About Solar Power

Solar Power Generation has High Potential as a Power Generation System that will be a Key Driver in Clean Electricity Supply

Photovoltaic power is a clean energy in which sunlight is converted directly into electricity utilizing the characteristic of semiconductors, such as silicon, and metal compounds to react to light.

How Solar Power Works

When light hits the solar cell, positively and negatively charged particles (holes and electrons) are generated. Electrons flow to the N-type silicon, and holes flow to the P-type silicon. As a result, an electric current is generated.

Types of Solar Cells

Two types of silicon semiconductors exist: crystalline and thin film. The crystalline type is made by melting silicon, letting it solidify, and then slicing the crystals and using the cut substrate. The thin film type is made by depositing a very thin layer of silicon onto glass and other substrates, using plasma, etc.

Crystalline Silicon Mono-crystalline These are the oldest solar cells. The cells are made from substrates of thin mono-crystalline silicon of 200µm-300µm in thickness. While the high prices of the substrates are a drawback, these solar cells have outstanding performance and reliability.
Polycrystalline These solar cells are made from substrates molded from a number of relatively small crystals. They are the prevailing cells as they are cheaper and easier to produce than mono-crystalline silicon cells. The conversion ratio is slightly less efficient than mono-crystalline panels.
Thin Film Silicon Amorphous silicon or crystalline silicon is deposited in a very thin layer of less than 1µm in thickness onto a backing substrate such as glass to make these solar cells. While one advantage is that they can be produced in large sizes, their performance is less efficient compared with crystalline silicon solar cells.