Modelling of the functional characteristics of photoelectric converters based on multi-component solid solution AlxGa1-xAs, received from a liquid phase epitaxy
UDC
539.231Abstract
The most important technological problems of solar energetics are reduction of production costs of photoelectric converters and increase their efficiency. This paper presented a theoretical and experimental study of solar cells based on solid solution AlxGa1-xAs, received from a liquid phase epitaxy. The investigated structure was grown by means of liquid phase epitaxy. The GaAs plate was used as a substrate. The Al0.28Ga0.72As base layer was grown according to the cascade method of refrigeration. Thin emitter layers Al0.1Ga0.9As and a wide bandgap window Al0.9Ga0.1As were produced at lower temperatures (600 °C), from a thin layer of molten aluminum gallium arsenic (0.5 mm thick). The modelling was performed by using AFORS-HET program. During the simulation the following parameters of semiconductor layers were changed: composition of the ternary solution, thickness of the layers, doping level of the layers. Characteristics of the layers for different AlxGa1-xAs compositions were calculated by means of MATLAB 7 application program package. No defects were supposed to be present in the structure, the temperature of the photoelectric converter and the environment was equal to 300 K, multiplicity of radiation was equal to 1, and the conditions of sunlight lighting were equal to AM 1,5. The article shows that an optimum composition of the solid solution for the base layer Al0.28Ga0.72As, is the following: the thickness of layer is 100 microns and the concentration of the acceptor impurity is 1019 cm-3. For the emitter layer Al0.1Ga0.9As optimum layer thickness is 50 nm, optimum concentration of the donor impurity is 1016 cm-3 and the wide bandgap window Al0.9Ga0.1As optimum thickness is 50 nm, optimum concentration of impurity is 2.5$\cdot$1017 cm-3. The conversion efficiency in this case can reach 40.99%.
Keywords:
solar energetics, photoelectric converters, liquid-phase epitaxy, modelingAcknowledgement
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Copyright (c) 2016 Arustamyan D.A., Chebotarev S.N., Lunin L.S., Lunina M.L., Kazakova A.E., Pashchenko A.S.
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