posted on 10.06.2019, 00:00by Youngjoon Hong, Matthew Otten, Misun Min, Stephen K. Gray, David P. Nicholls
In this letter we consider the question of designing insulator/metal thermovoltaic structures with periodically corrugated interfaces that give optimal performance based on the metric of useful power density. Using a Monte Carlo approach in a robust, rapid, and high-accuracy numerical simulation strategy, we have identified such interface shapes. We searched among the class of sinusoids and found that a flat-interface configuration could be significantly improved in transverse magnetic polarization. More specifically, we found that (i.) the performance improves with increasing corrugation amplitude (ii.) up to a maximum, (iii.) the shape of the corrugation is largely irrelevant, and (iv.) the period of the corrugation should be chosen in connection to the bandgap energy of the photovoltaic cell. For the latter we provide a simple expression as a starting point for practitioners interested in fabricating such structures.
We thank J. Foley for helpful discussions. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Advanced Scientific Computing Research, un- der Contract DE-AC02-06CH11357, and the National Science Foundation through grant No. DMS-1522548 (D.P.N.). Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02- 06CH11357.
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Hong, Y., Otten, M., Min, M., Gray, S. K., & Nicholls, D. P. (2019). Periodic corrugations to increase efficiency of thermophotovoltaic emitting structures. Applied Physics Letters, 114(5). and may be found at doi:10.1063/1.5080548.
Hong, Y., Otten, M., Min, M., Gray, S. K., & Nicholls, D. P. (2019). Periodic corrugations to increase efficiency of thermophotovoltaic emitting structures. Applied Physics Letters, 114(5). doi:10.1063/1.5080548