光伏英语_第一章_____一二节课_3剖析.ppt

河源市高级技工学校 —光伏专业  2014.02.15 ; Welcom back to school! ;光伏发电技术及应用 —光伏专业英语  --------糖太尉  ;Photovoltaic[,f?ut?uvolteik] adj.光生伏打的，光伏的。 photovoltaic effect(光伏效应)；[ifekt] solar cell ， [?s?ul? ] 太阳能电池 electric [ilektrik] adj. 电动的, 电的；使人震惊的;electrodes ， 电极，[??lek?tr??d] Shining 闪亮的 Voltage [v?ultid?]，n. 电压, 伏特数 resistance 电阻 [rizist?ns] ;absorption properties 吸收性能 [?b?s?:p??n] semiconductor [?semik?n?d?kt?] 半导体 solar spectrum 太阳光谱 [?spektr?m] light quanta 光子 [?kw?nt?] electron hole pairs 电子空穴对 [i?lektr?n,-trɑ?n] Pn-junction pn结 [d??nk??n];;electric field 电场 [ilektrik] [fi:ld] contact grid 接触栅格 [?k?nt?kt] [gr?d] series 串联 [?si?ri:z] parallel 并联 [p?r?lel] ;;Typical solar cell structure; It is quite generally defined as the emergence of an electric voltage between two electrodes attached to a solid or liquid system upon shining light onto the system. ; ; Dependent on the absorption properties of the material, the light is absorbed in a region more or less near to the surface. ; These devices are also known as solar cells. ; The semiconductor material has to be able to absorb a large part of the solar spectrum. ; When light quanta are absorbed, electron hole pairs are generated, and if their recombination is prevented they can reach the junction where they are separated by an electric field. ; Even for a weakly absorbing semiconductor like silicon, most carriers aregenerated near the surface. This leads to the typical solar structure of Fig. 1.1. ; The PN junction that separates the emitter and base layer is very close to the sueface in order to have a high collection probability for the photogenerated charge carriers.; The thin emitter layer above the junction has a relatively high resistance which requires a well designed contact grid, also shown in the figure. ; For prac