Fig. 2From: Research on mathematical model and calculation simulation of wireless sensor solar cells in Internet of ThingsSolar cell power generation schematic. a The solar cell of wireless sensor. b Explanation of the working principle of solar cells: the n-type silicon’s spare electrons jump over to fill the gaps in the p-type silicon. The n-type silicon becomes positively charged, and the p-type silicon is negatively charged, creating a current field across the cellBack to article page