http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Multipositional Silica-Coated Silver Nanoparticles for High-Performance Polymer Solar Cells
Choi, Hyosung,Lee, Jung-Pil,Ko, Seo-Jin,Jung, Jae-Woo,Park, Hyungmin,Yoo, Seungmin,Park, Okji,Jeong, Jong-Ryul,Park, Soojin,Kim, Jin Young American Chemical Society 2013 Nano letters Vol.13 No.5
<P>We demonstrate high-performance polymer solar cells using the plasmonic effect of multipositional silica-coated silver nanoparticles. The location of the nanoparticles is critical for increasing light absorption and scattering via enhanced electric field distribution. The device incorporating nanoparticles between the hole transport layer and the active layer achieves a power conversion efficiency of 8.92% with an external quantum efficiency of 81.5%. These device efficiencies are the highest values reported to date for plasmonic polymer solar cells using metal nanoparticles.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2013/nalefd.2013.13.issue-5/nl400730z/production/images/medium/nl-2013-00730z_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl400730z'>ACS Electronic Supporting Info</A></P>
Eco-Friendly Photovoltaics Based on Stabilized AgBiS2 Nanocrystal Inks
Hyosung Choi(최효성) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
We first report that long-chain ligands of AgBiS2 NCs are replaced with halometallate-based short ligands via solution-phase ligand exchange (SPLE). AgI and BiI3 are used as halometallate sources, and we find that colloidally stable, highly concentrated AgBiS2 NC inks in polar solvents are prepared via SPLE using AgI-based halometallates, enabling one-step deposition suitable for roll-to-roll process. This leads to higher degree of ligand exchange, sharper bandtail, lower trap density, and resultantly higher VOC in devices compared to conventional SSLE. We also first demonstrate that the photovoltaic performance can be improved by introducing ethanedithiol-exchanged AgBiS2 NCs on SPLE-prepared AgBiS2 NC solids because of favorable band alignment and extended depletion width. Thus, this enables improving device performance up to a power conversion efficiency of 4.08% with the highest VOC of 0.55 V among the AgBiS2 NC photovoltaics reported so far.
A convenient platform for real‐time non‐contact thermal measurement and processing
Choi Hyosung,Soeriawidjaja Banyu Firdaus,Lee Sang Hak,Kwak Minseok 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.6
Temperature is one of crucial and integral parts of chemical experiments. Since the properties or shape of the material may change depending on the temperature, the device that measures it plays a vital role in an experiment. Such devices commonly used in experiments to this day are unable to perform temperature measurement and data processing simultaneously. Here, we present a low-price, non-contact convenient platform capable of solving both problems at the same time, with automatically set different measurement time intervals for each experiment, and shows processed data anywhere real-time on the Internet. This device can operate within temperature range of 20 and 80 C with a respectable error range of 2.5 C.
Choi, Hyosung,Kim, Hak-Beom,Ko, Seo-Jin,Kim, Gi-Hwan,Kim, Jin Young American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.9
<P>We investigate a simple fabrication method for vapor coating small-molecule organic interlayers as replacements for metal oxide films. The interfacial layers, which serve both as both surface modifiers to reduce the substrate work function and electron selective layers, maximize light absorption within the active layer while improving electron transport and compatibility between the active layer and cathode, leading to a ∼22% enhancement in power conversion efficiency and similar air stability compared to devices using a ZnO layer.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-9/am500092a/production/images/medium/am-2014-00092a_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am500092a'>ACS Electronic Supporting Info</A></P>
Choi, Hyosung,Park, Ji Sun,Jeong, Eunjae,Kim, Gi‐,Hwan,Lee, Bo Ram,Kim, Sang Ouk,Song, Myoung Hoon,Woo, Han Young,Kim, Jin Young WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.24
<P><B>Interface engineering by combination of TiO<SUB>x</SUB> and a conjugated polyelectrolyte as an electron transport layer</B> modifies the electrical contact between a metal electrode and an organic active layer with well‐aligned frontier orbital energy levels for efficient charge transport. This results in remarkable improvements in the device performance of inverted polymer solar cells and polymer light‐emitting diodes.</P>
Choi, Hyosung,Cho, Heesook,Song, Suhee,Suh, Hongsuk,Park, Soojin,Kim, Jin Young Royal Society of Chemistry 2010 Physical chemistry chemical physics Vol.12 No.46
<P>We demonstrate the fabrication of a nanoporous titania (NP-TiO<SUB>2</SUB>) network structure by using a polystylene-<I>block</I>-poly(4-vinylpyridine) (PS-<I>b</I>-P4VP) diblock copolymer template and modifying the surface of NP-TiO<SUB>2</SUB> with ionic liquids (ILs), bmim-BF<SUB>4</SUB> and benmim-Cl. The effect of the molecular weight of PS-<I>b</I>-P4VP on the morphology of the NP-TiO<SUB>2</SUB> and IL-modified NP-TiO<SUB>2</SUB> are characterized by scanning electron microscopy and contact angle measurements. Subsequently, hybrid solar cells are fabricated using MEH-PPV and NP-TiO<SUB>2</SUB>, and the effect of IL layers and IL concentrations on device performances are evaluated under AM 1.5 G illumination. The devices containing bmim-BF<SUB>4</SUB> and benmim-Cl show drastically enhanced open circuit voltages (<I>V</I><SUB>oc</SUB>) of 1.05 V and 0.91 V, respectively, while the reference device without an IL layer exhibits a <I>V</I><SUB>oc</SUB> of 0.60 V. Significantly improved <I>V</I><SUB>oc</SUB> can be attributed to the change in interfacial energy levels by formation of ionic double layers at the TiO<SUB>2</SUB>/IL and at the IL/MEH-PPV interfaces. We also observed the trend that short circuit current decreased and <I>V</I><SUB>oc</SUB> increased with increasing IL concentration, which is ascribed to interruption of charge transfer from MEH-PPV to TiO<SUB>2</SUB> and the change in interfacial energy level by shifting the vacuum level, respectively.</P> <P>Graphic Abstract</P><P>The interfacial energy level of ionic double layers at the TiO<SUB>2</SUB>/MEH-PPV interface can change, resulting in remarkably improved open circuit voltages. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cp01754j'> </P>