本文利用三步法共蒸发制备Cu(In,Ga)Se_2多晶薄膜吸收层,通过改变第三步Ga的蒸发温度控制薄膜表面Ga的含量及其分布.随着吸收层表面Ga含量的增大,空间电荷区带隙变宽,电池的开路电压V_(oc)明显增大.同时,Ga的梯度分布有效地扩宽了吸收层的光谱响应范围,减小了由于禁带宽度增大所引起的短路电流J_(sc)的损失,从而有效地提高了电池的转换效率.
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