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Theoretical study of graded bandgap CZTSSe solar cells with two absorber layers

机译：两个吸收层分级带隙CZTSSE太阳能电池的理论研究

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摘要

In this work, new Cu_2ZnSn(S_(1-x), Se_x)_4 (CZTSSe) solar cells consisting of two absorber layers with constant and graded bandgaps are proposed. CZTS and CZTSe are used as the constant bandgap absorbing layers of the first and second proposed cells, respectively. To validate the simulations, first, a graded bandgap CZTSSe-based cell containing AZO/ ZnO/CdS/CZTSSe/MoSe_2/Mo layers as the basic structure is investigated, revealing that the results are in good agreement with previous experimental data. The impact of varying acceptor doping concentration and temperature on the performance of proposed cells is investigated. The optimum thicknesses of the absorber layers are obtained in all cases. After optimization, maximum efficiencies of 20.99% and 21.37% are obtained for the first and second cells respectively which are significantly greater than the basic structure. The proposed structures provide higher open circuit voltage and short circuit current, compared to the basic structure.
机译：在这项工作中，提出了由具有恒定和分级带隙的两个吸收层组成的新CU_2ZNSN（S_（1-X），SE_X）_4（CZTSSE）太阳能电池。 CZT和CZTSE分别用作第一和第二提出的细胞的恒定带隙吸收层。为了验证模拟，首先，研究了包含AZO / ZnO / CDS / CZTSSE / MOSE_2 / MO层作为基本结构的基于分级的带隙CZTSSE的单元，揭示了结果与先前的实验数据吻合良好。研究了各种受体掺杂浓度和温度对所提出的细胞性能的影响。在所有情况下获得吸收层的最佳厚度。优化后，分别为第一和第二细胞获得20.99％和21.37％的最大效率，其显着大于基本结构。与基本结构相比，所提出的结构提供更高的开路电压和短路电流。

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