Zhu Yayun, Deng Kaimo, Sun Haoxuan, Gu Bangkai, Lu Hao, Cao Fengren, Xiong Jie, Li Liang
College of Physics, Optoelectronics and Energy Jiangsu Key Laboratory of Thin Films Center for Energy Conversion Materials & Physics (CECMP) Soochow University Suzhou 215006 P. R. China.
State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 P. R. China.
Adv Sci (Weinh). 2018 Jan 6;5(3):1700614. doi: 10.1002/advs.201700614. eCollection 2018 Mar.
In the planar perovskite solar cells (PSCs), the electron transport layer (ETL) plays a critical role in electron extraction and transport. Widely utilized TiO ETLs suffer from the low conductivity and high surface defect density. To address these problems, for the first time, two types of ETLs based on TiO phase junction are designed and fabricated distributed in the opposite space, namely anatase/rutile and rutile/anatase. The champion efficiency of PSCs based on phase junction ETL is over 15%, which is much higher than that of cells with single anatase (9.8%) and rutile (11.8%) TiO as ETL. The phase junction based PSCs also demonstrated obviously reduced hysteresis. The enhanced performance is discussed and mainly ascribed to the excellent capability of carrier extraction, defect passivation, and reduced recombination at the ETL/perovskite interface. This work opens a new phase junction ETL strategy toward interfacial energy band manipulation for improved PSC performance.
在平面钙钛矿太阳能电池（PSC）中，电子传输层（ETL）在电子提取和传输中起着关键作用。广泛使用的TiO电子传输层存在导电性低和表面缺陷密度高的问题。为了解决这些问题，首次设计并制备了两种基于TiO相结的电子传输层，它们分布在相反的空间中，即锐钛矿/金红石和金红石/锐钛矿。基于相结电子传输层的PSC的最高效率超过15%，远高于以单一锐钛矿（9.8%）和金红石（11.8%）TiO作为电子传输层的电池。基于相结的PSC还表现出明显降低的滞后现象。对性能增强进行了讨论，主要归因于载流子提取、缺陷钝化以及ETL/钙钛矿界面处复合减少的优异能力。这项工作开启了一种新的相结电子传输层策略，用于界面能带调控以提高PSC性能。
Zotero 插件
