Abstract
Free-standing films of metal octaethylporphyrins (MOEPs) were prepared for the first time by a physical vapor deposition on surface of an ionic liquid (IL). Different from those on solid surfaces, the as-obtained films were very compact and with plannar structure. The monitoring of time-dependent process indicated that the high surface energy of IL and the strong π…π interaction between MOEP molecules played key roles in forming such films. Furthermore, the as-obtained film showed good transferability, which made it possible to be easily transferred to any substrates for further device application. More importantly, the prototype photodetectors based on free-standing films of MOEP showed ultra flexibility, mechanical stability, and durability.
Highlights
Ordered crystalline films of organic semiconductors are one of the most important elements in high-performance optical and electronic devices[1, 2]
Znic octaethylphorphyrin (ZnOEP) was hereinafter selected as a representative molecule to illustrate the morphology, structure, and growth mechanism of free-standing films
The diffraction peaks of (01–1) planes of the film are significantly enhanced relative to the ZnOEP powder. These results indicate that the film is highly crystalline and the preferential growth orientation is perpendicular to (01–1) plane
Summary
Ordered crystalline films of organic semiconductors are one of the most important elements in high-performance optical and electronic devices[1, 2]. Free-standing films can be transferred onto the desired substrate to produce the final devices[3]. Such device assembling process can decrease remarkably the cost without sacrificing the device performance. The products in previous studies are dispersed in ILs, and no continuous films are formed It was because the hard control of the delicate balance of surface energy, interfacial energy and interaction between the target molecules. Free-standing films of metaloctaethylporphyrins (MOEPs) are directly grown for the first time by a PVD process on surface of an IL, which has higher density than MOEPs and is insoluble with MOEPs. The targeted MOEPs were well-known macrocyclic complexes and widely used in various fields such as chemistry, physics, biology, medicine, and device. The prototype photodetectors based on these films showed excellent flexibility, mechanical stability, and durability
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