Modifications in the physical properties of photovoltaic materials lead to enhanced conversion efficiency of a solar cell. This paper focuses on the suitable material selection for the cadmium telluride (CdTe) solar cell with special emphasis on improving the electrical parameters such as open-circuit voltage Voc, short-circuit current density Jsc, fill factor FF, and efficiency ƞ. Simulation results showed that materials having wide bandgap are more appropriate for each layer in the proposed cell compared to small-bandgap materials. Moreover, the back metal contact, which acts as electrode and also used as light reflector, usually suffers from high intrinsic absorption losses. To reduce such losses, we replaced the metal contact by a highly reflective one-dimensional distributed Bragg reflector, which increases the optical path length in greater amount over a broad span of incident angles and frequencies, and subsequently enhances the performance of the cell. The measured electrical parameters of the proposed cell under global AM 1.5G conditions are JSC = 25.036 mA/cm2, Voc = 1.065 V, FF = 87.56%, and ƞ = 23.94%, respectively.

中文翻译：

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基于背表面场和分布式布拉格反射器的薄膜CdTe太阳能电池高效材料

光伏材料物理特性的改变可提高太阳能电池的转换效率。本文重点介绍碲化镉 (CdTe) 太阳能电池的合适材料选择，特别强调提高开路电压 Voc、短路电流密度 Jsc、填充因子 FF 和效率 ƞ 等电气参数。仿真结果表明，与小带隙材料相比，具有宽带隙的材料更适合于所提出的电池中的每一层。此外，作为电极并也用作光反射器的背面金属触点通常遭受高固有吸收损耗。为了减少这种损失，我们用高反射的一维分布式布拉格反射器代替了金属触点，这在较大的入射角和频率范围内增加了更多的光程长度，并随后提高了电池的性能。在全球 AM 1.5G 条件下，所提出电池的测量电参数分别为 JSC = 25.036 mA/cm2、Voc = 1.065 V、FF = 87.56% 和 ƞ = 23.94%。