Pohang University of Science and Technology · Energy
Professor Hyun Hwi Lee's research lab specializes in the fundamental understanding and engineering of organic semiconductor thin films, with a focus on molecular self-assembly, nanostructure evolution, and interfacial phenomena in organic heterojunction systems. The lab investigates the growth mechanisms and crystallographic transitions in materials such as ZnPc and its blends with C60, aiming to control nanoscale morphology for optoelectronic applications. Key research directions include strain-driven phase transitions, nanograin formation, and the development of high-performance organic photovoltaics and field-effect transistors.
Figures are computed from collected data and may differ slightly.
Abstract The initial growth modes of ZnPc films is examined, revealing the previously undescribed nanoscale crystal structure evolution and the nanograins of the ZnPc:C60 mixed layers in the thin films. Initially, the ZnPc molecules are stacked in the preferred γ(200) configuration, similar to the structures of CuPc. The ZnPc thin film growth display 2D planar to 3D island growth after the initial compressive strain had relaxed in films 7–8 MLs thick. 3D island formation decreases the prevalence
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