Frequency conversion in a-GaN/AlGaN Bragg-confined structures for applications for solar cells
Solar cells are unable to absorb photons with energies lower than the constituent material's band-gap, which eliminates a significant part of the spectrum. The efficiency of the process may be increased by converting low-energy photon pairs, via nonlinear optical effects, into photons optimal f...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Savez inženjera i tehničara Srbije
2014-01-01
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| Series: | Tehnika |
| Subjects: | |
| Online Access: | http://scindeks-clanci.ceon.rs/data/pdf/0040-2176/2014/0040-21761403377C.pdf |
| Summary: | Solar cells are unable to absorb photons with energies lower than the constituent material's band-gap, which eliminates a significant part of the spectrum. The efficiency of the process may be increased by converting low-energy photon pairs, via nonlinear optical effects, into photons optimal for the solar cell. The converter structures consist of GaN/AlGaN super lattice series perturbed by asymmetric quantum wells which form the Bragg confined structures (BSCs). BCSs support additional bound electron states in the super lattice minigaps, including states above the barrier. Parameters of the structure are optimized for each photon pair, by using the genetic algorithm, to obtain a continual converter. |
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| ISSN: | 0040-2176 2560-3086 |