Abstract
Enhancing the light absorption in thin film silicon solar cells with nanophotonic and plasmonic structures is important for the realization of high efficiency solar cells with significant cost reduction. In this work, we investigate periodic arrays of conformal metal/silicon nanobowl arrays (MSNBs) for light trapping applications in silicon solar cells. They exhibited excellent light-harvesting ability across a wide range of wavelengths up to infrared regimes. The optimized structure (MSNBsH) covered by SiO2 passivation layer and hemisphere Ag back reflection layer has a maximal short-circuit density (Jsc) 25.5 mA/cm2, which is about 88.8% higher than flat structure counterpart, and the light-conversion efficiency (η) is increased two times from 6.3% to 12.6%. The double-side textures offer a promising approach to high efficiency ultrathin silicon solar cells.
Highlights
Solar energy is widely considered to be a reasonable solution for the loss of fossil fuels in the coming days
We demonstrate that broadband solar absorption enhancement across a wide range of wavelengths up to infrared regimes can be achieved by employing a periodic arrays of conformal metal/silicon nanobowl arrays (MSNBs) design
The coefficients of Auger and bimolecular radiative recombinations are hole 9.9 × 10−32 cm6/s and electron 2.8 × 10−31 cm6/s and 1.64 × 10−14 cm3/s (see Figure 5(a)). In this device simulation we calculated the short-circuit density (Jsc), open circuit voltage (Voc), fill factor (FF), and power conversion efficiency of flat silicon arrays covered by SiO2 passivation layer and hemisphere Ag back reflection layer and SiNB covered by SiO2 passivation layer and hemisphere Ag back reflection layer (SNBsH) and MSNBsH structures (Table 1)
Summary
Solar energy is widely considered to be a reasonable solution for the loss of fossil fuels in the coming days. With the huge decrease of metal mass, serious light-decay in metal nanoparticles which cause high light absorption is fixed in MSNBs. In this paper, we demonstrate that broadband solar absorption enhancement across a wide range of wavelengths up to infrared regimes can be achieved by employing a periodic arrays of conformal metal/silicon nanobowl arrays (MSNBs) design. We demonstrate that broadband solar absorption enhancement across a wide range of wavelengths up to infrared regimes can be achieved by employing a periodic arrays of conformal metal/silicon nanobowl arrays (MSNBs) design Such nanophotonic-plasmonic structure can be produced using well-established metal-assisted electroless etching technique [32,33,34]. We study the effect of bowl size, metal choice, and hemisphere Ag back reflection for optimizing the light trapping efficiency and solar cell performance
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