Investigation of Cu 2 ZnSnS 4 thin-film solar cells with carrier concentration gradient
Investigation of Cu 2 ZnSnS 4 thin-film solar cells with carrier concentration gradient
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DOI：
10.1016/j.jpcs.2016.06.007
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发表时间：
2016-11
影响因子：
4
通讯作者：
Jiaxiong Xu
中科院分区：
文献类型：
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作者：
Jiaxiong Xu
为了研究载流子浓度梯度对Cu2ZnSnS4(CZTS)薄膜太阳能电池的影响，采用数值方法研究了CZTS太阳能电池的性能。利用AFors-Het v2.4程序，通过泊松方程、连续性方程和电流密度方程的解，计算了载流子浓度梯度CZTS太阳能电池的光伏性能。改变载流子浓度梯度来分析其效果。与没有载流子浓度梯度的CZTS太阳能电池相比，使用载流子浓度梯度吸收剂可以增强CZTS太阳能电池的光伏性能。载流子浓度梯度可以扩大内建电场的分布区域，有利于光生载流子的漂移。然而，载流子浓度梯度也会影响太阳能电池的复合和串联电阻。当CZTS层的缺陷密度较高时，光生载流子受复合的影响较大，导致载流子浓度梯度的影响较小。因此，应降低缺陷密度，增强载流子浓度梯度对提高CZTS薄膜太阳能电池转换效率的作用。
To investigate the effect of carrier concentration gradient on Cu2ZnSnS4(CZTS) thin-film solar cells, the properties of CZTS solar cells were studied by numerical method. The photovoltaic performances of carrier concentration gradient CZTS solar cells were calculated by the solutions of Poisson's equation, continuity equation, and current density equation using AFors-Het v2.4 program. The carrier concentration gradient was changed to analyze its effect. Compared with CZTS solar cells without carrier concentration gradient, the photovoltaic performances of CZTS solar cells can be enhanced by using carrier concentration gradient absorber. The carrier concentration gradient can extend the distribution region of built-in electric field, which is beneficial to the drift of photo-generated carriers. However, the carrier concentration gradient also affects the recombination and series resistances of solar cells. When the defect density of CZTS layer is high, the photo-generated carriers are affected significantly by recombination, resulting in slight effect of carrier concentration gradient. Therefore, the defect density should be reduced to enhance the effect of carrier concentration gradient on improving conversion efficiency of CZTS thin-film solar cells.