Gyeong Eun Lim's research while affiliated with Pukyong National University and other places
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Publications (7)
A series of small-molecules (SMs) based on coplanar perylene unit coupled with diketopyrrolopyrrole chromophoric core exhibit broad absorption in the range of 500–800 nm and low bandgap energise of 1.6–1.7 eV. The power conversion efficiency approximately reach at 0.4% under 1.5 G illumination is achieved for organic solar cells based on a small-mo...
In order to increase the performance of organic solar cells (OSCs), an efficient electron donor must be designed which is capable of absorbing affluent amounts of solar irradiation and form nanoscale ordered domains in bulk hetero-junction (BHJ). Well conjugated coplanar structured dibenzosilole (DBSi) and diketopyrrolopyrrole (DPP) derivatives are...
A series of conjugated oligoelectrolytes consisting of fluorene and phenothiazine, 6,6',6″,6‴,6′′′′,6′′′′′-(9H,9′H,9′′H-[2,3′:6′,2′′-terfluorene]-9,9,9′,9′,9′′,9′′-hexayl)hexakis(N,N,N-trimethylhexan-1-aminium)bromide (FFiF),6,6′,6′′,6′′′-((10-(4-(trimethylammonio)butyl)-10H-phenothiazine-3,7-diyl)bis(9H-fluorene-9,9,2-triyl))tetrakis(N,N,N-trimeth...
A novel donor-π bridge - acceptor (A)-π bridge - donor type molecule (PCTDPP20) with planar core based on diketopyrrolopyrrole (DPP) and carbazole is synthesized by the Suzuki coupling reaction. We introduce phenyl rings to extend the π-conjugation length as a π-bridge. The HOMO and LUMO energy levels of PCTDPP20 are −5.13 and −3.57 eV, respectivel...
A non-conjugated polymer with a polar hydroxyl group as a side group, poly(vinyl alcohol) (PVA), is applied to polymer solar cells (PSCs) and polymer light-emitting diodes (PLEDs) as a buffer layer at the active layer/cathode interface. The best power conversion efficiency (PCE) of PSCs with the PVA film as a cathode buffer layer is 3.27%, which is...
A nonconjugated anionic polyelectrolyte, poly(sodium 4-styrenesulfonate) (PSS-Na), was applied to the optoelectronic devices as an interfacial layer (IFL) at the semiconducting layer/cathode interface. The ultraviolet photoelectron spectroscopy and the Kelvin probe microscopy studies support the formation of a favorable interface dipole at the orga...
A new low band gap polymer based on 9,10-dialkoxyphenanthrene and diketopyrrolopyrrole, poly[9,10-bis-(2-octyl-dodecyloxy)-phenanthrene-alt-2,5-dioctyl-3,6-di-thiophen-2-yl-2,5-dihydro-pyrrolo[3,4-c]pyrrole-1,4-dione] (PN40DPP) has been synthesized for photoactive polymer in polymer solar cells. The HOMO and LUMO energy level calculated from the on...
Citations
... Particularly, the improvement in J SC , V OC and FF values are mainly encouraged to the better PCEs. At the same time polymer without solvent additive produced less efficiency (~2%) because, it has poor aggregation may the rigidity of backbone structure, the large value of surface roughness and reduce the exciton formation [116]. ...
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... In the COE, molecules charge delocalization is performed through the π-conjugated backbone while the pendant groups improve its solubility [23]. As a class of synthetic molecules, COEs have been appreciated for their usefulness as EET components in various electrochemical systems [24][25][26][27][28]. This technology is based on the spontaneous binding of COE on lipid membrane, resulted in overcoming the electrical insulation [29,30]. ...
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... A higher surface potential further indicates a change in the work function upon catechin functionalization, which was probed by ultraviolet photoelectron spectroscopy (UPS), as shown in Fig. 5b. The work function (φ) of the TiO 2 nanosheet arrays before and after catechin modification was calculated from the Fermi level and secondary electron cut-off energy by employing the equation φ ¼ 21:22 À ðE Fermi À E CutÀ off Þ [45]. The calculated work functions for the TiO 2 nanosheet arrays and catechin-modified TiO 2 nanosheet arrays are 6.54 eV and 5.52 eV, respectively (Fig. 5c). ...
... To deal with this drawback, novel interfacial or buffer layer with adequate work function is needed to enhance collection of charges at electrodes and to minimize the rate of oxidation. To achieve good performance OSC devices, high electron transport materials like metal oxide, carbon based materials [7,8], metals of low work function [9], non-conjugated polymer [10], and other new emerging materials have been optimized as an intermediate layers. ...
