北京理工大学姜岩研究团队报道了π共轭诱导的Spiro-OMeTAD原位纳米有序结构，提高钙钛矿太阳能电池的效率和稳定性。相关研究成果发表在2024年10月24日出版的《美国化学会杂志》。

Spiro OMeTAD空穴传输材料在钙钛矿太阳能电池中通常非晶态为。然而，结构有序性的缺乏导致分子间相互作用较弱，载流子转移较差，器件稳定性差。

该文中，研究人员开发了一种π共轭诱导的短程有序策略，以调节螺环OMeTAD在成膜过程中的堆叠顺序。在纳米尺度上观察到清晰的分子有序性，这增强了螺环OMeTAD中的分子间π-π堆叠，并实现了有效的载流子提取和良好的能级排列。

纳米级有序螺环OMeTAD可以制备25.37%的冠军效率的钙钛矿太阳能电池，超过了使用非晶螺环OMeToD的装置（23.52%）。未封装的器件在60°C下连续1个标准等效光照840小时后，保持了98%的初始效率，从而增强了操作稳定性。

该项工作为有机传输材料的堆叠顺序建立了一个重要而有效的调制概念，为开发高效稳定的钙钛矿太阳能电池铺平了道路。

附：英文原文

Title: π-Conjugation-Induced In Situ Nanoscale Ordering of Spiro-OMeTAD Boosts the Efficiency and Stability of Perovskite Solar Cells

Author: Tao Zhao, Xi Jin, Ming-Hua Li, Jun Li, Sunfa Wang, Zhongyang Zhang, Peng Sun, Shiju Lin, Qi Chen, Jin-Song Hu, Yao Li, Yan Jiang

Issue&Volume: October 24, 2024

Abstract: Spiro-OMeTAD hole transport materials typically exhibit an amorphous state in perovskite solar cells. However, the lack of structural ordering leads to weak intermolecular interaction, inferior carrier transfer, and poor stability in devices. Herein, we developed a π-conjugation-induced short-range ordering strategy to modulate the stacking order of spiro-OMeTAD during film formation. A clear molecular ordering at the nanoscale is observed, which enhances intermolecular π–π stacking in spiro-OMeTAD and enables effective carrier extraction and favorable energy level alignment. The nanoscale-ordered spiro-OMeTAD allows the achievement of perovskite solar cells with a champion efficiency of 25.37%, surpassing devices utilizing amorphous spiro-OMeTAD (23.52%). The unencapsulated device demonstrates enhanced operational stability by retaining 98% of its initial efficiency under continuous 1 sun equivalent illumination at 60 °C for 840 h. This work establishes a significant and valid modulation concept for the stacking order of organic transport materials, paving the way for the development of efficient and stable perovskite solar cells.

DOI: 10.1021/jacs.4c09094

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.4c09094