http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hong Diem Chau,Meenal Kataria,권나연,박수홍,김영서,강훈구,Amit Kumar Harit,우한영,윤효재,박성남,조민주,최동훈 한국고분자학회 2022 Macromolecular Research Vol.30 No.8
Recently, all-polymer solar cells (all-PSCs) have realized significantly improved power conversion efficiencies (PCEs) through the development of various high-performance polymer donors and polymer acceptors. In addition, their device efficiency has been maximized using numerous strategies, such as thermal annealing and adding additives. In this study, we synthesized a new low-bandgap polymer acceptor (PTPB-TT) for application in all-PSCs. PTPB-TT exhibited adequate energy levels as a polymer acceptor and efficient complementary absorption behavior in the blend film. Moreover, we introduced a ternary system with [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) as the third-component acceptor to improve the light-harvesting properties and morphology of the binary blend film. PC61BM realizes the cascade energy levels in the ternary system, enabling more efficient charge transfer between the donor and the acceptor polymers than in the binary system. Therefore, the corresponding ternary devices displayed a relatively high PCE of 8.03% compared to the binary all-PSCs.
Hong Diem Chau,권나연,박수홍,황진효,조승욱,이동원,조민주,최동훈 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
In this report, two isomeric BDT-based copolymers, TTE25 and TTE36, were designed and synthesized. The difference in the linking positions of carboxylates in the thienothiophene unit of TTE25 and TTE36 leads to significant different properties between these two copolymers, including the HOMO level, absorption region and crystallinity. Owing to the good miscibility, and especially, of the broad complementary absorption of the TTE25 and TTE36 blend, mixtures of these two polymers at different composition were applied as the donor for the active layer in PC61BM-based organic indoor photovoltaics (IPVs). Under 1000 lux white LED illumination, the optimized TTE36:TTE25:PC61BM (0.8:0.2:1.0 wt. ratio)-ternary-blend-based IPVs achieved a significant increase of PCE to 11.14% compared to the moderate PCE of 6.72% for those without TTE25. This study demonstrated that blending two isomeric polymers is a promising strategy for realizing high-efficiency IPV devices under indoor light conditions.
박수홍,권나연,Hong Diem Chau,조승욱,최동훈 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
New wide-bandgap donor-acceptor-π type conjugated polymers, PBTTT and PBTDTT, containing different π-extended conjugated bridges between BDT as a donating unit and 3-carboxylthiophene (3CT) as a weak electron-withdrawing group, were successfully synthesized. Thienothiophene (TT) and dithienothiophene (DTT) were selected as fused thiophene bridges for inclusion in the polymer backbone. As the conjugation length of the π-extended bridge (i.e., from thiophene to DTT) increased, the bandgap of the polymer slightly decreased, and the highest occupied molecular orbital level shifted to a higher-lying level. Among the three copolymers, PBTTT-based non-fullerene polymer solar cells (NF-PSCs) with ITIC-Me showed a high power conversion efficiency of 7.30% with a high short circuit current density of 14.05 mA/cm2. The superior performance of the NF-PSCs based on PBTTT may be attributed to their predominant face-on orientation of polymer chains and relatively more favorable surface morphology.
박수홍,권나연,Hong Diem Chau,이동원,강훈구,윤효재,조민주,최동훈 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
The conjugated random terpolymers, PJ-25, PJ-50, and PJ-75 were successfully synthesized from three different monomers. Fluorine-substituted benzotriazole (2F-BTA) was incorporated into BDT-T-Cl and BDD based alternating copolymer PM7 as a third monomeric unit. Outdoor photovoltaic (PV) cells (AM 1.5 G) based on the PJ-50:IT-4F blend showed high power conversion efficiency (PCE) of 11.34%. In addition, the selected polymer donor of PJ-50 was also employed for indoor PV (IPV) cells and was blended with non-fullerene acceptors, which have different absorption range. Among them, the PJ-50:IT-4F-based IPV device had the highest PCE of 17.41% with a J<sub>sc</sub> of 54.75 μA cm<sup>-2</sup> and an FF of 0.77 under a 160 μW cm<sup>-2</sup> LED light. The terpolymer introduced in this study can be regarded as a promising material for the fabrication of outdoor PV and IPV cells with excellent performance involving the use of an eco-friendly solvent.
김영언,박수홍,권나연,Hong Diem Chau,조승욱,조민주,최동훈 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
To implement a highly flexible polymer solar cell (PSC), the mechanical properties of the material constituting the active layer are considered crucial, having a significant influence on the stability of the device. In this study, the mechanical properties of a main-chain conjugated copolymer (PBDT2T-b-PNDI2T) containing donor- and acceptor-based macromolecular species in the polymer backbone was measured and compared with that of donor and acceptor polymer blend film (P(BDT2T):P(NDI2T)). It was observed that the PBDT2T-b-PNDI2T active layer exhibited a higher crack-onset-strain and toughness compared to P(BDT2T):P(NDI2T) active layer. Correspondingly, the YTRON/polyethylene naphthalate (PEN) based flexible PSC with a PBDT2T-b-PNDI2T active layer was used, which exhibited superior mechanical stability under multiple bending conditions.