Abstracts Dielectric layers on the back surface of a solar cell not only enhance the back reflection but also contribute to better light management by minimizing the absorption loss that happens for conventional back metal contacts. Considering the critical applications of back dielectric layers in solar photovoltaic (PV) technology, their physical characteristics must be optimized, which is the goal of this present investigation. Thin (∼30 μm) c Si-based advanced solar cells that are gradually drawing the attention of modern PV technology; have been chosen as the typical case here. Theoretical optimization of thickness-dependent light reflection capabilities for two different types of dielectric stacks, namely, SiO2/Al2O3 and HfO2/Al2O3 have been carried out. COMSOL Multiphysics™ simulator based on the finite element method (FEM) numerical solution technique has been used. The electromagnetic wave frequency domain (EWFD) module has been used for computational purposes. The back layer engineering using double dielectric back reflector layers has been carried out to overcome the light transmission losses that are usually prevalent in thin (∼30 μm) c-Si solar cells at longer wavelengths. Such analyses are of immense importance for thin c-Si based PERC solar cells also. The carrier generation rate, external quantum efficiency (EQE), and maximum achievable photocurrent density (MAPD) have been measured for the optimized cell structures that resulted in a significant increment in each of the parameters. This makes such back reflecting structures worth implementing in thin c-Si based advanced solar cells to minimize the transmission losses at longer wavelengths.

中文翻译：

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薄c-Si基先进太阳能电池双介质背反射层的理论优化，MAPD显着增强

摘要 太阳能电池背面的介电层不仅增强了背反射，而且通过最大限度地减少传统背面金属触点的吸收损失，有助于更好的光管理。考虑到背介电层在太阳能光伏 (PV) 技术中的关键应用，必须优化它们的物理特性，这是本研究的目标。薄（~30 μm）c 硅基先进太阳能电池正逐渐引起现代光伏技术的关注；在这里被选为典型案例。已经对两种不同类型的电介质堆叠（即 SiO2/Al2O3 和 HfO2/Al2O3）的厚度相关光反射能力进行了理论优化。已使用基于有限元法 (FEM) 数值求解技术的 COMSOL Multiphysics™ 模拟器。电磁波频域 (EWFD) 模块已用于计算目的。使用双介电背反射器层的背层工程已被实施以克服在较长波长的薄（~30μm）c-Si太阳能电池中通常普遍存在的光传输损失。这种分析对于薄的基于 c-Si 的 PERC 太阳能电池也非常重要。已针对优化的电池结构测量了载流子生成率、外量子效率 (EQE) 和最大可实现光电流密度 (MAPD)​​，这些结构导致每个参数的显着增加。