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Energy levels distribution in supersaturated silicon with titanium for photovoltaic applications

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Pérez, E. and Castán, H. and García, H. and Dueñas, S. and Bailón, L. and Montero Álvarez, Daniel and García-Hernansanz, R. and García Hemme, Eric and Olea Ariza, Javier and González Díaz, Germán (2015) Energy levels distribution in supersaturated silicon with titanium for photovoltaic applications. Applied physics letters, 106 (2). ISSN 0003-6951

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Official URL: http://dx.doi.org/10.1063/1.4905784


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Abstract

In the attempt to form an intermediate band in the bandgap of silicon substrates to give it the capability to absorb infrared radiation, we studied the deep levels in supersaturated silicon with titanium. The technique used to characterize the energy levels was the thermal admittance spectroscopy. Our experimental results showed that in samples with titanium concentration just under Mott limit there was a relationship among the activation energy value and the capture cross section value. This relationship obeys to the well known Meyer-Neldel rule, which typically appears in processes involving multiple excitations, like carrier capture/emission in deep levels, and it is generally observed in disordered systems. The obtained characteristic Meyer-Neldel parameters were Tmn = 176 K and kTmn = 15 meV. The energy value could be associated to the typical energy of the phonons in the substrate. The almost perfect adjust of all experimental data to the same straight line provides further evidence of the validity of the Meyer Neldel rule, and may contribute to obtain a deeper insight on the ultimate meaning of this phenomenon. (C) 2015 AIP Publishing LLC.


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© 2015 AIP Publishing. The study has been supported by the Spanish TEC2011 under Grant No. 27292-C02-01, TEC2013-41730-R funded by the Ministerio de Economia y Competitividad, and the P2013/MAE-2780 funded by the Comunidad de Madrid. Research of E. Perez was supported by a University of Valladolid FPI Grant. J. Olea acknowledge financial support from the MICINN within the program Juan de la Cierva (JCI-2011-10402), under which this research was undertaken. Research by E. Garcia-Hemme was also supported by a PICATA predoctoral fellowship of the Moncloa Campus of International Excellence (UCM-UPM).

Uncontrolled Keywords:Meyer-Neldel rule; Nonradiative recombination; Solar-Cells; Relaxation; Layers
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:33528
Deposited On:09 Oct 2015 12:27
Last Modified:10 Dec 2018 14:57

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