기계공학부 구성원들의 많은 관심과 참여 부탁드립니다.

▣ 제  목: Nanophotonic Structures for Spectral Tailoring: From Transparent Photovoltaics to Radiative Cooling
▣ 연  사: 강구민 박사

▣ 소  속: 한국과학기술연구원 

▣ 일  시: 2026. 5. 22.(Fri) 13:00

▣ 장  소: 제2공학관 B040호

▣ 초  록

Buildings consume a large fraction of global energy, motivating materials that can simultaneously harvest solar energy and reject unwanted heat. This seminar presents two complementary nanophotonic strategies that share a common principle: wavelength-selective control of light.

The first study introduces a hybrid solar window combining bifacial silicon solar cells with an optimized distributed Bragg reflector (DBR). The DBR selectively reflects NIR light (750–1,150 nm) onto the solar cells while transmitting visible light with minimal color distortion, achieving a PCE of 8.29%, AVT of 75.6%, CRI of 93.8, and a record light-utilization efficiency (LUE) of 6.27% — exceeding the theoretical limit of conventional transparent photovoltaics (Y. Kim et al., Joule 2025).

The second study develops a CYTOP-based passive daytime radiative cooling (PDRC) paint. CYTOP's C–F and C–O–C-only structure minimizes solar absorption while enabling selective thermal emission within the atmospheric window (8–13 µm). Combined with a nanovoid–Al2O3 dual-scatter nanostructure, the paint achieves Rsolar = 98.2% and εATW = 96.4% at just 80 µm thickness, delivering 5.4 °C subambient surface cooling with outstanding UV and soiling resistance (H. Park et al., J. Mater. Chem. A 2025).

Together, these works demonstrate that precision spectral engineering — harvesting invisible infrared light for power generation or radiating it for cooling — offers a unified pathway toward energy-efficient, sustainable buildings.