X-ray spectromicroscopy of polymer/fullerene composites: Quantitative chemical mapping

被引：53

作者：

McNeill, Christopher R.

Watts, Benjamin

Thomsen, Lars

Belcher, Warwick J.

Kilcoyne, A. L. David

Greenham, Neil C.

Dastoor, Paul C.

机构：

[1] Univ Cambridge, Cavendish Lab, Dept Phys, Cambridge CB3 0HE, England

[2] Univ Newcastle, Sch Math & Phys Sci, Callaghan, NSW 2308, Australia

[3] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

[4] Univ Calif Berkeley, Lawrence Berkeley Lab, ALS, Berkeley, CA 94720 USA

来源：

SMALL | 2006年 / 2卷 / 12期

关键词：

fullerenes; phase morphology; polymer blends; solar cells; X-ray microscopy;

D O I：

10.1002/smll.200600300

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Scanning transmission X-ray microscopy (STXM) was used to provide the first quantitative nanoscale chemical maps of a conjugated polymer/methanofullerene blend. STXM technique utilized a variable energy X-ray beam with a spot size of 50 nm or smaller to probe the bulk chemical composition of thin films. Chemical contrast was obtained from differences in the near-edge X-ray absorption fine structure (NEXAFS) carbon K-edge spectra. The chemical composition was also determined along a line profile by taking a full NEXAFS spectrum at a succession of points, which was then fitted with a weighted sum of pristine spectra. It was observed that (6,6)-phenyl-C61-butyric acid (PCBM) domain plays an important role in device performance by determining whether or not photoabsorption by the PCBM is able to contribute to the overall photocurrent. Short-circuit photocurrent spectra revealed an enhanced contribution by PCBM in chlorobenzene devices.

引用

页码：1432 / 1435

页数：4

共 25 条

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