DocumentCode
3000770
Title
Voltage performance of quantum well solar cells in the Alx Ga1-xAs/GaAs and the GaAs/InyGa1-yAs material systems
Author
Haarpaintner, G. ; Barnes, J. ; Barnham, K.W.J. ; Connolly, J.P. ; Dosarajh, S.S. ; Nelson, J. ; Roberts, C. ; Button, C. ; Hili, Graham ; Pate, M.A. ; Roberts, J.S.
Author_Institution
Imperial Coll. of Sci., Technol. & Med., London, UK
Volume
2
fYear
1994
fDate
5-9 Dec 1994
Firstpage
1783
Abstract
The open circuit voltage Voc and reference voltage V ref defined as a measure of the dark current quality, have been studied for a large number of quantum well (QW) solar cells and homogenous control cells. Samples were grown in the AlxGa1-xAs/GaAs and GaAs/InyGa1-y As material systems. For both combinations, QW solar cells show a better voltage performance in Voc and Vref than one would expect from a single bandgap solar cell with the same effective absorption bandgap Ea. For the AlGaAs/GaAs cells, V oc is related to structural parameters of the QW cells such as the well width LW and the Al fraction x. For the strained GaAs/InGaAs cells a relationship is found between Vref and the barrier width LB, which is a dominant parameter in determining strain relaxation and defect formation at a fixed In fraction
Keywords
III-V semiconductors; aluminium compounds; crystal defects; deformation; gallium arsenide; indium compounds; relaxation; semiconductor quantum wells; solar cells; Al fraction; AlxGa1-xAs/GaAs solar cells; AlGaAs-GaAs; GaAs-InGaAs; GaAs/InyGa1-yAs solar cells; In fraction; absorption bandgap; barrier width; dark current quality; defect formation; homogenous control cells; open circuit voltage; quantum well solar cells; quantum well width; reference voltage; strain relaxation; strained GaAs/InGaAs cells; structural parameters; voltage performance; Absorption; Circuits; Current measurement; Dark current; Gallium arsenide; Indium gallium arsenide; Photonic band gap; Photovoltaic cells; Structural engineering; Voltage control;
fLanguage
English
Publisher
ieee
Conference_Titel
Photovoltaic Energy Conversion, 1994., Conference Record of the Twenty Fourth. IEEE Photovoltaic Specialists Conference - 1994, 1994 IEEE First World Conference on
Conference_Location
Waikoloa, HI
Print_ISBN
0-7803-1460-3
Type
conf
DOI
10.1109/WCPEC.1994.520648
Filename
520648
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