Developing The Performance of Double Quantum Dot Solar Cell Structure
This work proposes a double quantum dot (QD) structure as an intermediate band for developing solar (SC) performance. The density matrix (DEMs) are written for this system, where coupled with the continuity-current equation and solved numerically to obtain the quantum efficiency (QE). Through this m...
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| Format: | Article |
| Language: | English |
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University of Thi-Qar
2021-05-01
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| Series: | مجلة علوم ذي قار |
| Subjects: | |
| Online Access: | https://jsci.utq.edu.iq/index.php/main/article/view/793 |
| _version_ | 1797632413590880256 |
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| author | Suha Hadi Amin Habbeb Al-Khursan |
| author_facet | Suha Hadi Amin Habbeb Al-Khursan |
| author_sort | Suha Hadi |
| collection | DOAJ |
| description | This work proposes a double quantum dot (QD) structure as an intermediate band for developing solar (SC) performance. The density matrix (DEMs) are written for this system, where coupled with the continuity-current equation and solved numerically to obtain the quantum efficiency (QE). Through this modeling, the momentum matrix elements of QD-QD, QD-wetting layer (WL), and WL-barrier transitions are calculated and the orthogonalized plane wave is assumed for WL-QD. This type of formulation is used for the first time and covers more characteristics than the rate equation modeling by addressing the interaction between all the states. Results are simulated both the excitonic and nonexcitonic (electron-hole( eh)) cases and show the importance of adding the QD layer.
For the eh model, the band-to-band recombination rates are high for least energy difference. The barrier and WL band-to-band recombinations rates are reduced by more than two orders compared to QD rates. The valence band relaxations are of the same order and higher than corresponding conduction band rates. The relaxations between respective states have higher rates than band-to-band rates.
The discrimination between states is increased under the excitonic model due to increasing hole occupation. The recombination rates are reduced with this model while the QD band-to-band recombination rates are increased. In both models, reducing the QD-QD recombinations and increasing all other recombinations increases the QE. The high QD band-to-band rate increases QE. Note that in the excitonic model, smaller rates than in eh model is enough for high QE.
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| first_indexed | 2024-03-11T11:36:41Z |
| format | Article |
| id | doaj.art-779a72f2e6b340cfa6ef56db605d3f82 |
| institution | Directory Open Access Journal |
| issn | 1991-8690 2709-0256 |
| language | English |
| last_indexed | 2024-03-11T11:36:41Z |
| publishDate | 2021-05-01 |
| publisher | University of Thi-Qar |
| record_format | Article |
| series | مجلة علوم ذي قار |
| spelling | doaj.art-779a72f2e6b340cfa6ef56db605d3f822023-11-10T13:18:33ZengUniversity of Thi-Qarمجلة علوم ذي قار1991-86902709-02562021-05-0181Developing The Performance of Double Quantum Dot Solar Cell StructureSuha Hadi Amin Habbeb Al-KhursanThis work proposes a double quantum dot (QD) structure as an intermediate band for developing solar (SC) performance. The density matrix (DEMs) are written for this system, where coupled with the continuity-current equation and solved numerically to obtain the quantum efficiency (QE). Through this modeling, the momentum matrix elements of QD-QD, QD-wetting layer (WL), and WL-barrier transitions are calculated and the orthogonalized plane wave is assumed for WL-QD. This type of formulation is used for the first time and covers more characteristics than the rate equation modeling by addressing the interaction between all the states. Results are simulated both the excitonic and nonexcitonic (electron-hole( eh)) cases and show the importance of adding the QD layer. For the eh model, the band-to-band recombination rates are high for least energy difference. The barrier and WL band-to-band recombinations rates are reduced by more than two orders compared to QD rates. The valence band relaxations are of the same order and higher than corresponding conduction band rates. The relaxations between respective states have higher rates than band-to-band rates. The discrimination between states is increased under the excitonic model due to increasing hole occupation. The recombination rates are reduced with this model while the QD band-to-band recombination rates are increased. In both models, reducing the QD-QD recombinations and increasing all other recombinations increases the QE. The high QD band-to-band rate increases QE. Note that in the excitonic model, smaller rates than in eh model is enough for high QE. https://jsci.utq.edu.iq/index.php/main/article/view/793double quantum dot solar cell, electron-hole model, excitonic model, recombination rate, band-to-band, quantum efficiency. |
| spellingShingle | Suha Hadi Amin Habbeb Al-Khursan Developing The Performance of Double Quantum Dot Solar Cell Structure مجلة علوم ذي قار double quantum dot solar cell, electron-hole model, excitonic model, recombination rate, band-to-band, quantum efficiency. |
| title | Developing The Performance of Double Quantum Dot Solar Cell Structure |
| title_full | Developing The Performance of Double Quantum Dot Solar Cell Structure |
| title_fullStr | Developing The Performance of Double Quantum Dot Solar Cell Structure |
| title_full_unstemmed | Developing The Performance of Double Quantum Dot Solar Cell Structure |
| title_short | Developing The Performance of Double Quantum Dot Solar Cell Structure |
| title_sort | developing the performance of double quantum dot solar cell structure |
| topic | double quantum dot solar cell, electron-hole model, excitonic model, recombination rate, band-to-band, quantum efficiency. |
| url | https://jsci.utq.edu.iq/index.php/main/article/view/793 |
| work_keys_str_mv | AT suhahadi developingtheperformanceofdoublequantumdotsolarcellstructure AT aminhabbebalkhursan developingtheperformanceofdoublequantumdotsolarcellstructure |