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SM ISO690:2012 BODNAR, I., DERMENJI, Lazari, GUK, Maxim, LEVCENKO, Sergiu, ARUSHANOV, Ernest, SYRBU, Nicolae. CPPP 12 P Reflectivity spectra of Cu2ZnSnSe4. In: Materials Science and Condensed Matter Physics, Ed. 6, 11-14 septembrie 2012, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2012, Editia 6, p. 151. ISBN 978-9975-66-290-1. |
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Materials Science and Condensed Matter Physics Editia 6, 2012 |
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Conferința "Materials Science and Condensed Matter Physics" 6, Chișinău, Moldova, 11-14 septembrie 2012 | |||||
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Pag. 151-151 | |||||
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Recently a promising quaternary Cu2ZnSnSe4 compound absorber layers have attracted considerable interest due to their low cost, low-toxic and abundant elements. Thin film solar cells of Cu2ZnSnSe4 with efficiency exceeding 9 % have been fabricated so far [1]. In this paper we present reflectivity spectra measured at 300 K in the photon energy range of 1.5 - 6 eV. Cu2ZnSnSe4 crystals were grown by directional crystallization of the melt. The composition of the crystals was determined by the energy dispersive X-ray micro-analysis (EDAX). The average atomic ratio of Cu:Zn:Sn:Se was found to be close to stoichiometry. The reflectivity is measured using two-beam spectrometer Specord M-40.figureFig.1 Reflectivity spectra (R), the extinction coefficient (K) and phase of reflected ray (ф) vs energy. The Cu2ZnSnSe4 crystals show well pronounced structures of the reflectivity spectra in the range of E > Eg at 300 K as presented in Fig.1. Up to 11 peaks are observed. By using the Kramers-Kronig relations the spectral dependences of the real ε1 and imaginary ε2 component of the complex dielectric function ε(E) = ε1(E) + i×ε2(E) has been calculated for the investigated materials. As a result, the energy band structure of Cu2ZnSnSe4 at photon energies higher than the fundamental band gap is derived from the analysis of the structures observed in ε(E) spectra. Additionally, the spectral dependence of the complex refractive index, extinction coefficient and absorption coefficients of Cu2ZnSnSe4 crystals are determined in the 1.5-6 eV photon energy range. Financial supports from IRSES PVICOKEST – 269167 and STCU # 5402 projects are acknowledged. [1] I. Repins, C. Beall, N. Vora , C. De Hart, D. Kuciauskas, P. Dippo, B. To, J. Mann, Wan-Ching Hsu, A. Goodrich, R. Noufi, Sol. Energy Mat. Sol. Cells 101 (2012) 154 |
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