Reflectance/Transmittance (RT) Sphere for PV Cell Development
Spectral Evolution’s reflectance/transmittance (RT) sphere can be used to study and
test the optical properties of different photovoltaic (PV) cell designs and coatings with
our family of spectroradiometers.

PV cells convert sunlight to electricity. The first stage in this conversion is
absorbance of light in the useful spectral range. Different treatments are used to
increase film absorbance including antireflective coatings. The effectiveness of
different designs and treatments can be compared by measuring reflectance,
transmittance and absorption.

To see the effect of sunlight striking a PV cell and compare the effects of different
materials, textures, and coatings, a spectroradiometer with an RT sphere that can
measure reflectance, transmittance, and absorption becomes indispensable.

Spectral Evolution spectroradiometers cover the full UV/VIS/NIR range from 350-
2500nm. An RT sphere allows you to collect all diffuse light reflected from a sample
since the inside of the sphere is a perfect reflecting diffuser—total hemispherical
reflectance can be measured. With the high resolution spectra obtained from a
Spectral Evolution spectroradiometer, the RT sphere can deliver detailed information
about the PV cell’s spectral features.

The RT sphere can be connected to
any of our portable spectroradiometers,
including the
SR-4500 which features
three thermoelectrically-cooled
photodiode arrays for the ultimate in
stable performance.
 First in Full Range PDA Spectrometer, Spectroradiometer and Spectrophotometer Systems
 First in Full Range PDA Spectrometer, Spectroradiometer and Spectrophotometer Systems
1 Canal Street  ◊  Unit B1
Lawrence, MA 01840  USA
Tel: 978 687-1833  ◊  Fax: 978 945-0372

Copyright © 2012 Spectral Evolution, Inc
Our RT Sphere works with our high resolution,
portable NIR spectroradiometers to measure
reflectance, transmittance, and absorption. It is
lightweight and portable for use anywhere.