We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Capping vertically aligned InGaAs/GaAs(Sb) quantum dots with a AlGaAsSb spacer layer in intermediate-band solar cell devices.
- Authors
Liu, Wei‐Sheng; Lin, Hsiao‐Chien; Liu, Ren‐Yo
- Abstract
This study demonstrated the feasibility of fabricating a highly stacked vertically aligned InGaAs/GaAs(Sb) quantum dot (QD) structure with an AlGaAsSb spacer layer for improving the device performance of QD intermediate-band solar cell (QD-IBSC) devices. The power-dependent photoluminescence measurements of the proposed structure revealed a blueshift in the QD ground-state emissions when the excitation power was increased, indicating the formation of an intermediate band inside the QD structure. Capping the InGaAs QDs with a GaAsSb layer prevented the QDs from collapsing because there was less In-Ga intermixing between the QDs and GaAsSb layer. In addition to maintaining the QD structure, the carrier lifetime was extended by tuning the energy band alignment of the InGaAs/GaAsSb QD structure. Inserting the AlGaAsSb layer into the spacer layer increased the band gap, which in turn increased the open-circuit voltage of the QD-IBSC. The QD-IBSC in this work shows an extension of external-quantum efficiency by up to 1200 nm (compared with a GaAs reference cell) through the absorption by QDs and increased the open-circuit voltage from 0.67 to 0.70 V by adopting the AlGaAsSb spacer layer. These results confirm that adopting a columnar InGaAs/GaAs(Sb) QD structure with a AlGaAsSb spacer layer can enhance the performance of QD-IBSC devices. Copyright © 2016 John Wiley & Sons, Ltd.
- Subjects
QUANTUM dot devices; SOLAR cells; OPTOELECTRONIC device performance; SOLAR cell efficiency; ANTIMONY
- Publication
Progress in Photovoltaics, 2017, Vol 25, Issue 1, p76
- ISSN
1062-7995
- Publication type
Article
- DOI
10.1002/pip.2815