Fig. 2: Enhancing the light absorption of SiMPF by etching.
From: Stretchable and colorless freestanding microwire arrays for transparent solar cells with flexibility
a SEM image of flat-tip SiMPF without etching (scale bar: 10 μm). b Slanted-tip SiMPF with etching by HNAD solution having a HF: HNO3: CH3COOH: DMF volume ratio of 3:6:0.3:0.7 (scale bar: 5 μm). c Simulated reflectance of SiMPF with difference angle of etched surface. The electric field intensity in the d flat and e slanted-tip SiMPF. f The total amount of electromagnetic energy in a single flat-tip SiMPF (black solid line) and slanted-tip SiMPF (red solid line). g Transmittance spectra of the slatned SiMPF of different center-to-center distance between microwires. h Reflectance spectra of the flat-tip (circle dot) and slanted-tip SiMPF (square dot) as a function of wavelength. i The total amount of absorption in slanted-tip SiMPF: 4 μm (green line), 5 μm (blue line), 6 μm (yellow line), and 7 μm (red line).
