In this report, four different metallic grid connectivity models, namely graphene, aluminum, gold, and silver for the copper gallium diselenide/copper indium gallium diselenide (CGS/CIGS) dual-junction solar cell, are discussed. In this structure, it is assumed that the metal contact with the aluminum-doped zinc oxide (ZnO:Al) layer forms an ohmic contact. This assumption is true since the metal grids are sandwiched. The sandwich metal grid is such that at first a metal layer having an ohmic contact with ZnO:Al is deposited, then the desired metal layer is placed on the metal layer as contact. In fact, this metal grid replaces the transparent conductor oxide (TCO) in the structure. Using a metal grid instead of a TCO will increase the transparency and thus be more absorbent, because the TCO also has some absorption and does not allow much light to enter the absorber layer. Based on the results of the simulation and comparison of the performance of the metal patterns, we conclude that by choosing the graphene ohmic contact, we will achieve higher efficiency and absorption. The CIGS dual-junction solar cell features were obtained by graphene metal grid, short circuit current of 14.7403 mA/cm 2 , open circuit voltage of 1.99054 V, fill factor of 38.78%, and efficiency of 11.38%.

中文翻译：

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CIGS双结太阳能电池的提出及不同金属栅极效应的研究

在本报告中，讨论了四种不同的金属网格连接模型，即用于铜二硒化镓/铜铟镓二硒 (CGS/CIGS) 双结太阳能电池的石墨烯、铝、金和银。在该结构中，假设金属与掺杂铝的氧化锌 (ZnO:Al) 层的接触形成欧姆接触。这个假设是正确的，因为金属网格被夹在中间。夹心金属栅是这样的：首先沉积与ZnO:Al具有欧姆接触的金属层，然后将所需的金属层放置在金属层上作为接触。事实上，这种金属网格取代了结构中的透明导体氧化物 (TCO)。使用金属网格代替 TCO 会增加透明度，从而更具吸收性，因为 TCO 也有一些吸收，不允许太多光进入吸收层。基于模拟结果和金属图案性能的比较，我们得出结论，通过选择石墨烯欧姆接触，我们将实现更高的效率和吸收。CIGS双结太阳能电池特性由石墨烯金属栅获得，短路电流为14.7403 mA/cm 2 ，开路电压为1.99054 V，填充因子为38.78%，效率为11.38%。