Investigation of nanoscale morphological changes in organic photovoltaics during solvent vapor annealing

被引：270

作者：

Miller, Steve ^{[1
]}

Fanchini, Giovanni ^{[1
]}

Lin, Yun-Yue ^{[2
]}

Li, Cheng ^{[3
]}

Chen, Chun-Wei ^{[2
]}

Su, Wei-Fang ^{[2
]}

Chhowalla, Manish ^{[1
]}

机构：

[1] Rutgers State Univ, Piscataway, NJ 08854 USA

[2] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei 10764, Taiwan

[3] New Jersey Inst Technol, Dept Chem & Environm Sci, Newark, NJ 07102 USA

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2008年 / 18卷 / 03期

关键词：

D O I：

10.1039/b713926h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Improvement of the photovoltaic efficiency via exposure of organic poly(3-hexylthiophene) (P3HT) and phenyl-C-61-butyric acid methyl ester (PCBM) devices to solvent vapor at room temperature is reported. In situ photoluminescence (PL) and Raman spectroscopy, in conjunction with ex situ optical absorption and atomic force microscopy, have been used to provide insight into the nanoscale morphological changes occurring during solvent vapor annealing. We found that in 1 : 1 composites of P3HT : PCBM, suppression of PL, narrowing in line-width of the 1442 cm(-1) P3HT Raman peak, and strong modifications in the optical absorption spectra were observed during solvent vapor annealing, while minimal changes occurred in pure P3HT films. We attribute these spectral modifications to de-mixing of PCBM and subsequent stacking of P3HT in coplanar conjugated segments, similar to what is observed during thermal annealing.

引用

页码：306 / 312

页数：7

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