کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
79644 | 49362 | 2011 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Polymeric solar cells based on P3HT:PCBM: Role of the casting solvent Polymeric solar cells based on P3HT:PCBM: Role of the casting solvent](/preview/png/79644.png)
Polymeric photovoltaic (PV) solar cells have been fabricated using six solvents: chloroform (CHCl3), toluene (T), chlorobenzene (CB), orthodichlorobenzene (ODCB), 1,2,3,4-tetrahydronaphthalene (THN) and 1,2,4-trichlorobenzene (TCB). The active layers were composed of poly(3-hexyl)thiophene (P3HT) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM). Special care has been taken to keep all experimental parameters constant (thickness of the active layers, donor/acceptor weight ratio, area of active surface and electrodes) in order to avoid artefacts and truly study the effect of solvents. Studies using atomic force microscopy (AFM) and optical absorption (UV–vis) showed the relationship between the photovoltaic performance and the evaporation rate of solvents. The use of solvents with high boiling point results in a higher degree of organization in the structure of P3HT. A direct comparison with devices processed with thermal treatment has also been performed. As often reported thermal annealing increases photo-conversion efficiency of devices created from common solvents, due to better separation of phase between the two materials of the blend. In the case of solvents with high boiling point such as THN and TCB, neither phase separation nor modification of P3HT crystallization induced by thermal annealing has been observed. However thermal treatment appears to enhance performance, ensuing the evaporation of remaining solvent in the active layers. An overview of the effect of solvent on the electrical properties of films containing pure P3HT and P3HT:PCBM blend reported in the literature has been completed for the discussion.
Figure optionsDownload as PowerPoint slideHighlights
► Various solvents used for solution processing of P3HT:PCBM-based PSCs.
► High boiling point solvents enable spontaneous optimum P3HT :PCBM phase separation.
► Tetrahydronaphthalene is a promising chloride-free solvent for PSCs manufacturing.
Journal: Solar Energy Materials and Solar Cells - Volume 95, Issue 12, December 2011, Pages 3408–3418