研究目的
Investigating the long wavelength optical losses of silicon solar cells featuring hole-selective molybdenum oxide (MoOx) rear contacts and their potential for enhancing photogenerated current density with nanostructured dielectric layers.
研究成果
Optical simulations revealed that parasitic optical absorption in the Ni interlayer is a dominant loss mechanism in hole-selective rear contacts. Dielectrically passivated surfaces and nanostructured contacts, especially inverse cylindrical passivation nanostructures, can reduce optical and recombination losses, enhancing photogenerated current density.
研究不足
The study is limited by computational power, especially in calculating absorption profiles for the whole rear surface. The simulations focus on optical losses and do not fully account for recombination and resistive losses.
1：Experimental Design and Method Selection:
Optical simulations were conducted using SunSolve for ray tracing and Lumerical for finite difference time domain (FDTD) simulations to evaluate photogenerated current (JG) and potential improvements in light trapping with nanostructured dielectric layers.
2：Sample Selection and Data Sources:
Monocrystalline p-type cells with rear MoOx contacts were simulated, considering different contact metals and fractions, and nanostructured dielectric layers.
3：List of Experimental Equipment and Materials:
SunSolve and Lumerical simulation tools, silicon solar cells with MoOx rear contacts, various rear contact metals (Ni, Al), and nanostructured dielectric layers (Al2O3, SiNx).
4：Experimental Procedures and Operational Workflow:
Simulations included ray tracing for optics and JG calculation, and FDTD for evaluating light trapping improvements. Reflectance, scattering, absorption, and transmission were analyzed.
5：Data Analysis Methods:
JG values were calculated for different rear surface configurations, and reflectance and absorption characteristics were analyzed for nanostructured contacts.
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