POS5-0082
Isotropic Nanomanufacturing of 3D Curvilinear Optoelectronics via Deterministic Chaos-Driven Gyroscopic Thermal Evaporation
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
TAEK MIN KIM (POSTECH)
Co-Author(s)
Abstract
This study proposes Gyroscopic Thermal Evaporation (GTE) as a transformative 3D nanomanufacturing platform that overcomes the fundamental geometric shadowing effects and thin-film anisotropies inherent in conventional vacuum processes on curvilinear substrates. By integrating a three-axis gimbal system with intentional asymmetric counterweights, we generate non-diagonal components in the inertia tensor to induce inter-axis torque coupling and deterministic chaos, ensuring a mathematically ergodic deposition trajectory that achieves ultra-uniform coatings (RSD < 5%) even on high-curvature spherical targets. Notably, the GTE system maintains the ‘fixed source and rotating target’ configuration of standard vacuum thermal evaporation (VTE), allowing for the seamless and cost-effective application of existing industrial infrastructure to 3D device fabrication. Utilizing this universal platform, we successfully demonstrated hemispherical organic photodetectors (OPDs) with a 180° field of view, achieving a low dark current of 10-9 A/cm² and a detectivity of 1012 Jones, while effectively mitigating cosine losses by over 70%. Furthermore, the implementation of spherical organic solar cells (OSCs) confirms that GTE is a pivotal core technology for future 3D optoelectronics, offering a versatile manufacturing route for omnidirectional energy-harvesting and biomimetic sensing systems across diverse material sets, including metals, oxides, and organic small molecules.
