Interface engineering of perovskite solar cells with multifunctional polymer interlayer toward improved performance and stability
Interface engineering of perovskite solar cells with multifunctional polymer interlayer toward improved performance and stability
复制标题
具有多功能聚合物中间层的钙钛矿太阳能电池的界面工程，以提高性能和稳定性
DOI：
10.1016/j.jpowsour.2017.12.082
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发表时间：
2018-02-28
影响因子：
9.2
通讯作者：
Su, Cheng-Yong
中科院分区：
文献类型：
--
作者：
Huang, Li-Bo;Su, Pei-Yang;Su, Cheng-Yong
本文提出了一种新的钙钛矿太阳能电池结构，通过在钙钛矿和空穴传输材料（HTM）之间插入聚合物中间层，通过界面工程最小化界面损失。多功能中间层通过屏蔽钙钛矿的水分、抑制电荷组合和促进空穴传输来提高光伏效率和器件稳定性。利用五种不同的聚合物层，系统地研究了聚合物结构、层形态与电池性能的关系。研究发现，基于P3HT/spiro-OMeTAD复合结构实现了超过19.0%的可靠功率转换效率，超过了纯spiro-OMeTAD的15.0%。此外，有P3HT中间层的器件在受潮时比没有中间层的器件表现出更出色的长期稳定性。与其他聚合物相比，基于P3HT中间层的器件性能增强可归因于P3HT的长疏水烷基链和小分子单体，这有助于聚合物自组装成绝缘层，同时在聚合物/spiro-OMeTAD界面上形成高效的pi-pi堆叠。该研究为集成一类易于获取、溶液处理的新型界面聚合物材料提供了一条实用途径，可用于高性能和长期稳定的PSC。
This work proposes a new perovskite solar cell structure by inserting a polymer interlayer between perovskite and hole transporting material (HTM) to minimize the interface losses via interface engineering. The multifunctional interlayers improve the photovoltaic efficiency and device stability by shielding perovskite from moisture, suppressing charge combination, and promoting hole transport. The five different polymer layers are utilized to investigate the relationships of polymer structure, layer morphology and cell performance systematically. It is found that a reliable power conversion efficiency exceeding 19.0% is realized based on P3HT/spiro-OMeTAD composite structure, surpassing that of pure spiro-OMeTAD (15.0%). Moreover, the device with P3HT interlayer shows more brilliant long-term stability than that without interlayer when exposed into moisture. The enhanced device performance based on P3HT interlayer compared with the other polymers can be ascribed to the long hydrophobic alkyl chains and the small molecule monomers of P3HT, which contribute to self-assembly of the polymers into insulating layers and formation of the efficient pi-pi stacking in polymer/spiro-OMeTAD interface simultaneously. This study provides a practical route for the integration of a new class of easily accessible, solution-processed interfacial polymer materials for high-performance and long-time stable PSC.