南京工业大学Tianshi Qin课题组在材料化学的研究中取得进展。他们的研究制备了用于高效稳定钙钛矿太阳能电池的自聚合螺旋型界面分子。相关论文发表在2024年2月26日出版的《德国应用化学》杂志上。

在这项研究中，该课题组人员成功地合成了一种新的自聚合螺旋型界面分子，称为v-螺旋。与螺-OMeTAD相比，线性排列的分子表现出更强的分子间相互作用和更高的固有空穴迁移率。重要的是，v-螺旋中的乙烯基可以实现原位聚合，在钙钛矿膜表面形成聚合物保护层，这在抑制水分降解和离子迁移方面非常有效。

利用这些优点，基于多晶硅的器件由于降低了缺陷密度、能级对准和高效的界面空穴提取，实现了24.54%的效率，具有提高的1.173 V的开路电压和81.11%的填充因子。此外，未封装器件的运行稳定性显著增强，即使在大约60%的湿度下工作2000小时或在持续的AM 1.5G阳光照射下工作1250小时后，初始效率仍保持在90%以上。这项工作提出了一种全面的方法，通过创新的界面设计来实现PSCs的高效率和长期稳定性。

据悉，在追求高效钙钛矿太阳能电池的过程中，螺-OMeTAD已经证明了创纪录的功率转换效率(PCEs)，然而，稳定性问题仍然是制约其商业发展的瓶颈之一。

附：英文原文

Title: Self-polymerized Spiro-Type Interfacial Molecule toward Efficient and Stable Perovskite Solar Cells

Author: Qiushuang Tian, Jingxi Chang, Junbo Wang, Qingyun He, Shaoyu Chen, Pinghui Yang, Hongze Wang, Jingya Lai, Mengyang Wu, Xiangru Zhao, Chongyu Zhong, Renzhi Li, Wei Huang, Fangfang Wang, Yingguo Yang, Tianshi Qin

Issue&Volume: 2024-02-26

Abstract: In the pursuit of highly efficient perovskite solar cells, spiro-OMeTAD has demonstrated recorded power conversion efficiencies (PCEs), however, the stability issue remains one of the bottlenecks constraining its commercial development. In this study, we successfully synthesize a novel self-polymerized spiro-type interfacial molecule, termed v-spiro. The linearly arranged molecule exhibits stronger intermolecular interactions and higher intrinsic hole mobility compared to spiro-OMeTAD. Importantly, the vinyl groups in v-spiro enable in-situ polymerization, forming a polymeric protective layer on the perovskite film surface, which proves highly effective in suppressing moisture degradation and ion migration. Utilizing these advantages, poly-v-spiro-based device achieves an outstanding efficiency of 24.54%, with an enhanced open-circuit voltage of 1.173 V and a fill factor of 81.11%, owing to the reduced defect density, energy level alignment and efficient interfacial hole extraction. Furthermore, the operational stability of unencapsulated devices is significantly enhanced, maintaining initial efficiencies above 90% even after 2000 hours under approximately 60% humidity or 1250 hours under continuous AM 1.5G sunlight exposure. This work presents a comprehensive approach to achieving both high efficiency and long-term stability in PSCs through innovative interfacial design.

DOI: 10.1002/anie.202318754

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202318754