期刊
NANO ENERGY
卷 26, 期 -, 页码 595-602出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.06.015
关键词
Optically generated dipoles; Charge dissociation; Organic solar cells; Magneto-photocurrent; Dipole-dipole interaction
类别
资金
- Air Force Office of Scientific Research (AFOSR) [FA 9550-15-1-0064]
- National Science Foundation [CBET-1438181]
- Asian Office of Aerospace Research and Development (AOARD)
- Oak Ridge National Laboratory by the Division of Scientific User Facilities, U.S. Department of Energy [CNMS2012-106, CNMS2012-107, CNMS-2012-108]
- National Significant Program [2014CB643506, 2013CB922104]
- NSFC Program in China [61475051]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1438181] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1102011] Funding Source: National Science Foundation
Organic materials normally have low dielectric constants and are often formed with high electron-hole binding energy, which are detrimental to the generation of photovoltaic actions in solution-processing thin-film solar cells. Here, we show that optically induced dipole-dipole interaction can largely decrease the electron-hole binding energy at donor:acceptor (D:A) based on the PTB7:PCBM bulk-heterojunctions. Our experimental measurements combine (i) double-beam 325 nm and 532 nm excitations to establish dipole-dipole interaction by selectively exciting the intramolecular charge-transfer donor and optically polarizable acceptor and (ii) magneto-photocurrent to monitor the electron-hole binding energy through charge dissociation at D:A interfaces. We find that the electron-hole binding energy at D:A interfaces can be significantly decreased when the dipole-dipole interaction is optically established in PTB7:PCBM solar cells. Furthermore, the dipole-dipole interaction forms a drifting field to facilitate charge transport, and consequently enhancing the V, and FF in developing photovoltaic actions in organic solar cells. Published by Elsevier Ltd.
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