@inproceedings{aca6e99ed33f464abd7de8f32abcc08f,
title = "Enhanced Internal Reflectance of Emission in Solar Cells with Angle- And Energy-selective Reflectors",
abstract = "The open-circuit voltage of solar cells benefits from highly internally reflective surfaces on the front and rear of the cells that restrict radiative recombination current losses and lead to maximum device efficiency. While the back reflector reflects emitted photons broadly, an energy-selective front reflector is tailored to reflect photons with energies below the designed energy and can be energetically situated just above the solar cell absorber bandgap. Devices with an energy of restriction E_{R} > E_{g} show a maximum VOC analogous to blue-shifting the absorption and emission spectra to that of a solar cell with a bandgap E_{g}=E_{R}. Devices that incorporate both angle- and energy-selectivity benefit from reduced radiative recombination current losses due to etendue expansion loss reduction and reduced blackbody emission absorption, respectively. Resulting VOC gains of several hundred meV are expected for low-bandgap solar cells, corresponding with up to 15% absolute efficiency increase for \mathrm{E}_{g} < 0.70\ \mathrm{eV} and E_{R} between 1.1 and 1.2 eV.",
keywords = "angle restriction, blackbody emission, dielectric stacks, front reflector, photon recycling",
author = "Chen, {Eric Y.} and Babcock, {Sean J.} and Irvin, {Nicholas P.} and King, {Richard R.}",
note = "Funding Information: This work is supported by the National Science Foundation (NSF) and U.S. Department of Energy (DOE) through the Quantum Energy for Sustainable Solar Technologies (QESST) Engineering Research Center (NSF EEC-1041895). Publisher Copyright: {\textcopyright} 2020 IEEE. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.; 47th IEEE Photovoltaic Specialists Conference, PVSC 2020 ; Conference date: 15-06-2020 Through 21-08-2020",
year = "2020",
month = jun,
day = "14",
doi = "10.1109/PVSC45281.2020.9300407",
language = "English (US)",
series = "Conference Record of the IEEE Photovoltaic Specialists Conference",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "2010--2016",
booktitle = "2020 47th IEEE Photovoltaic Specialists Conference, PVSC 2020",
}