Sun-Ju Jung

Polymer solar cells are attracting attention as next-generation energy sources. Scalable deposition techniques of high-quality organic films should be guaranteed to realize highly efficient polymer solar cells in large areas for commercial viability. Herein, we introduce an ultrafast, scalable, and versatile process for forming high-quality organic films on an aqueous substrate by utilizing the spontaneous spreading phenomenon. This approach provides easy control over the thickness of the films

Here, we propose crystalline indium tin oxide/metal nanowire composite electrode (c-ITO/metal NW-GFRHybrimer) films as a robust platform for flexible optoelectronic devices. A very thin c-ITO overcoating layer was introduced to the surface-embedded metal nanowire (NW) network. The c-ITO/metal NW-GFRHybrimer films exhibited outstanding mechanical flexibility, excellent optoelectrical properties and thermal/chemical robustness. Highly flexible and efficient metal halide perovskite solar cells were

We report a novel flexible hybrid plastic film that can be used as a robust electrode platform for typical thin-film optoelectronic devices. Silver nanowires (AgNWs) were embedded on the surface of a glass-fabric reinforced transparent composite (GFRHybrimer) film to form a flexible transparent conducting substrate with excellent opto-electrical properties, superior thermal stability, and impressive mechanical flexibility. A highly efficient and flexible inverted organic solar cell with a power

Well established poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PC61BM) bulk-heterojunction organic photovoltaics (BHJ OPVs) were improved by incorporating a small portion of the discotic liquid crystal (DLC) additives with a strong self-assembling ability and high mobility. Under simulated solar illumination of AM 1.5 (100 mW/cm2), the devices fabricated using P3HT:PC61BM (1:1.2 w:w) layer blended with 3 wt % of 2,3,6,7,10,11-hexaacetoxytriphenylene (DLC 2) achieved an

We have investigated the effects of a directly nanopatterned active layer on the electrical and optical properties of inverted polymer solar cells (i-PSCs). The capillary force in confined molds plays a critical role in polymer crystallization and phase separation of the film. The nanoimprinting process induced improved crystallization and multidimensional chain alignment of polymers for more effective charge transfer and a fine phase-separation between polymers and [6,6]-phenyl-C71-butyric acid

Abstract Nematic liquid crystals (NLCs), 4‐cyano‐4′‐pentylbiphenyl and 4‐cyano‐4′‐octylbiphenyl, were applied as additives to polymer solar cells with P3HT:PC 61 BM blend films. The incorporation of NLC additives led to a higher absorbance of the blend film, a higher crystallinity of P3HT, closer P3HT chains, larger PC 61 BM domains and enhanced hole/electron mobilities even without post‐thermal annealing. The non‐annealed PSC with 4 wt.‐% 8CB additives showed an increase in all parameters, resu

Abstract Atmospheric and mechanical stability of perovskite solar cells (PSCs) must be guaranteed for successful commercialization. A fibrillar polymer, poly[ N ‐9′‐heptadecanyl‐2,7‐carbazole‐alt‐5,5‐(4′,7′‐di‐2‐thienyl‐2′,1′,3′‐benzothiadiazole)] (PCDTBT), is reported as an efficient hole transfer layer (HTL) which significantly improves air and mechanical stability of perovskite solar cells (PSCs). PCDTBT fibrils formed at the grain boundaries of perovskite layer induce the highest fracture en

Mono and dicarbazole-substituted pyrene derivatives, 9H-carbazol-9-ylpyrene (MCzP) and 1,6-di(9H-carbazol-9-yl)pyrene (DCzP), with dual-purpose function as a blue emitting and charge transporting layer in organic light emitting diodes, were synthesized and characterized. These series of molecules consisted of an electron donating (D) carbazole and an electron accepting (A) pyrene in D-A and D-A-D shapes. Non-doped blue electroluminescent devices with the configurations of ITO (150 nm)/alpha-NPD

-5,5'-(2,2'-bithiophene)] (P(NDI2OD-T2)) films formed on water for the application of nanotechnology-based organic electronic devices. First, the nanoscale molecule-substrate interaction between the polymer and water was modulated by controlling the alkyl side chain length in NDI-based copolymers. Increasing alkyl side chain lengths induced a nanomorphological transition from face-on to edge-on orientation, confirmed by molecular dynamics simulations revealing nanostructural behavior. Second, th

Effects of a newly synthesized additive, 2,2’5,5’-tetrathiophene-3,3’-hexyldithiophene (TTH), on the performance of polymer solar cells (PSCs) based on poly(3-hexylthiophene):[6 Wei, F., Yao, L., Lan, F., Li, G., & Liu, L. (2017). Beilstein J. Nanotechnol., 8, 123.[Crossref], [PubMed], [Web of Science ®] , [Google Scholar]]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) bulk-heterojuction were investigated. The PSC with a non-annealed P3HT:PCBM:TTH blend film showd an increase in the short-cir