Role of Interfacial Oxide Layer in MoOx/n-Si Heterojunction Solar Cells
Role of Interfacial Oxide Layer in MoOx/n-Si Heterojunction Solar Cells
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界面氧化物层在 MoOx/n-Si 异质结太阳能电池中的作用
DOI：
10.1155/2021/6623150
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发表时间：
2021-04
影响因子：
3.2
通讯作者：
Zhongquan Ma
中科院分区：
文献类型：
--
作者：
Xiaomin Song;Zengguang Huang;Ming Gao;D. Y. Chen;Z. Fan;Zhongquan Ma
界面氧化层在MoOx/ n -Si异质结（MSHJ）太阳能电池中起着至关重要的作用。然而，这一界面层的性质尚不清楚。本研究在实验结果的基础上，从理论上分析了界面氧化层在MSHJ器件载流子输运中的作用。界面氧化层被认为是两层：准p型半导体界面氧化层（SiOx(Mo)）1和缓冲层（SiOx(Mo)）2，其中由于氧空位和钼离子相关的三元杂化而存在许多带负电荷的中心。（SiOx(Mo)）1和（SiOx(Mo)）2的厚度分别约为2.0 nm和1.5 nm。模拟结果表明，准p型层表现为半导体材料，具有2.30 eV的宽带隙，有利于负电荷中心的空穴输运。此外，光学带隙为1.90 eV的缓冲层在MoOx/ n -Si器件的钝化中起着至关重要的作用。此外，界面层的负电荷中心在场钝化和隧道化过程中具有双重作用。结合实验结果，阐明了MSHJ太阳能电池的界面物理特性和载流子输运机制，为实现MSHJ太阳能电池的高效率提供了有效途径。
Interfacial oxide layer plays a crucial role in a MoOx/ n -Si heterojunction (MSHJ) solar cell; however, the nature of this interfacial layer is not yet clarified. In this study, based on the experimental results, we theoretically analyzed the role of the interfacial oxide layer in the charge carrier transport of the MSHJ device. The interfacial oxide layer is regarded as two layers: a quasi p -type semiconductor interfacial oxide layer (SiOx(Mo))1 in which numerous negatively charged centers existed due to oxygen vacancies and molybdenum–ion-correlated ternary hybrids and a buffer layer (SiOx(Mo))2 in which the quantity of Si-O bonds was dominated by relatively good passivation. The thickness of (SiOx(Mo))1 and the thickness of (SiOx(Mo))2 were about 2.0 nm and 1.5 nm, respectively. The simulation results revealed that the quasi p -type layer behaved as a semiconductor material with a wide band gap of 2.30 eV, facilitating the transport of holes for negatively charged centers. Additionally, the buffer layer with an optical band gap of 1.90 eV played a crucial role in passivation in the MoOx/ n -Si devices. Furthermore, the negative charge centers in the interfacial layer had dual functions in both the field passivation and the tunneling processes. Combined with the experimental results, our model clarifies the interfacial physics and the mechanism of carrier transport for an MSHJ solar cell and provides an effective way to the high efficiency of MSHJ solar cells.
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