期刊
CHEMISTRY OF MATERIALS
卷 25, 期 15, 页码 3188-3195出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm401586t
关键词
selenium; conjugated polymers; ladder-type polymers; organic photovoltaics; organic field-effect transistors; density functional theory
资金
- Air Force Office of Scientific Research [FA9550-09-1-0426]
- Asian Office of Aerospace RD [FA2386-11-1-4072]
- Office of Naval Research [N00014-11-1-0300]
- Boeing Foundation
Selenium substitution on a ladder-type indacenodithiophene-based polymer (PIDT-DFBT) is investigated in order to reduce band gap, improve charge mobilities, and enhance the photovoltaic performance of the material. The new indacenodiselenophene-based polymer (PIDSe-DFBT) possessed improved absorption over its sulfur analogue in films, as well as substantially higher charge mobilities (0.15 and 0.064 cm(2)/(V s) hole and electron mobility, respectively, compared to 0.002 and 0.008 cm(2)/V s) for PIDT-DFBT). The enhanced material properties led to an improved power conversion efficiency of 6.8% in photovoltaic cells, a 13% improvement over PIDT-DFBT-based devices. Furthermore, we examined the effect of molecular weight on the properties of PIDSe-DFBT and found not only a strong molecular weight dependence on mobilities, but also on the absorptivity of polymer films, with each 15 000 g/mol increase in weight, leading to a 25% increase in the absorptivity of the material. The molecular weight dependence of the material's properties resulted in a significant difference in photovoltaic performance with the high-molecular-weight PIDSe-DFBT providing a higher photocurrent, fill factor, and efficiency due to its improved absorption and hole mobility. These results demonstrate the importance of achieving high molecular weight and the potential that selenium-containing ladder-type polymers have in the design of high-performance semiconducting polymers for organic photovoltaics (OPVs).
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