Investigation of nanoscale morphological changes in organic photovoltaics during solvent vapor annealing
Investigation of nanoscale morphological changes in organic photovoltaics during solvent vapor annealing
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DOI：
10.1039/b713926h
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发表时间：
2008-01-01
影响因子：
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通讯作者：
Chhowalla, Manish
中科院分区：
文献类型：
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作者：
Miller, Steve;Fanchini, Giovanni;Chhowalla, Manish
本文报道了有机聚（3-己基噻吩）（P3HT）和苯基- c -61-丁酸甲酯（PCBM）器件在室温下暴露于溶剂蒸气中提高光伏效率的方法。原位光致发光（PL）和拉曼光谱，结合非原位光学吸收和原子力显微镜，已经被用来深入了解溶剂蒸汽退火过程中发生的纳米级形态变化。我们发现，在P3HT: PCBM的1:1复合材料中，在溶剂蒸汽退火过程中观察到PL被抑制，P3HT的1442 cm（-1）拉曼峰的线宽变窄，光学吸收光谱发生了强烈的变化，而纯P3HT薄膜的变化很小。我们将这些光谱变化归因于PCBM的脱混和随后P3HT在共面共轭段中的堆叠，类似于在热退火过程中观察到的情况。
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.