摘要
We report the evidence of post-annealing-induced phase transition in zinc phthalocyanine (ZnPc) ultrathin (~20 nm) films upon annealing at 200 °C. The signatures of phase transition are observed in their morphological, structural, and ultrafast spectroscopic properties. X-ray diffraction measurement shows that a-phase nanospheres transform to β- phase nanorods that have a high degree of crystallinity with an excellent ordering along the cdirection in a monoclinic arrangement. Tight packing of molecules in the β-crystallites allows a red-shift and intensity gain of the lowest-energy subband in the Q-band and subsequently increases the electronic coupling in both intercolumn and intracolumn paths.
原文 | English |
---|---|
頁(從 - 到) | 3586-3593 |
頁數 | 8 |
期刊 | Optical Materials Express |
卷 | 6 |
發行號 | 11 |
DOIs | |
出版狀態 | Published - 2016 |