http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Synthesis and Characterization of Organic Solvent-Soluble Self-Doped Conducting Polymer
양남규,고의진,문두경 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) has widely been used as a representative conducting polymer for its high conductivity and water dispersibility. However, problems due to its acidity, hygroscopic nature and low solubility are still big issues to be solved. In this study, new self-doped PEDOT derivativative P1 was designed and synthesized. Since P1 is a homo-polymer, the degree of polymerization can be controlled, and thus, electrical properties of P1 can also be adjusted readily. Sheet resistance and electrical conductivity were measured and the results were comparable to those of commercial PEDOT:PSS. Due to its tunable electrical properties and solubility in various organic solvents, P1 can be a novel candidate for various applications such as electrode, hole-transport-layer (HTL) and antistatic-coating.
Interchain hydrogen-bonded conjugated polymer for enhancing the stability of organic solar cells
양남규,Sung Jae Jeon,Young Hoon Kim,Hyoung Seok Lee,Dong Hyun Hong,문두경 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-
Operational stability of organic solar cells (OSCs) is a key issue for the commercialization. In order toenhance the stability of OSCs, various strategies are being used. In this study, pyrroles and isoindigomonomers with tert-butoxycarbonyl side chains were synthesized and used to prepare a D–A-type polymer,P(TBPyTBIID), via Stille coupling. The obtained polymer dissolved readily in organic solvents, such aschloroform. However, the formation of interchain hydrogen bonds after side-chain cleavage via thermaltreatment rendered the resulting polymer insoluble in organic solvents. In addition, strong p p stackingdue to face-on orientation enabled dense packing of the structure, which led to an increase in resistancesto organic solvents, acid, and ultraviolet (UV) light. P(TBPyTBIID) was introduced as a UV and externalprotective layer, along with silver nanoparticles, at the back surface of the glass substrate. The lightsoakingstability was enhanced without significantly reducing the efficiencies of the organic solar cells. This work indicates that introducing an UV blocking layer can be an effective strategy to increase the stabilityof organic solar cells.
양남규,김강욱,장은미,문두경 한국공업화학회 2023 한국공업화학회 연구논문 초록집 Vol.2023 No.0
Pyrazine is a heterocyclic ring-based material and has been spotlighted as an emerging building block for polymeric donor in organic solar cells. Pyridazine and pyrimidine are structural isomers of pyrazine which contain two nitrogen atoms in their structure, in different position. Due to their structural differences, they each show different optical, electrochemical properties. In this study, we designed and synthesized three monomers, based on pyrazine, pyridazine and pyrimidine, and three polymer donors containing each. Computational calculation showed that the conformation of two thiophene spacers adjacent to the pyrazine, pyridazine and pyrimidine core can be locked (or stabilized) due to the interaction between sulfur and nitrogen atoms. Optical, electrochemical, thermal, and photovoltaic properties of the polymers are measured and analyzed closely to confirm that the polymers are suitable candidates as active materials in high performance organic solar cells.
양남규,문두경,전성재,박희선 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Organic solar cells (OSCs) have been spotlighted as an excellent renewable energy source due to its light-weight, flexibility, low-cost and solution-processability. Research worldwide about donor and acceptor materials for active layer have led to OSCs’ high power conversion efficiencies (PCEs) up to 15.6%, and even 17.3% for a tandem structure in laboratory-scale (for a single cell). However, the PCEs falls down drastically as going through module manufacturing process, and this can be a big obstacle for commercialization. To solve this problem, several issues such as solubility, film uniformity, energy-level alignment should be considered and continuous effort is needed. In this study, new polythiophene derivative based polymer was synthesized and introduced as a Hole transport layer (HTL) in inverted OSCs. Its alcohol solubility, thickness independence and amphiphilic nature can successfully minimize the energy loss in a large-area fabrication.
Inter-chain hydrogen bondable Conjugated Polymer for Interlayer in Organic Solar Cells
양남규,전성재,문두경 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Conjugated polymers have widely been used in organic optoelectronic devices for their light weight, low cost, flexibility and solution processability. In the field of organic solar cells (OSCs), conjugated polymers can be used in almost all layers including electrodes. However, for interlayers like hole transporting layers (HTLs) the choice range of materials is quite narrow for some issues. If adjacent two layers are soluble in the same solvent, there may be an intermixing between two layers, causing an extra energy loss. In this study, we designed and synthesized new conjugated polymer P1 for HTLs in OSCs. Once coated on the substrate, side chains were detached by thermal treatment, lowering P1’s solubility. In consequence, P1 stayed intact after another drop of solvent was applied. With this immobilization strategy and all other measured properties considered, new conjugated polymer P1 can be an attractive candidate for HTLs in OSCs.