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SM ISO690:2012 SUMAN, Victor, KOLIBABA, Gleb, FEDOROV, Vladimir, RUSNAC, Dumitru, ROTARU, Corneliu. Material aspect of CdS/CdTe:Mn solar cells. In: Materials Science and Condensed Matter Physics, Ed. 9, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, Ediția 9, p. 312. |
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Materials Science and Condensed Matter Physics Ediția 9, 2018 |
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Conferința "International Conference on Materials Science and Condensed Matter Physics" 9, Chișinău, Moldova, 25-28 septembrie 2018 | |||||||
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CZU: 620.91+621.383.51+66 | |||||||
Pag. 312-312 | |||||||
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The technology of obtaining high-efficiency CdS/CdTe:Mn photovoltaic cells has been developed, using different conditions of growth and recrystallization. The layers have been obtained by evaporation in a high vacuum (HVE), with Mn concentration of up to 40 wt. % in the initial CdTe material. A study on the structure and chemical composition of the obtained photoelectric elements has been performed by selective electron microscopy. The modeling has been applied to simulate the photocurrent to establish the relation between the electrical properties of the solar cells CdS/CdTe:Mn and their structure/composition. It is shown that thermal treatment at the presence of CdCl2 improves the photoelectric properties of the solar cells. The results of diffusion of Cl in CdTe:Mn, segregation of Cl at the CdS/CdTe:Mn boundary, a decrease of internal stresses and defect concentration at the interface of CdS/CdTe:Mn as well as in the volume of CdTe:Mn, are demonstrated. It has been established that the crystallization and morphology of CdTe:Mn layers depends on the deposition method of CdTe and CdS, and on the thermal treatment at the presence of CdCl2 (Fig. 1(a)). The CdTe:Mn layers, deposited on HVE-CdS, grow with the preferred orientation (111) in the 350-420 oC temperature range. The maximum concentration of Mn impurity, which we reach in the CdTe layers, is about 0.5 wt. %. The highest efficiency of CdS/CdTe:Mn solar cells is 12.9 % at 27 °C, when HVE-CdS layers have thickness of about 500 nm and CdTe:Mn layers have thickness of 10 μm. The measurements of photoelectrical characteristics of the solar cells CdS/CdTe:Mn at 45 °C, show a decrease in efficiency by only 0.3 %. This indicates that the obtained structures can operate in a wide range of temperatures. |
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