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Updated: Apr 28, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

Published on: July 18, 2015

Dish-based high concentration PV system with Köhler optics.

Blake M Coughenour, Thomas Stalcup, Brian Wheelwright

|June 13, 2014

Summary

This summary is machine-generated.

This study details a high concentration photovoltaic system using a paraboloidal mirror to power triple-junction cells. The novel XRX-Köhler optical design achieved 28% efficiency, with future systems projected to reach 32%.

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Area of Science:

Renewable Energy
Optical Engineering
Photovoltaics

Background:

High concentration photovoltaic (HCPV) systems require efficient optical designs for effective solar energy capture.
Traditional HCPV systems face challenges in uniform illumination and light distribution, impacting cell performance.

Purpose of the Study:

To develop and evaluate a novel XRX-Köhler optical system for high concentration photovoltaic applications.
To achieve uniform illumination, minimize optical losses, and ensure even light distribution for efficient series connection of photovoltaic cells.

Main Methods:

Design and construction of an XRX-Köhler optical system featuring a large primary paraboloidal mirror and secondary reflectors.
Utilizing a prototype with a 3.3m x 3.3m primary reflector and 36 actively cooled triple-junction cells.
Measurement of end-to-end system conversion efficiency under 1200x geometric concentration.

Main Results:

An operational prototype demonstrated a measured end-to-end system conversion efficiency of 28%.
The optical design provides high tolerance to mis-pointing and uniform illumination across cells.
Parasitic losses from active cooling were included in the efficiency measurement.

Conclusions:

The XRX-Köhler optical system is effective for high concentration photovoltaic applications.
The developed design methodology enables efficient series connection and uniform light distribution.
Projected efficiency of ~32% for future iterations indicates significant potential for improved solar energy conversion.