CdS/Cu_2O太阳能电池的制备及膜厚对光电性能的影响

Preparation of CdS/Cu_2O Films by CBD Method for Solar Cell

采用水浴法和电沉积法制备CdS/Cu2O复合膜,组装成异质结薄膜太阳能电池。通过改变薄膜的厚度,测试了不同厚度的窗口层和吸收层对太阳能电池性能的影响。实验表明,在400 nm厚的CdS薄膜上沉积30次Cu2O薄膜,所获得的复合膜具有最大的填充因子FF(为0.42)和光电转换效率η(0.05%)。并通过实验发现,适当减少CdS窗口层的厚度,可以提高光的透射率,产生更多的光生载流子,提高了光电转换效率。适当增加Cu2O吸收层的厚度,可以提高光的吸收率,产生更多的光生载流子,提高了光电转换效率。

CdS/Cu2O p-n junction thin films are prepared by chemical bath deposition（CBD） method.The heterojunction solar cells are assembled and the photoelectric properties are measured.The effect of thickness of window and absorbing layers on the solar cells efficiency is explored by altering the thickness of CdS/Cu2O films.Experimental results indicate that the CdS film with a thickness of 400 nm deposited by Cu2O film for 30 times have a high photoelectric conversion efficiency η（0.05%）,and the fill factor is up to 0.42.Moreover,it is found that limit the thickness of window layer CdS is facility of photo transmittance,while increase the thickness of absorption layers Cu2O is benefit to improve the adsorption of transmitted light,introducing more photo-carrier and improving the photoelectric conversion efficiency.