期刊
NANO ENERGY
卷 21, 期 -, 页码 26-38出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.01.003
关键词
Polymer solar cells; Polyelectrolytes; Interlayers; Interfacial dipoles; Doping
类别
资金
- Pioneer Research Center Program [NRF-2013M3C1A3065528]
- Basic Science Research Program through National Research Foundation of Korea (NRF) grant - Ministry of Science, ICT & Future Planning (MSIP) [2013R1A1A1011880]
- National Research Foundation of Korea [2013R1A1A1011880] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We perform a comprehensive study to achieve better polyelectrolytes (PEs) as electron transport layers (ETLs) in polymer solar cells (PSCs). Three well-known PEs - PFN, PETE, and WPF - are chosen as model systems and investigated with variations in their backbone structures and the state of the amine functionalities on their side chains. Respectively optimized PSCs using the three PEs exhibit different cell-performances, mainly owing to the diode characteristics of built-in potential and recombination strength. To identify how such deviated device performances correlate with the structural features of PEs, the modulated interfaces of ITO/PEs and PEs/active layer are studied in detail. It is found that conjugated backbones and larger counter-anions on side chains can promote the modulation of ITO work functions (WFs) and that a large amount of protonated amines on PEs is beneficial for junction properties with a subsequent active layer. Additionally, our results indicate that interfacial dipole and electrical doping between the PE and active layer, in addition to WF modulation of the ITO cathode, are important for device efficiency. Accordingly, with the aid of the molecular features of PEIE, PEIE-PSCs exhibit excellent device efficiency and stability compared with PFN- and WPF-PSCs. In the PTB7-th:PC71BM system, a remarkable power-conversion efficiency of 9.97% is achieved with a single PEIE ETL. (C) 2016 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据