Characterisation of a filter-based external quantum efficiency measurement system
conference contributionposted on 22.06.2009, 13:39 authored by Christopher J. Hibberd, Martin BlissMartin Bliss, H.M. Upadhyaya, Ralph Gottschalg
Accurate assessment of external quantum efficiency provides information useful for understanding where losses in energy conversion efficiency occur in solar cells. These systems are typically designed to measure small areas only, which makes it impossible to measure the quantum efficiency of monolithically integrated modules and thus any effects due to interconnection cannot be assessed. A system for measuring spectral response has been designed and recently commissioned at CREST with a view to making measurements on larger areas. The external quantum efficiency of solar cells is calculated based around a series of narrow-band interference filters and homogenising optical elements that are able to provide a large-area, homogeneous, monochromatic illumination. In this paper the initial characterisation of the system will be presented. It is the intention to further improve the functionality of the system over the coming year and the planned enhancements will be discussed in light of their effects on measurement accuracy, in particular for devices such as dye cells and multi-junction cells which have more complicated electro-optical characteristics than basic silicon wafer cells.
- Mechanical, Electrical and Manufacturing Engineering
- Centre for Renewable Energy Systems Technology (CREST)