InGaAs/GaAs QD Superlattices: MOVPE Growth, Structural and Optical Characterization, and Application in Intermediate-Band Solar Cells

Conference · Tue Feb 01 00:00:00 EST 2005

DOI:https://doi.org/10.1109/PVSC.2005.1488065· OSTI ID:15016460

Norman, A G; Hanna, M C; Dippo, P; Levi, D H; Reedy, R C; Ward, J S; Al-Jassim, M M

We report on the growth and characterization of InGaAs/GaAs quantum dot (QD) superlattices for application in intermediate-band solar cells (IBSCs). Good optical and structural quality QD superlattices with up to 50 periods were obtained by metal-organic vapor-phase epitaxy (MOVPE) growth on {l_brace}113{r_brace}B GaAs substrates. Solar cells containing Si {partial_derivative}-doped and undoped QD superlattice absorption regions have been fabricated and their performance compared with control cells containing undoped GaAs or undoped InGaAs/GaAs superlattice absorption regions. The QD superlattice cells exhibited photoresponses extended to longer wavelengths than the control cells. The introduction of QDs to the absorbing region of the solar cells resulted in a decrease in the open-circuit voltages and, in some cases, a decrease in the short-circuit currents of the cells.

• Research Organization: National Renewable Energy Lab. (NREL), Golden, CO (United States)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC36-99-GO10337
• OSTI ID: 15016460
• Report Number(s): NREL/CP-520-37405; TRN: US200513%%457
• Resource Relation: Conference: Prepared for the 31st IEEE Photovoltaics Specialists Conference and Exhibition, Lake Buena Vista, FL (US), 01/03/2005--01/07/2005; Other Information: PBD: 1 Feb 2005
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
36 MATERIALS SCIENCE
ABSORPTION
EPITAXY
PERFORMANCE
QUANTUM DOTS
SOLAR CELLS
SUBSTRATES
SUPERLATTICES
WAVELENGTHS
SOLAR ENERGY
PV
GROWTH AND CHARACTERIZATION
QUANTUM DOT (QD)
INTERMEDIATE-BAND SOLAR CELLS (IBSCS)
METAL-ORGANIC VAPOR-PHASE EPITAXY (MOVPE)
PHOTORESPONSES
OPEN-CIRCUIT VOLTAGES
SOLAR ENERGY - PHOTOVOLTAICS