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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

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Spectral dependence of amorphous silicon photovoltaic device performance

Infield, D.G. (2004) Spectral dependence of amorphous silicon photovoltaic device performance. International Journal of Ambient Energy, 25 (1). pp. 26-32. ISSN 0143-0750

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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.