Photovoltaics glossary AC交流电 Alternating current Amorphous silicon solar cell 非晶硅太阳能电池 Thin-film solar cells are usually produced by evaporating several semi-conductor films onto a so-called "substrate" Ampère 安培 Unit indicating the strength of electric current Assembling system 集成系统 System to install solar modules on roofs, façades or in the field. Azimuth angle 方位角 Describes the deviation from the South towards East-western direction Building-integrated PV (BIPV) Used to describe a structure where PV replaces conventional materials and is integrated into the building. Typically, a photovoltaic array is incorporated into the roof or walls of a building. Roof tiles with integrated PV cells can now be purchased. Arrays can also be retrofitted into existing buildings; in this case they are usually fitted on top of the existing roof structure. Alternatively, an array can be located separately from the building but connected by cable to supply power for the building. By-pass diode 旁路二极管 Conducts the electricity automatically past a module in case it is shadowed in one series. This is supposed to prevent any destruction due to overheating. Circuit 电路 A system of conductors that convey electricity. CdTe solar cell碲化镉太阳能电池 Thin-film solar cell made of very thin CdTe semi-conductor films (< 3 microns) CIS solar cell Thin-film