DocumentCode :
413499
Title :
High external quantum efficiency from double heterostructure layers as selective emitters in thermophotonic systems
Author :
Lin, Kuolung ; Catchpole, Kylie R. ; Trupke, Thorsten ; Campbell, Patrick ; Green, Martin A. ; Aberle, Armin G. ; Corkish, Richard ; Bett, Andreas W. ; Dimroth, Frank
Author_Institution :
Centre of Excellence for Adv. Silicon Photovoltaics & photonics, New South Wales Univ., Sydney, NSW, Australia
Volume :
1
fYear :
2003
fDate :
18-18 May 2003
Firstpage :
59
Abstract :
One of the main disadvantages of thermophotovoltaics is the need for a highly perfect selective emitter or filter to achieve high conversion efficiency. Thermophotonics overcomes this through the use of a heated light emitting diode as an extremely selective emitter. To achieve net conversion of heat to electricity with thermophotonics, a LED with high external quantum efficiency is required. As the initial step to demonstrate this concept, an AlGaAs/GaAs double heterostructure was optically pumped with energy higher than bandgap at room temperature. An EQE of 80% was measured for a doped planar sample on a transparent substrate. To the authors´ knowledge this is the highest EQE for a planar structure ever reported. The results for undoped samples agree well with independent thermal measurements and with simulation data from our photon ray-tracing model. The low surface recombination velocity implies that the sample quality is excellent.
Keywords :
III-V semiconductors; aluminium compounds; energy gap; gallium arsenide; gallium compounds; light emitting diodes; semiconductor heterojunctions; surface recombination; thermoelectricity; thermophotovoltaic cells; 20 degC; 80 percent; AlGaAs-GaAs; bandgap; conversion efficiency; double heterostructure layer; external quantum efficiency; filter; heated light emitting diode; photon ray-tracing model; room temperature; selective emitter; surface recombination velocity; thermophotonic system; thermophotovoltaics;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Photovoltaic Energy Conversion, 2003. Proceedings of 3rd World Conference on
Conference_Location :
Osaka, Japan
Print_ISBN :
4-9901816-0-3
Type :
conf
Filename :
1305219
Link To Document :
بازگشت