Morphological study of P3HT:PCBM blend films prepared through solvent annealing for solar cell applications

We have systematically investigated the morphology of poly(3-hexylthiophene; P3HT) and [6,6]-phenyl C 61-butyic acid methyl ester (PCBM) blend films prepared through a slow growth apparoch as a function of PCBM loading in the blends for bulk heterojunction solar cells. In addition to the electrical...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2010-12, Vol.94 (12), p.2426-2430
Main Authors: Chen, Fang-Chung, Ko, Chu-Jung, Wu, Jyh-Lih, Chen, Wei-Chi
Format: Article
Language:English
Subjects:
Annealing
Applied sciences
Blends
Energy
Exact sciences and technology
Morphology
Natural energy
Order disorder
Photovoltaic cells
Photovoltaic conversion
Polymer
Solar cell
Solar cells
Solar cells. Photoelectrochemical cells
Solar energy
Solvent
Solvents
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Summary:We have systematically investigated the morphology of poly(3-hexylthiophene; P3HT) and [6,6]-phenyl C 61-butyic acid methyl ester (PCBM) blend films prepared through a slow growth apparoch as a function of PCBM loading in the blends for bulk heterojunction solar cells. In addition to the electrical characterisitcs, the molecular ordering and crystallinity of the polymers was examined by using the UV–vis spectroscopy and grazing incidence X-ray diffraction. From the images of confocal laser scan microscopy, we were also able to in-situ monitor the phase separation of the P3HT:PCBM blends during the process of solvent evaporation. Finally, the conductive atomic force microscopy was utilized to probe the spatial distribution of the local current across the photoactive layer prepared with various P3HT:PCBM ratios. From the experimental results, we found that the distribution of PCBM molecules in the P3HT matrix became homogeneous after the solvent annealing process, even though the distribution of the PCBM molecules was not even in the beginning. Therefore, the higher device efficiency could be attributed to the better thin-film morphology of the polymer blends.
ISSN:0927-0248
1879-3398
DOI:10.1016/j.solmat.2010.09.004