Diversity of solar cell Classified by structure: Classified by purpose: Homojunction solar cell Space solar cell Heterojunction solar cell Ground solar battery Schottky junction solar cell Light sensor Composite junction solar cell Liquid junction solar cells Classified by work method: Flat solar battery Concentrating solar cell
Classified by structure: Homojunction solar cell Heterojunction solar cell Schottky junction solar cell Composite junction solar cell Liquid junction solar cells Diversity of solar cell Classified by purpose: Space solar cell Ground solar battery Light sensor Classified by work method: Flat solar battery Concentrating solar cell
How silicon solar cells work There are 4 electrons in the outer shell of the silicon atom.The bondage of the nucleus is relatively small.If the electrons get enough energy,they will get rid of the bondage of the nucleus and become a free electron,while leaving a hole in the original position.Electrons are negatively charged;holes are positively charged. Valence electrons covalent bond In pure silicon crystals,the number of free electrons and holes is equal
How silicon solar cells work There are 4 electrons in the outer shell of the silicon atom. The bondage of the nucleus is relatively small. If the electrons get enough energy, they will get rid of the bondage of the nucleus and become a free electron, while leaving a hole in the original position. Electrons are negatively charged; holes are positively charged. In pure silicon crystals, the number of free electrons and holes is equal. Si + 4 + 4 + 4 + 4 covalent bond Valence electrons
Schematic diagram of silicon atoms BAC0633369
Schematic diagram of silicon atoms
Key concepts To separate an electron from an atom of silicon requires 1.12 ev of energy,which is called the band gap of silicon.The separated electrons are free electrons. which can move freely and transmit electric current. Si Si Si Si Si Si Covalent bond structure of silicon atom
Key concepts To separate an electron from an atom of silicon requires 1.12 eV of energy, which is called the band gap of silicon. The separated electrons are free electrons, which can move freely and transmit electric current. Covalent bond structure of silicon atom
n-type semiconductor Extra electron +4 +4 Si Si 少数载流子 :空穴 Phosphorus DoBor o 多数载流子 :电子 Si Si Si 渗入磷，电子增加 N型半导体 http://b(Negative)net/cyousui the holes are red and the Immovable positively charged center electrons are blue
n-type semiconductor Extra electron Phosphorus Donor the holes are red and the electrons are blue. Immovable positively charged center