Kyung Hee University · Engineering
Professor Sang Hyuk Im's research lab specializes in the development of advanced materials and devices for renewable energy applications, with a primary focus on high-efficiency, stable perovskite and chalcogenide-based solar cells. The lab explores innovative synthesis methods—such as atomic layer deposition and spray pyrolysis—for creating high-quality, defect-minimized semiconductor absorbers like Sb₂S₃ and TiO₂ nanotubes. Key research directions include interface engineering using conjugated polymers and nonfullerene electron transport materials, particularly naphthalene diimide derivatives, to enhance device performance and stability. The lab also investigates the controlled synthesis of noble metal nanostructures, such as single-crystal silver nanocubes, through selective etching strategies.
Figures are computed from collected data and may differ slightly.
One lump or two! Selective etching of twinned seeds, mediated by HCl and the oxygen in air, resulted in high yields of perfect single-crystal silver nanocubes in a range of sizes (30–130 nm). The chloride ion enhances oxidation and prevents aggregation, while the proton decreases the rate of reduction and facilitates etching through the formation of nitric acid.
Sb(2)S(3)-sensitized mesoporous-TiO(2) solar cells using several conjugated polymers as hole-transporting materials (HTMs) are fabricated. We found that the cell performance was strongly correlated with the chemical interaction at the interface of Sb(2)S(3) as sensitizer and the HTMs through the thiophene moieties, which led to a higher fill factor (FF), open-circuit voltage (V(oc)), and short-circuit current density (J(sc)). With the application of PCPDTBT (poly(2,6-(4,4-bis-(2-ethylhexyl)-4H-c
A high-quality Sb₂S₃ thin-absorber with controllable thickness was reproducibly formed by atomic layer deposition (ALD) technique. Compared with conventional chemical bath deposition (CBD), the Sb₂S₃ absorber deposited by ALD did not contain oxide or oxygen impurities and showed a very uniform thickness of Sb₂S₃ absorbers formed on a rough surface of dense blocking TiO₂/F-doped SnOv (bl-TiO₂/FTO) substrate. The planar ALD-Sb₂S₃ solar cells comprised of Au/Poly-3-hexylthiophene/ALD-Sb₂S₃/bl-TiO₂/
Ein Stück oder zwei! Durch selektives Ätzen verzwillingter Keime, das durch HCl und Luftsauerstoff vermittelt wird, sind perfekte einkristalline Silbernanowürfel in hohen Ausbeuten und unterschiedlichen Größen (30–130 nm) zugänglich. Das Chloridion verstärkt die Oxidation und verhindert die Aggregation, das Proton verringert die Reduktionsgeschwindigkeit und erleichtert den Ätzvorgang durch Bildung von salpetriger Säure. Supporting information for this article is available on the WWW under http:
In the present work we report on an investigation of TiO(2) nanotube arrays sensitized by low band-gap materials, such as CdS and CdSe, prepared by the one-step spray pyrolysis deposition method, which is very suitable for mass production, and their performance in photoelectrochemical cells.
Abstract This study reports a new nonfullerene electron transporting material (ETM) based on naphthalene diimide (NDI) small molecules for use in high‐performance perovskite solar cells (PSCs). These solar cells simultaneously achieve high power conversion efficiency (PCE) of over 20% and long‐term stability. New NDI‐ID ( N , N′ ‐Bis(1‐indanyl)naphthalene‐1,4,5,8‐tetracarboxylic diimide) consisting of an N ‐substituted indane group having simultaneous alicyclic and aromatic characteristics is sy
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