Title |
Control of hot-carrier relaxation for realizing ideal quantum-dot intermediate-band solar cells
|
---|---|
Published in |
Scientific Reports, February 2014
|
DOI | 10.1038/srep04125 |
Pubmed ID | |
Authors |
David M. Tex, Itaru Kamiya, Yoshihiko Kanemitsu |
Abstract |
For intermediate-band solar cells, the broad absorption spectrum of quantum dots (QDs) offers a favorable conversion efficiency, and photocurrent generation via efficient two-step two-photon-absorption (TS-TPA) in QDs is essential for realizing high-performance solar cells. In the last decade, many works were dedicated to improve the TS-TPA efficiency by modifying the QD itself, however, the obtained results are far from the requirements for practical applications. To reveal the mechanisms behind the low TS-TPA efficiency in QDs, we report here on two- and three-beam photocurrent measurements of InAs quantum structures embedded in AlGaAs. Comparison of two- and three-beam photocurrent spectra obtained by subbandgap excitation reveals that the QD TS-TPA efficiency is improved significantly by suppressing the relaxation of hot TS-TPA carriers to unoccupied shallow InAs quantum structure states. |
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