@inproceedings{0a68476947084a1192a716627830e805,
title = "Freeform surface relief diffractive optic for photovoltaic spectrum splitting",
abstract = "A surface relief diffractive optical element (DOE) for photovoltaic (PV) spectrum splitting is fabricated and tested. The optic is designed using a modified Gerchberg-Saxton algorithm. The module consists of a DOE followed by a 3.3 cm focal length lens. Alternating side-by-side PV cells - Indium Gallium Phosphide and Silicon - are placed at the collection plane. The DOE is fabricated in photopolymer using grayscale lithography. Optical efficiency and spectral distribution are measured with a scanning spectrometer. Two-bandgap conversion efficiency of 25.4\% is achieved using the fabricated DOE. Simulations show that 28.4\% conversion efficiency is possible with this type of optical element, which approaches the maximum possible conversion efficiency of the two-cell combination used (32.4\%).",
keywords = "Gerchberg-Saxton algorithm, diffractive optical element, grayscale lithography, spectrum splitting",
author = "Vorndran, \{Shelby D.\} and Silvana Ayala and Yuechen Wu and Russo, \{Juan M.\} and Zaverton, \{Melissa A.\} and Tom Milster and Kostuk, \{Raymond K.\}",
note = "Publisher Copyright: {\textcopyright} 2015 IEEE.; 42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 ; Conference date: 14-06-2015 Through 19-06-2015",
year = "2015",
month = dec,
day = "14",
doi = "10.1109/PVSC.2015.7356158",
language = "English (US)",
series = "2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015",
}