Cho, Yong Jae Lee, Chihyung Kang, Hyeong Cheol Kim, Byunghoon Kim, Gyu-Hee Kang, Gumin Ryu, Junyeong Yoo, Kicheon Park, Gi Soon Lee, Kyu-Tae Min, Byoung Koun Lee, Jae-Joon Ko, Doo-Hyun 2024-01-19T10:00:07Z 2024-01-19T10:00:07Z 2023-04-06 2023-04 1385-8947 https://pubs.kist.re.kr/handle/201004/113869 Quantum dots (QDs) have been regarded as promising spectral converters for photovoltaic (PV) devices owing to their excellent photoluminescence (PL) characteristics. Herein, we report a highly-efficient QD hierarchical (QD-Hie) film that elevates the PV performance by integrating QDs with micro/nano hierarchical structures. The proposed film was designed to ensure low reflectance for incident light (air-to-device) and high reflectance for escape light (device-to-air), obtaining a light-trapping effect to increase the absorption of PVs at wide incident angles. The trapped ultraviolet photons in our film promoted the downshifting property of the QDs and amplified the generation of visible photons, thereby enhancing the PL characteristics of QDs up to 3.71 times with inde-pendency of the incidence angle. Furthermore, the hierarchical structure restricts the outward release of con-verted QDPL, ensuring high availability of the down-shifted photons to PVs. The optical benefit of our film was maximized by attaching them on both sides of bifacial semi-transparent dye-sensitized solar cells, resulting in the short-circuit current density (JSC) improvement of up to 25.97% under AM 1.5G illumination. Along with its high versatility and outstanding JSC increments, our study presents a new perspective of advanced spectral converting layers and provides practical viability for various optoelectronic devices. English Elsevier BV Optically asymmetric down-shifting films for highly efficient photovoltaics Article 10.1016/j.cej.2023.142153 1 Chemical Engineering Journal, v.462 Chemical Engineering Journal 462 N scie scopus 000949983000001 2-s2.0-85149214996 Engineering, Environmental Engineering, Chemical Engineering Article EXTERNAL QUANTUM EFFICIENCY SILICON SOLAR-CELLS SPECTRAL RESPONSE LUMINESCENT LAYER DOTS ENHANCEMENT MODULES Hierarchical photonic structure Photovoltaic Luminescent downshifting Light trapping Optical asymmetry