混合自组装空穴传输单层能够同时提高钙钛矿太阳能电池的效率和稳定性,Solar RRL

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混合自组装空穴传输单层能够同时提高钙钛矿太阳能电池的效率和稳定性
Solar RRL ( IF 6.0 ) Pub Date : 2024-03-16 , DOI: 10.1002/solr.202400067
Do‐Ha Kim ₁ , Hyun‐Jung Lee ₁ , Sang‐Heon Lee ₁ , Yu‐Jin Kang ₂ , Sung‐Nam Kwon ₁ , Do‐Hyung Kim ₂ , Seok‐In Na ₁

Affiliation

作为实现高性能钙钛矿太阳能电池（PSC）的界面工程方法之一，具有空穴传输特性的自组装单层（SAM）最近被应用为减少空穴传输层能量损失的有效方法/钙钛矿界面，特别是在具有 p- i -n 结构的 PSC 中。然而，由于单个SAM的固有弱点，在实现高效率和高稳定性的PSC方面仍然存在局限性。在此，证明了混合自组装空穴传输单层与[2-(3,6-二甲氧基-9 H-咔唑-9-基)乙基]膦酸(MeO-2PACz)和[ 4-(3,6-二甲基-9 H-咔唑-9-基)丁基]膦酸(Me-4PACz)能够同时提高PSC的效率和稳定性。在混合SAM中，MeO-2PACz保持良好的润湿性以产生高质量的薄膜，而Me-4PACz的深层最高占据分子轨道优化了能级以实现有效的电荷转移，从而提高了PSC性能。令人鼓舞的是，Me-4PACz 缓解了 MeO-2PACz 的稳定性问题，产生了具有出色稳定性的基于 SAM 的混合 PSC。这些PSC的效率高达20.63%，并表现出优异的长期热稳定性，在N ₂气氛中65 °C约1400和2100小时后仍保留其初始效率的90%和80%。这些发现表明混合 SAM 方法在实现高性能 PSC 方面具有潜力。

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Mixed Self-Assembled Hole-Transport Monolayer Enables Simultaneous Improvement of Efficiency and Stability of Perovskite Solar Cells

As one of the interface engineering methods for realizing high-performance perovskite solar cells (PSCs), self-assembled monolayers (SAMs) with hole-transport properties have recently been applied as an effective way to reduce energy losses at the hole-transport layer/perovskite interface, especially in PSCs with p–i–n structure. However, there are still limitations in implementing PSC with high efficiency and high stability due to the inherent weaknesses of single SAMs. Herein, it is demonstrated that a mixed self-assembled hole-transport monolayer with an appropriate mixture of [2-(3,6-dimethoxy-9H-carbazol-9-yl)ethyl]phosphonic acid (MeO-2PACz) and [4-(3,6-dimethyl-9H-carbazol-9-yl)butyl]phosphonic acid (Me-4PACz) enables simultaneous improvement of efficiency and stability of PSCs. In the mixed SAM, MeO-2PACz maintains favorable wettability to produce high-quality films, while the deep highest occupied molecular orbital of Me-4PACz optimizes the energy level for efficient charge transfer, resulting in improved PSC performance. Encouragingly, Me-4PACz mitigates the stability issues of MeO-2PACz, producing mixed SAM-based PSCs with excellent stability. These PSCs achieve up to 20.63% efficiency and exhibit excellent thermal long-term stability, retaining 90% and 80% of their initial efficiency after approximately 1400 and 2100 h at 65 °C in an N₂ atmosphere. These findings suggest the potential of mixed SAM approaches for the realization of high-performance PSCs.

更新日期：2024-03-16

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