Fig. 10From: A Dual Four-Quadrant Photodetector Based on Near-Infrared Enhanced Nanometer Black SiliconThe surface morphology and absorption spectra of the materials at different optical power density a 2.5 kJ/m2, b 4.5 kJ/m2, c 6.0 kJ/m2, d 9.0 kJ/m2Back to article page