJ cell is biased and the frequencies of the modulated light coming from the LEDs are also very related with this dynamic behavior.…”

Section: Preliminary Resultsmentioning

confidence: 99%

On-site measurement of limiting subcell in multijunction solar devices

Muñoz-Cerón¹,

Miñano²,

Benı́tez³

et al. 2012

AIP Conference Proceedings

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Abstract.It is well known that the response of any photovoltaic solar cell is dependent on the spectral characteristics of the incident radiation. This dependency is crucial in the output characteristics of a multijunction (MJ) cell where the spectral composition of the radiation determines the overall photocurrent produced, as either the top or the middle subcell will be limiting its response. The current mismatching between top and middle subcell is translated into energy losses, affecting the yield of the system. For research and commercial purposes it is interesting to measure accurately the incident solar radiation on a MJ cell, in terms of its spectral composition. This measurement will allows us to determine the photocurrent generated in each band of the multijunction device. Nowadays, the only way of measuring the photocurrent generated by each subcell is done with isotype cells or with spectroradiometers but there is no device capable of directly measuring each subcell photocurrent. In this paper it is described a device based on a commercial multijunction solar cell that is capable of measuring the direct irradiance for the top and middle bands thus it offers information of the limiting subcell (top or middle) in outdoors conditions.

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“…It is well known that high efficiency photovoltaic modules usually exhibit large internal capacitance and that this can cause errors in the measured power output if the voltage is changed too quickly during a measurement [1]. This causes the measurement time required to measure high efficiency modules to be much longer than for the technologies of the last decades.…”

Section: Introductionmentioning

confidence: 99%