多晶硅太阳电池转换效率和晶体缺陷相关性

Correlation between polycrystalline based solar cell conversion efficiency and crystallization defects

多晶硅太阳能电池组件以它显著的综合成本优势被广泛应用.铸锭多晶硅的晶体缺陷特征与其电池转换效率有着强烈的关联性.晶体的底部和顶部缺陷密度高,对应的电池转换效率低（14.5∽15.5%）;晶体中部因为较低的缺陷密度,对应着较高的电池转换效率（16.5∽17.5%）.不同种类的晶体缺陷对电池效率的影响又不尽相同,比如位错等顽固性缺陷会保留至终,而间隙态金属杂质等可去除的缺陷则会在电池制备过程中得以消除.

With remarkable advantage of comprehensive cost,multicrystalline based photovoltaic module products become the most competitive and w idely used PV products. A strong correlation w as found betw een crystal defects of multicrystalline silicon and the cell efficiency thereby. The defect density at the bottom and top brick is very high,as a result,the corresponding cell efficiency is low（ 14. 5 ∽ 15. 5%）. The cell efficiency of the w afers from the middle position of brick is high（ 16. 5 ∽ 17. 5%） due to the low defect density. How ever,different kinds of defects exert different influence on the cell performance. For instance,some stable defects（ such as dislocation） w ill survive at the final cell,and some other defects（ such as interstitial metal impurities） are removed during the cell process.