Unsourced material may be challenged and removed. The lamp operates on electricity from batteries, charged through the use of solar power advantages and disadvantages pdf photovoltaic panel.
In addition, solar lamps produce no indoor air pollution unlike kerosene lamps. However, solar lamps generally have a higher initial cost, and are weather dependent. Efficiency in production of LED lamps has led to increased adoption as an alternative to other electric lighting. The whole structure of solar lamp is shown in Figure 2.
Semiconductors normally do not conduct electricity but under certain circumstances they do in this example with exposition to light. The lower layer has less electrons and hence has a slight positive charge due to the negative charge nature of electrons. In addition, the upper layer has more electrons and has slightly negative charge. A barrier is created between these two layers however when the stream of light particles called photons enter, they give up their energy to the atoms in the silicon. It promotes one electron from a covalent bond to a next energy level from upper layer to the lower layer. This promotion of an electron allows freer movement within the crystal which produces a current. More light shines through, more electrons move around hence more current flows between.