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Faye, Modou
- Excitonic Conversions in Semiconductors
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Authors
Affiliations
1 Laboratoire des Semi-Conducteurs et d’Energie Solaire de la Faculté des Sciences et Techniques de l’Universite Cheikh Anta Diop de DAKAR, BP 5005, Dakar-fann, SN
1 Laboratoire des Semi-Conducteurs et d’Energie Solaire de la Faculté des Sciences et Techniques de l’Universite Cheikh Anta Diop de DAKAR, BP 5005, Dakar-fann, SN
Source
International Journal of Engineering Research, Vol 5, No 12 (2016), Pagination: 936-938Abstract
We studied the influence of parameters that govern the excitonic conversion phenomena in semiconductors. In this study we defined a surface conversion velocity of excitons to free electron-hole pairs bs and a parameter of exciton dissociation in the space charge layer b (x) related to the electric field E(x). The influence of bs on the electrons and excitons densities and on the short-circuit current shows that this parameteris a generation term for electrons and a recombination term for excitons. In the organic semiconductor where the excitons have a very short lifetime and a binding energy superior to thermal energy, an exciton conversion model is essential to increase the performance of these solarcells. Our study showed that the short circuit current has a high value when the exciton conversion speed is of the order of 104 cm.s-1.Keywords
Exciton, Excitonic Conversion, Binding Coefficient.- Surface Recombination of Excitons in Solar Cells
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In this study we considered two values of the exciton binding coefficient, b=3×10-7cm3 s-1 and b=10-15cm3 s-1, corresponding to strong coupling and weak coupling. We also defined a recombination velocity of excitons Sex reflecting loss of these pseudo particles to metal-semiconductor contacts. The study of excitonic recombination boils down to study the influence of recombination velocity Sex on the carrier density. This study found that the recombination of excitons has no impact on electrons density when the coupling is low because exciton and electron diffuse independently with their own diffusion length. However, in the strong coupling we have a negative effect of this parameter on the densities of electrons and excitons. We note also that in these conditions the increase of the electron recombination velocity results in lower of excitons density. These results confirm the coupling theory between electron and exciton developed by R. Corkish and Y. Zhang.
Authors
Affiliations
1 Laboratoire Des Semi-Conducteurs Et D’Energie Solaire De La, Universite Cheikh Anta Diop De DAKAR, BP-5005, Dakar, Fann, SN
1 Laboratoire Des Semi-Conducteurs Et D’Energie Solaire De La, Universite Cheikh Anta Diop De DAKAR, BP-5005, Dakar, Fann, SN
Source
International Journal of Scientific Engineering and Technology, Vol 5, No 10 (2016), Pagination: 482-484Abstract
We studied the influence of parameters that govern the surface recombination of excitons in a silicon solar cell subjected to a monochromatic illumination.In this study we considered two values of the exciton binding coefficient, b=3×10-7cm3 s-1 and b=10-15cm3 s-1, corresponding to strong coupling and weak coupling. We also defined a recombination velocity of excitons Sex reflecting loss of these pseudo particles to metal-semiconductor contacts. The study of excitonic recombination boils down to study the influence of recombination velocity Sex on the carrier density. This study found that the recombination of excitons has no impact on electrons density when the coupling is low because exciton and electron diffuse independently with their own diffusion length. However, in the strong coupling we have a negative effect of this parameter on the densities of electrons and excitons. We note also that in these conditions the increase of the electron recombination velocity results in lower of excitons density. These results confirm the coupling theory between electron and exciton developed by R. Corkish and Y. Zhang.
Keywords
Exciton, Coupling Coefficient, Exciton Recombination, Excitonic Conversion.- Modeling the Effects of the Average Temperature on the Capacitance of an Inorganic Semiconductor in the Presence of Excitons
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Authors
Modou Faye
1,
Cheikh Mbow
2
Affiliations
1 Departement de Physique, Laboratoires des Semiconducteurs et d’energie Solaire (LASES-SOLMATS), University Cheikh Anta Diop, Dakar, SN
2 Departement de Physique, Laboratoire de Mécanique des Fluides, Hydraulique et Transferts, University Cheikh Anta Diop, Dakar, SN
1 Departement de Physique, Laboratoires des Semiconducteurs et d’energie Solaire (LASES-SOLMATS), University Cheikh Anta Diop, Dakar, SN
2 Departement de Physique, Laboratoire de Mécanique des Fluides, Hydraulique et Transferts, University Cheikh Anta Diop, Dakar, SN