scholarly journals Experimental evidence of hot carriers solar cell operation in multi-quantum wells heterostructures

2015 ◽  
Vol 106 (18) ◽  
pp. 183901 ◽  
Author(s):  
Jean Rodière ◽  
Laurent Lombez ◽  
Alain Le Corre ◽  
Olivier Durand ◽  
Jean-François Guillemoles
Keyword(s):  
Solar Cell ◽  
Quantum Wells ◽  
Experimental Evidence ◽  
Hot Carriers

scholarly journals Experimental evidence of exciton wavefunction shrinkage in InxGa1-xAs/InP multi quantum wells

1993 ◽  
Vol 03 (C5) ◽  
pp. 315-318
Author(s):  
B. ROTELLI ◽  
C. ARENA ◽  
L. TARRICONE ◽  
C. RIGO
Keyword(s):  
Quantum Wells ◽  
Experimental Evidence

Quantum-Well Solar Cells

MRS Bulletin ◽  
1993 ◽  
Vol 18 (10) ◽  
pp. 51-55 ◽  
Author(s):  
Keith Barnham ◽  
Jenny Barnes ◽  
Guido Haarpaintner ◽  
Jenny Nelson ◽  
Mark Paxman ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Quantum Well ◽  
Quantum Wells ◽  
Forward Bias ◽  
Flat Band ◽  
Output Current ◽  
Novel Approach ◽  
Modulator Structure ◽  
Conventional Cell

The best present-day single-bandgap solar cells have efficiencies around 20–25%. However, the Carnot efficiency of the earth-sun system is 95%, so there is considerable potential for improvement. The fundamental efficiency limitation in a conventional solar cell results from the tradeoff between a low bandgap which maximizes light absorption and hence output current and a high bandgap which maximizes output voltage. As a result, the maximum theoretical efficiency of a conventional solar cell is around 30% in unconcentrated sunlight at a bandgap close to that of GaAs.The quantum-well solar cell is a novel approach to higher efficiency. In its simplest form, shown in Figure 1, it consists of a multiquantum-well (MQW) system in the undoped region of a p-i-n solar cell. For light with energy greater than the band-gap Eg, the quantum-well cell behaves like a conventional cell. However, light with energy below Eg can be absorbed in the quantum wells. Our studies show that if the material quality is good, the electrons and holes escape from the wells and contribute to a higher output current at a voltage between that of the barrier and well material. In AlGaAs/GaAs test devices, we have obtained efficiency enhancements of a factor of more than two when cells with quantum wells are compared with identical cells without wells.The structure in Figure 1 is, of course, essentially similar to the MQW photodiode or modulator structure that operates in reverse bias, and the quantum-well laser that operates in forward bias beyond flat band.

Hot Carriers in Quantum Wells for Photovoltaic Efficiency Enhancement

2014 ◽  
Vol 4 (1) ◽  
pp. 244-252 ◽  
Author(s):  
Louise C. Hirst ◽  
Hiromasa Fujii ◽  
Yunpeng Wang ◽  
Masakazu Sugiyama ◽  
Nicholas J. Ekins-Daukes
Keyword(s):  
Quantum Wells ◽  
Efficiency Enhancement ◽  
Hot Carriers ◽  
Photovoltaic Efficiency

Potentially modulated multi-quantum wells for high-efficiency solar cell applications

2005 ◽  
Vol 85 (2) ◽  
pp. 143-152 ◽  
Author(s):  
Yoshitaka Okada ◽  
Naoyuki Shiotsuka ◽  
Toru Takeda
Keyword(s):  
Solar Cell ◽  
Quantum Wells ◽  
High Efficiency

Intersubband relaxation of photoexcited hot carriers in quantum wells

1988 ◽  
Vol 31 (3-4) ◽  
pp. 413-418 ◽  
Author(s):  
D.Y. Oberli ◽  
D.R. Wake ◽  
M.V. Klein ◽  
T. Henderson ◽  
H. Morkoç
Keyword(s):  
Quantum Wells ◽  
Hot Carriers ◽  
Intersubband Relaxation

scholarly journals A III-nitride nanowire solar cell fabricated using a hybrid coaxial and uniaxial InGaN/GaN multi quantum well nanostructure

RSC Advances ◽  
2018 ◽  
Vol 8 (37) ◽  
pp. 20585-20592 ◽  
Author(s):  
Ji-Hyeon Park ◽  
R. Nandi ◽  
Jae-Kwan Sim ◽  
Dae-Young Um ◽  
San Kang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Quantum Well ◽  
Quantum Wells ◽  
Cap Layer ◽  
Multi Quantum Well

Solar cells fabricated with hybrid nanowires comprising InGaN/GaN uniaxial and coaxial multi-quantum wells with an InGaN nano-cap layer.

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