Subhan Fazal E, Khan Aimal Daud, Khan Adnan Daud, Ullah Najeeb, Imran Muhammad, Noman Muhammad
US-Pakistan Center for Advanced Studies in Energy, University of Engineering & Technology Peshawar 25000 Pakistan.
Arizona State University Tempe Arizona 85287 USA
RSC Adv. 2020 Jul 16;10(45):26631-26638. doi: 10.1039/d0ra04634e. eCollection 2020 Jul 15.
Tandem configuration-containing perovskite and silicon solar cells are promising candidates for realizing a high power conversion efficiency of 30% at reasonable costs. Silicon solar cells with planar front surfaces used in tandem devices cause high optical losses, which significantly affects their efficiency. Moreover, some studies have explored the fabrication of perovskites on textured silicon cells. However, due to improper texturing, light trapping is not ideal in these devices, which reduces the efficiency. In this work, we optimized the pyramid height of textured silicon cells and efficiently characterized them to achieve enhanced light trapping. Two different kinds of perovskites, namely, CsFAPb(BrI) and CsFAPb(BrI) with wide bandgaps were conformally deposited on textured silicon cells, and the performance of these flat and fully textured tandem devices was numerically analyzed. The thickness of each layer in the tandem cell was optimized in a way to ensure a perfect current match between the top perovskite and bottom silicon subcells. The results indicated that the textured tandem configuration enhances light absorption over a broad spectral range due to the optimized pyramid height compared to flat surfaces. Eventually, the photovoltaic parameters of the proposed tandem cell were compared with the already existing structures, and our design supports large values of open circuit voltage ( ) = 1.78 V, short circuit current density ( ) = 20.09 mA cm, fill factor (FF) = 79.01%, and efficiency () = 28.20% compared to other kinds of tandem solar cells.
含串联结构的钙钛矿和硅太阳能电池是有望以合理成本实现30%高功率转换效率的候选方案。串联器件中使用的具有平面正面的硅太阳能电池会导致高光损失，这对其效率有显著影响。此外，一些研究探索了在纹理化硅电池上制备钙钛矿。然而，由于纹理化不当，这些器件中的光捕获并不理想，从而降低了效率。在这项工作中，我们优化了纹理化硅电池的金字塔高度并对其进行了有效表征，以实现增强的光捕获。两种不同的宽带隙钙钛矿，即CsFAPb(BrI)和CsFAPb(BrI)，被共形沉积在纹理化硅电池上，并对这些平面和全纹理化串联器件的性能进行了数值分析。串联电池中各层的厚度经过优化，以确保顶部钙钛矿子电池和底部硅子电池之间实现完美的电流匹配。结果表明，与平面表面相比，由于金字塔高度得到优化，纹理化串联结构在较宽光谱范围内增强了光吸收。最终，将所提出的串联电池的光伏参数与现有结构进行了比较，与其他类型的串联太阳能电池相比，我们的设计支持开路电压(Voc)=1.78 V、短路电流密度(Jsc)=20.09 mA/cm²、填充因子(FF)=79.01%以及效率(η)=28.20%的较大值。
