Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1669924 | Thin Solid Films | 2010 | 4 Pages |
Abstract
We investigated the influence of thermal annealing on the structural and optical properties of two variations of organic nanocomposite materials; 1) poly [3-hexylthiophene] and [6,6]-phenyl C61 butyric acid methyl ester ( P3HT:PC61BM), and 2) poly [3-hexylthiophene] and [6,6]-phenyl C71 butyric acid methyl ester) (P3HT:PC71BM). The evolution of surface roughness and morphology was investigated using atomic force microscopy while device electrical properties were investigated by measuring current-voltage (I-V) characteristics. Upon thermal treatment, results show that P3HT:PC71BM nanocomposites produce a more homogeneous mixture of finer grain size than P3HT:PC61BM. Furthermore, stronger optical absorption in the visible region is observed in P3HT:PC71BM compared to P3HT:PC61BM. Since optical absorption is closely related to film crystallinity, it is inferred that P3HT:PC71BM composites undergo more extensive crystallization upon annealing. Photoluminescence spectra of both P3HT:PC61BM and P3HT:PC71BM nanocomposites (dissolved in chlorobenzene) show that each has excellent quenching effects. I-V characteristic curves show that P3HT:PC71BM registers higher current density under AM 1.5 illumination than does P3HT:PC61BM. For the devices described in this paper having active areas of approximately 12Â mm2, efficiency is approximately 33% better for C71-based solar cells than that observed for devices made using C61 fullerene.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Patrick Boland, Sri Sabarinadh Sunkavalli, Sampath Chennuri, Kurniawan Foe, Tarek Abdel-Fattah, Gon Namkoong,