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An optical model for predicting the quantum efficiency of solar modules
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AN OPTICAL MODEL FOR PREDICTING THE QUANTUM EFFICIENCY OF SOLAR
MODULES
ABSTRACT:
The fact that a solar cell will be encapsulated in a solar module has a strong impact on how its
optical properties should be characterized, designed, and optimized. In this paper, we present a
ray-tracingmodel that is capable of calculating the optical properties of a solar cell with a random
pyramidal texture both with and without encapsulation and for the light at any angle of
incidence.We introduce a simple method wherein we combine ray tracing and external quantum
efficiency (EQE) measurements of a solar cell to predict the EQE after encapsulation for any
choice of encapsulation materials and antireflection coatings. We verify the quality of our EQE-prediction
toward experimental data and find good agreement.We apply this approach and
compare the influence of different encapsulation materials on the module performance and
perform a full loss analysis at a few selected angles of incidence. Finally, we use the ray-tracing
model to map generation current for all angles of incidence relevant for a pyramidal texture both
with and without encapsulation.
