Conclusion
The presented work is the effects of variation in solar spectrum on the performance of multicrystalline mc-Si module. The morning spectra have more infrared compared to the late afternoon spectra and this shift from VIS to IR has a small negative impact on the device parameters of the module. The spectral bands in the VIS region contribute more to ISC than the bands in the IR region. This is because the blue part of the spectrum enhances charge carrier collection at the emitter of the solar cell, which in turn depends upon the surface recombination velocity and the junction depth (usually close to the surface). Also, the long wavelength (red) response is, in part, determined by the minority carrier lifetime in the p-type region of the module. Infrared on the other hand contributes little to ISC due to incomplete absorption of the long wavelength photons whose energy is mostly given as heat to the PV module. The UV region contributes least to the ISC because most of the short wavelength photons are absorbed on the surface of the module before they generate charge carriers. The quantitative effect of the spectral variation on the performance of the PV module is shown on their respective device performance parameters. For mc-Si, most affected device parameter is Imax, and Pmax. The effect of the decrease in the VIS of the second spectra is not appreciably offset by the increase in IR, accounts for the decreased current collection and hence power of the module. It can therefore be concluded from this work that for a thorough understanding of the outdoor performance of mc-Si device spectral data are important.
บทสรุปThe presented work is the effects of variation in solar spectrum on the performance of multicrystalline mc-Si module. The morning spectra have more infrared compared to the late afternoon spectra and this shift from VIS to IR has a small negative impact on the device parameters of the module. The spectral bands in the VIS region contribute more to ISC than the bands in the IR region. This is because the blue part of the spectrum enhances charge carrier collection at the emitter of the solar cell, which in turn depends upon the surface recombination velocity and the junction depth (usually close to the surface). Also, the long wavelength (red) response is, in part, determined by the minority carrier lifetime in the p-type region of the module. Infrared on the other hand contributes little to ISC due to incomplete absorption of the long wavelength photons whose energy is mostly given as heat to the PV module. The UV region contributes least to the ISC because most of the short wavelength photons are absorbed on the surface of the module before they generate charge carriers. The quantitative effect of the spectral variation on the performance of the PV module is shown on their respective device performance parameters. For mc-Si, most affected device parameter is Imax, and Pmax. The effect of the decrease in the VIS of the second spectra is not appreciably offset by the increase in IR, accounts for the decreased current collection and hence power of the module. It can therefore be concluded from this work that for a thorough understanding of the outdoor performance of mc-Si device spectral data are important.
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