Lifetime enhancement for multiphoton absorption in intermediate band solar cells
| Autor: | Nelson Studart, Anibal Thiago Bezerra |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Photon
Materials science Acoustics and Ultrasonics Ratchet 02 engineering and technology Rate equation Photoelectric effect Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Molecular physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention law Scattering rate Excited state 0103 physical sciences Solar cell 010306 general physics 0210 nano-technology Quantum well |
| Zdroj: | Journal of Physics D: Applied Physics. 50:305501 |
| ISSN: | 1361-6463 0022-3727 |
| DOI: | 10.1088/1361-6463/aa795a |
| Popis: | A semiconductor structure consisting of two coupled quantum wells embedded into the intrinsic region of a p–i–n junction is proposed as an intermediate band solar cell with a photon ratchet state, which would lead to increasing the cell efficiency. The conduction subband of the right-hand side quantum well works as the intermediated band, whereas the excited conduction subband of the left-hand side quantum well operates as the ratchet state. The photoelectrons in the intermediate band are scattered through the thin wells barrier and accumulated into the ratchet subband. A rate equation model for describing the charge transport properties is presented. The efficiency of the current generation is analyzed by studying the occupation of the wells subbands, taking into account the charge dynamic behavior provided by the electrical contacts connected to the cell. The current generation efficiency depends essentially from the relations between the generation, recombination rates and the scattering rate to the ratchet state. The inclusion of the ratchet states led to both an increase and a decrease in the cell current depending on the transition rates. This suggests that the coupling between the intermediate band and the ratchet state is a key point in developing an efficient solar cell. |
| Databáze: | OpenAIRE |
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