Abstract The poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and inverted pyramid n-silicon heterojunction solar cells have been extensively investigated based on their light trapping behaviour, rationally high efficiency and cost effectiveness. However, inferior junction conformity still remains a great challenge. In this work, we present the effect of passivation using aluminium oxide (Al2O3) on the front surface and titanium oxide (TiO2) on rear interface in the inverted pyramid -Si/PEDOT: PSS heterojunction solar cells using the atomic layer deposition technique. The front surface Al2O3 layer can enhance the surface energy, which generates the uniform coating of PEDOT:PSS, acting as an electron blocking layer. Furthermore, TiO2 thin layer deposited on rear interface works as a hole blocking layer, which can suppress the electrical losses and the charge recombination. The best cell demonstrated a conversion efficiency of 16.04% with an open-circuit voltage of 0.63 V, fill factor of 71.5% and a high current density of 35.45 mA/cm2. These findings suggest a promising approach to attainment of next-generation hybrid solar cells.

中文翻译：

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界面钝化对倒金字塔硅/聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）异质结太阳能电池的影响

摘要 聚（3,4-亚乙基二氧噻吩）聚苯乙烯磺酸盐 (PEDOT:PSS) 和倒金字塔 n 硅异质结太阳能电池因其光捕获行为、合理的高效率和成本效益而被广泛研究。然而，较差的连接整合仍然是一个巨大的挑战。在这项工作中，我们展示了在倒金字塔-Si/PEDOT 中使用前表面上的氧化铝 (Al2O3) 和后界面上的氧化钛 (TiO2) 钝化的效果：使用原子层沉积技术的 PSS 异质结太阳能电池。前表面 Al2O3 层可以增强表面能，从而产生 PEDOT:PSS 的均匀涂层，充当电子阻挡层。此外，沉积在后界面上的 TiO2 薄层用作空穴阻挡层，可以抑制电损耗和电荷复合。最佳电池的转换效率为 16.04%，开路电压为 0.63 V，填充因子为 71.5%，电流密度为 35.45 mA/cm2。这些发现为实现下一代混合太阳能电池提供了一种很有前景的方法。