1、Solar Cell Principles and application第講座研究室 岳丹丹日期 2010.11.141What are solar cells?Photovoltaics (PV) is the science of direct conversion of light to D.C. electricity, based on the fundamental principle of “photovoltaic effect”. This phenomenon is exhibited in semiconductor materials.2How do solar ce

2、lls work?PV effect holes electrons 3How do solar cells work?4N-type and P-type5P-N junction generationA silicon atom has 4 relatively weakly bound electronsP-type doping, the creation of excess holes, is achieved by the incorporation into the silicon of atoms with 3 valence electrons, most often bor

3、on N-type doping, the creation of extra electrons is achieved by incorporating an atom with 5 valence electrons, most often phosphorus 6Solar cell production process7Types of silicon used for making solar cellsType of SiliconAbbreviationCrystal Size RangeMethod for ProductionSingle-crystal siliconc-

4、Si10cmCrystal growth by Czochralski (CZ),Float zone (FZ)Multicrystalline siliconmc-Si1mm-10cmCast : Sheet & ribbonMicro crystalline siliconc-Si0.1 m 1 mPlasma Enhanced Chemical-vapor deposition (PECVD)Nano crystalline siliconnc-Si1 mPECVDAmorphous silicon a-Si Crystallites absentPECVD89Crystalline s

5、ilicon solar cells: mono crystalline silicon (c-Si) and multicrystalline silicon (mc-Si) Surface barrier solar cells (a-Si on c-Si) Passivated Interface (PI) at hetero junction Thin film solar cells: amorphous silicon (a-Si)polycrystalline copper indium diselenide (CIS) or copper-indium-gallium - se

6、lenide / sulphide (CIGS) cadmium telluride (CdTe)thin-film crystalline siliconGallium arsenide (GaAs) and multi junction cells (GaInP / GaAs / Ge ) with super-high efficiency Nano crystalline Dye-sensitized TiO2 based and other nano-structured solar cellsOrganic (Polymer) solar cellsTypes of solar cells based on choice