高温退火预热时间对制备CIGS薄膜光伏太阳能电池性能的影响

The Influence of High Temperature Annealing Preheating Time on Performance of CIGS Solar Films

本文采用磁控溅射CIGS四元陶瓷靶材制备吸收层,高温退火采用H2Se为硒源,研究高温退火预热时间对CIGS光伏太阳能电池性能的影响。研究表明,预热时间对CIGS晶粒大小和吸收层与背电极结合性有着重要影响。随着预热时间的增加,CIGS晶粒增加,当预热时间为4.5min时,吸收层CIGS晶粒最大;但随着预热时间增加至5min时,吸收层与背电极结合性变差。吸收层晶粒尺寸增大,减少了晶界缺陷,有利于增加吸收层少子等效扩散长度,从而有利于提高电池开路电压和短路电流,最终提高电池转化效率,当预热时间为4.5min时,电池主要性能参数最优。当预热时间为5min时,吸收层CIGS与背电极Mo结合性相对较差,从而不利于短路电流的提高,并最终影响电池转化效率的提升。

In this paper,in order to research the influence of high temperature annealing preheating time on CIGS solar films,the absorber layer of CIGS was prepared by magnetron sputtering,and H2Se was used as selenium source in high temperature annealing.The results showed that preheating time had an important effect on the size of CIGS grain and the binding of absorber layer and back electrode.With the increase of preheating time,CIGS grains increased.When the preheating time was 4.5min,CIGS grains in the absorber layer were maximum.But as the increase of preheating time to 5min,the binding property between the absober layer and the back electrode became worse.The grain size of the absorber layer increased,which reduced the grain boundary defects and increased the effective diffusion length of the minority carrier in the absorber.So,it improved Voc and Isc,and finally improved the Eff solar films battery.When the preheating time was 4.5min,the main performance parameters of the battery were optimal.When the preheating time was 5min,the binding of CIGS and Mo was relatively poor,which was not conducive to the improvement of the Isc,and ultimately affected the improvement of Eff of solar films battery.