InGaSb Defect Filter Layer to Improve Performance of GaSb Solar Cells Grown on GaAs Substrates
Journal Article
·
· Journal of Electronic Materials
- Univ. of New Mexico, Albuquerque, NM (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
The reduction of the threading dislocation density in metamorphic GaSb grown on GaAs substrates through the use of InGaSb defect filter layers has been investigated. More specifically, we study the effects of strain and thickness on the ability of a InGaSb defect filter layer to reduce threading dislocations in GaSb solar cells grown on GaAs substrates. The strain between the GaSb metamorphic layer on GaAs substrate (99.5% relaxed) and the InGaSb defect filter layer is varied by changing the indium composition in the InGaSb layer. Here, it is demonstrated that an InGaSb defect filter layer with 0.6% strain is more effective for blocking threading dislocations compared with higher-strain layers, resulting in improved short-circuit current (Jsc) and open-circuit voltage (Voc) for the metamorphic GaSb solar cell. The optimization of the defect filter layer involves varying the thickness of the layer to achieve the lowest possible threading dislocation density. This also takes into account the critical thickness of the InGaSb layer on GaSb to avoid generation of threading dislocations from the InGaSb layer itself. It is shown that adding an In0.11Ga0.89Sb defect filter layer with thickness of 250 nm and 0.6% strain beneath a GaSb solar cell grown on a GaAs substrate improves Voc from 0.1 V to 0.16 V and Jsc from 19.7 mA/cm2 to 24.7 mA/cm2.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies (CINT)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1760369
- Report Number(s):
- SAND--2020-13825J; 692979
- Journal Information:
- Journal of Electronic Materials, Journal Name: Journal of Electronic Materials Journal Issue: 12 Vol. 49; ISSN 0361-5235
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Study of a 1 eV GaNAsSb photovoltaic cell grown on a silicon substrate
Vapor-grown InGaP/GaAs solar cells
Ultra-thin GaAs single-junction solar cells integrated with a reflective back scattering layer
Journal Article
·
Mon Mar 10 00:00:00 EDT 2014
· Applied Physics Letters
·
OSTI ID:22257066
Vapor-grown InGaP/GaAs solar cells
Journal Article
·
Sun Oct 01 00:00:00 EDT 1978
· Appl. Phys. Lett.; (United States)
·
OSTI ID:6748495
Ultra-thin GaAs single-junction solar cells integrated with a reflective back scattering layer
Journal Article
·
Wed May 28 00:00:00 EDT 2014
· Journal of Applied Physics
·
OSTI ID:22304315