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Fig. 2 | Nanoscale Research Letters

Fig. 2

From: High-Efficiency Silicon Inverted Pyramid-Based Passivated Emitter and Rear Cells

Fig. 2

Morphology of the prepared Si inverted pyramid structures (Si IPs-strus). a SEM image of porous silicon obtained by MACE. b SEM image of nanoholes by the following modifications in the HF/HNO3 mixed solutions. ce SEM images of inverted pyramids (cross section in inset) by the etching in aqueous NaOH solution at 60 °C for 30, 60, and 90 s, respectively. f Compared photos for different surface structures corresponding to ae

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