Thermally assisted electroluminescence: A viable means to generate electricity from solar or waste heat?

Bauke Heeg, Jiang Bo Wang, Shane Johnson, Benjamin D. Buckner, Yong-Hang Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

It has been proposed recently that thermally assisted electroluminescence may in principle provide a means to convert solar or waste heat into electricity. The basic concept is to use an intermediate active emitter between a heat source and a photovoltaic (PV) cell. The active emitter would be a forward biased light emitting diode (LED) with a bias voltage, Vb below bandgap, Eg (i.e., qVb, < E g), such that the average emitted photon energy is larger than the average energy that is required to create charge carriers. The basic requirement for this conversion mechanism is that the emitter can act as an optical refrigerator. For this process to work and be efficient, however, several materials challenges will need to be addressed and overcome. Here, we outline a preliminary analysis of the efficiency and conversion power density as a function of temperature, bandgap energy and bias voltage, by considering realistic high temperature radiative and non-radiative rates as well as radiative heat loss in the absorber/emitter. From this analysis, it appears that both the overall efficiency and net generated power increase with increasing bandgap energy and increasing temperature, at least for temperatures up to 1000 K, despite the fact that the internal quantum yield for radiative recombination decreases with increasing temperature. On the other hand, the escape efficiency is a crucial design parameter which needs to be optimized.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6461
DOIs
StatePublished - 2007
EventLaser Cooling of Solids - San Jose, CA, United States
Duration: Jan 24 2007Jan 25 2007

Other

OtherLaser Cooling of Solids
CountryUnited States
CitySan Jose, CA
Period1/24/071/25/07

Fingerprint

waste heat
Waste heat
Electroluminescence
electricity
electroluminescence
emitters
Electricity
heat
Energy gap
Bias voltage
Temperature
temperature
energy
photovoltaic cells
refrigerators
electric potential
radiative recombination
heat sources
Photovoltaic cells
Refrigerators

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Heeg, B., Wang, J. B., Johnson, S., Buckner, B. D., & Zhang, Y-H. (2007). Thermally assisted electroluminescence: A viable means to generate electricity from solar or waste heat? In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 6461). [64610K] https://doi.org/10.1117/12.708233

Thermally assisted electroluminescence : A viable means to generate electricity from solar or waste heat? / Heeg, Bauke; Wang, Jiang Bo; Johnson, Shane; Buckner, Benjamin D.; Zhang, Yong-Hang.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6461 2007. 64610K.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Heeg, B, Wang, JB, Johnson, S, Buckner, BD & Zhang, Y-H 2007, Thermally assisted electroluminescence: A viable means to generate electricity from solar or waste heat? in Proceedings of SPIE - The International Society for Optical Engineering. vol. 6461, 64610K, Laser Cooling of Solids, San Jose, CA, United States, 1/24/07. https://doi.org/10.1117/12.708233
Heeg B, Wang JB, Johnson S, Buckner BD, Zhang Y-H. Thermally assisted electroluminescence: A viable means to generate electricity from solar or waste heat? In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6461. 2007. 64610K https://doi.org/10.1117/12.708233
Heeg, Bauke ; Wang, Jiang Bo ; Johnson, Shane ; Buckner, Benjamin D. ; Zhang, Yong-Hang. / Thermally assisted electroluminescence : A viable means to generate electricity from solar or waste heat?. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6461 2007.
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