Published June 2021
| public
Book Section - Chapter
Fundamental Photovoltaic Efficiency Limits Due to Semiconductor Band Tails
Chicago
Abstract
The theoretical maximum efficiency of a solar cell is given by the Shockley-Queisser limit, which assumes an abrupt onset of absorption near the band-edge. However, real materials always have an imperfect band-edge, which is usually characterized by an Urbach tail. By using optoelectronic reciprocity relations and explicitly accounting for band filling, we develop a modified detailed balance model that explicitly accounts for non-abrupt band-edges. We find that large band tails can result in an effective Stokes shift between the absorption onset and luminescence peak, which results in a penalty on the maximum efficiency of a solar cell.
Additional Information
© 2021 IEEE.Additional details
- Eprint ID
- 111811
- DOI
- 10.1109/pvsc43889.2021.9518548
- Resolver ID
- CaltechAUTHORS:20211109-230013535
- Created
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2021-11-11Created from EPrint's datestamp field
- Updated
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2021-11-11Created from EPrint's last_modified field