Cheng Haoliang, Li Yaru, Zhao Guanyu, Zhao Ke, Wang Zhong-Sheng
Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) , Fudan University , 2205 Songhu Road , Shanghai 200438 , China.
ACS Appl Mater Interfaces. 2019 Aug 14;11(32):28960-28967. doi: 10.1021/acsami.9b09530. Epub 2019 Jul 31.
To engineer the NiO/perovskite interface and promote interfacial hole transfer, two pyridine-terminated conjugated small organic molecules (PTZ-1 and PTZ-2) are synthesized to link the NiO and perovskite layers for NiO-based perovskite solar cells (PSCs). One terminal pyridine group interacts with the NiO layer, while the other one coordinates with the Pb atoms of the perovskite layer, erecting an interfacial hole transfer bridge between NiO and perovskite. Surface modification of the NiO film with the PTZ molecules is able to enhance hole extraction, increase hole mobility and conductivity of NiO, reduce defect density, and retard interfacial charge recombination. As a consequence, power conversion efficiency is improved from 12.53 to 16.25 and 17.00% upon surface modifications of NiO with PTZ-1 and PTZ-2, respectively. Furthermore, the modified PSCs exhibit almost no hysteresis and show good stability after storage in air (relative humidity of 30-40%) for 500 h without encapsulation.
为了构建氧化镍/钙钛矿界面并促进界面空穴转移，合成了两种吡啶端基共轭小分子（PTZ-1和PTZ-2），用于连接氧化镍和钙钛矿层，以制备基于氧化镍的钙钛矿太阳能电池（PSC）。一个端基吡啶基团与氧化镍层相互作用，而另一个与钙钛矿层的铅原子配位，在氧化镍和钙钛矿之间搭建起界面空穴转移桥梁。用PTZ分子对氧化镍薄膜进行表面修饰能够增强空穴提取能力，提高氧化镍的空穴迁移率和电导率，降低缺陷密度，并延缓界面电荷复合。结果，在用PTZ-1和PTZ-2分别对氧化镍进行表面修饰后，功率转换效率从12.53%提高到了16.25%和17.00%。此外，经过修饰的PSC几乎没有滞后现象，在未封装的情况下于空气中（相对湿度30 - 40%）储存500小时后仍表现出良好的稳定性。
