使用微图案化Al2O3层设计与制备类PERC CdTe太阳能电池
Design and Fabrication of PERC-Like CdTe Solar Cells Using Micropatterned Al2O3 Layer
AI总结：
本研究通过激光束光刻在CdTe表面制备微图案化Al2O3钝化层，构建了类PERC太阳能电池，分析了图案化结构对Voc、Jsc和FF的不同影响及潜在机制。
摘要：
近期研究探索了通过提高CdTe薄膜的载流子寿命和掺杂密度，来进一步改善CdTe太阳能电池有限Voc的新策略。在各种金属氧化物中，氧化铝（Al2O3）是一种极具前景的钝化候选材料，带负电的Al2O3层会排斥CdTe中的少数载流子，且Al2O3提供化学钝化界面，从而增加载流子寿命。尽管不断努力，一种既能提高Voc又能保持高Jsc和FF的优化背接触架构仍在开发中。在本工作中，我们报告了类PERC CdTe太阳能电池的设计、制备和表征，其中使用激光束光刻对Al2O3钝化层进行图案化。我们的工艺能够在粗糙的CdTe表面上实现可复现的图案化，同时保持设计中的阵列尺寸。对CdTe PERC器件（As掺杂）的分析表明，与FF和Jsc相比，Voc呈现出显著不同的趋势，这与本研究中使用的图案化阵列结构无关。CdTe的次表面电子结构以及图案化Al2O3的载流子选择性与收集之间的相互作用，可能是导致所观察到的光伏特性的原因。
英文摘要：
Recent studies have investigated novel strategies to further improve the limited Voc of CdTe solar cells via increased carrier lifetime and doping density of CdTe thin films. Among various metal oxides, aluminum oxide (Al2O3) is a promising passivation candidate, where the negatively charged Al2O3 layer repels the minority carrier in CdTe and Al2O3 provides a chemically passivating interface, increasing the carrier lifetime. Despite the continuing efforts, an optimized back-contact architecture to improve the Voc while maintaining high Jsc and FF is still under development. In this work, we report the design, fabrication, and characterization of PERC-like CdTe solar cells, where an Al2O3 passivation layer is patterned using laser-beam lithography. Our process enables reproducible patterning on a rough surface CdTe while maintaining the size of the array in the design. Analysis of CdTe PERC devices (As-doped) shows a notably different Voc trend compared to FF and Jsc, independent of the patterned array structures used in this study. The subsurface electronic structure of CdTe and the interplay between carrier selectivity and collection of the patterned Al2O3 could be responsible for the observed PV characteristics.
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