Self-assembled multifunctional nanostructures for surface passivation and photon management in silicon photovoltaics
Self-assembled multifunctional nanostructures for surface passivation and photon management in silicon photovoltaics
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DOI：
10.1515/nanoph-2021-0472
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发表时间：
2021-11
期刊：
影响因子：
7.5
通讯作者：
M. J. Hossain;Mengdi Sun;G. Doerk;P. Kik;K. Davis
中科院分区：
文献类型：
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作者：
M. J. Hossain;Mengdi Sun;G. Doerk;P. Kik;K. Davis
摘要本工作报道了使用自组装工艺形成的多功能纳米结构钝化层的制造和表征，该钝化层在晶体硅光伏（PV）电池中提供表面钝化和改善的光捕获。可扩展的嵌段共聚物自组装和气相渗透工艺用于在晶体硅上形成氧化铝纳米结构（Al 2 O 3）阵列，而无需衬底蚀刻。Al2O3纳米结构的特征在于使用扫描电子显微镜（SEM），透射电子显微镜（TEM），和光谱椭圆偏振。依赖于注入水平的光电导测量用于确定样品的有效载流子寿命，以确认纳米结构成功钝化了Si表面。有限元法模拟和反射率测量表明，纳米结构通过抑制金属接触中的寄生光学损耗来增加PV电池的内部后反射率。一个优化的形态结构被确定为它们的潜在用途在PV电池作为多功能材料提供表面钝化，光子管理，和载流子传输途径。
Abstract This work reports the fabrication and characterization of multifunctional, nanostructured passivation layers formed using a self-assembly process that provide both surface passivation and improved light trapping in crystalline silicon photovoltaic (PV) cells. Scalable block copolymer self-assembly and vapor phase infiltration processes are used to form arrays of aluminum oxide nanostructures (Al2O3) on crystalline silicon without substrate etching. The Al2O3 nanostructures are characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and spectroscopic ellipsometry. Injection-level dependent photoconductance measurements are used to determine the effective carrier lifetime of the samples to confirm the nanostructures successfully passivate the Si surface. Finite element method simulations and reflectance measurement show that the nanostructures increase the internal rear reflectance of the PV cell by suppressing the parasitic optical losses in the metal contact. An optimized morphology of the structures is identified for their potential use in PV cells as multifunctional materials providing surface passivation, photon management, and carrier transport pathways.