Optical Characterization of thin Film Solar Cells
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Date
1996-06
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Addis Ababa University
Abstract
The optical propenies of glow discharge ( GO ) produced p-. i-. and n- layers
of hydrogenated amorphous Silicon a - Si : H. thin films have been investigated
over a wide photon energy range 1.24 eV < E < 3.54 eV using room temperature
reflectance ( R ) and transmittance ( T) measurements. The data is compared
with room temperature Rand T measurements done on the same samples in the
laboratory of lSI - PV in Forschungszentrum, Jue/ich. Germany over an energy
range of 1. 13 eV < E < 4. 13 eV. The similarities and dffferences between
individual Rand T measurements done in the two laboratories and optical
functions deduced from the measurements are discussed. A common value for
the optical energy gap within the va lue ( up to .:': 0.04 eV) is obtained. As a solar
cell component. the investigated sample p- layer does not harvest effectively
photons from the visible sunlight energy spectrum. The possibility of the
measurement of optical constants in the Addis Ababa University Department of
Physics is verified for the first time.
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Keywords
Optical Characterization