Abstract
In order to improve efficiency of flexible III-V semiconductor multi-junction solar cells, it is important to enhance the current density for efficiency improvement and to attain an even efficiency of solar cells on a curved surface. In this study, the nanotextured InAlP window layer of a GaAs single-junction solar cell was employed to suppress reflectance in broad range. The nanotextured surface affects the reflectance suppression with the broad spectrum of wavelength, which causes it to increase the current density and efficiency of the GaAs single-junction solar cell and alleviate the efficiency drop at the high incident angle of the light source. Those results show the potential of the effectively suppressed reflectance of multi-junction solar cells and even performance of solar cells attached on a curved surface.
Highlights
Enhancement of GaAsFlexible III-V semiconductor solar cells (SCs) are advantageous materials with rare heat loss compared to Si SCs
The doping concentration and thickness of each layer were grown under the following conditions: a 0.3 μm p-type GaAs contact layer with a hole concentration of 1.49 × 1019 cm−3 and a GaAs bottom cell consisting of a 0.3 μm p-type GaAs contact layer with a hole concentration of 1.49 × 1019 cm−3, a 100 nm thick 3.94 × 1018 cm−3 p-type In0.51 Ga0.49 P back surface field (BSF) layer, a
To make a SiO2 layer with a diameter of about 300 nm, PS beads were dry etched of 10 °C were compared with different surface conditions so as to examine the omnidirectional effect
Summary
Enhancement of GaAsFlexible III-V semiconductor solar cells (SCs) are advantageous materials with rare heat loss compared to Si SCs. III-V semiconductor SCs show a high efficiency even with a thin film. The photocurrent conversion efficiency (η) of GaAs SCs predicted by theoretical calculations or demonstrated by actual fabrication has been found to be higher than that of silicon [1,2,3,4,5,6]. A higher η with thin thickness is an advantageous factor for flexible SCs applied to a wearable or portable device [7,8,9,10,11,12].
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