Spectral dependence of amorphous silicon photovoltaic device performance

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Abstract

The short circuit currents of a single, double and triple junction amorphous silicon (a-Si) device are investigated for changes with spectral irradiance variation. Two effects have been previously identified; (i) a primary spectral effect that depends purely on the availability of spectrally-useful irradiance within the absorption band of the device, and (ii) a secondary effect that depends also on the spectral distribution within this band. The average photon energy (APE) has been introduced as a useful parameter for describing spectra. It is a device-independent environmental parameter, which effectively puts a figure to the blueness of a spectrum and readily allows the analysis of spectral effects on photovoltaic devices. Single junction cells have a better performance as light becomes more blue-shifted. Double and triple junction cells have a performance that is maximised when the received spectrum is matched to the absorption profile and that decreases when the radiation is either red- or blue-shifted.
Original languageEnglish
Pages (from-to)26-32
Number of pages7
JournalInternational Journal of Ambient Energy
Volume25
Issue number1
DOIs
Publication statusPublished - 2004

Keywords

  • silicon photovoltaic device
  • photovoltaic
  • spectral dependence
  • spectral irradiance

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