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Sanchari Shome,Li Yifan,신희정,Shuao Chen,임대희,권순기,고서진,Metin Akbulut,강동원,이보람,김윤희,최효성 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.3
A straightforward competent strategy to attune the solid-state morphology, opto-electronic and photovoltaic properties of conjugated co-polymers has been studied by inserting different percentages of N,N-dimethylthiophene-3-carboxamide (TDM) monomeric units. The TDM percentage was varied from 20 to 100%, resulting in widening of the energy band gap. Fabrication of solar cells was performed with ITIC-4F as an electron acceptor to accomplish power conversion efficiencies (PCEs) of 7.8% for P4 (minimum TDM) and 0.85% for P1 (maximum TDM) under a thermal tempering process. A drastic drop in the PCE was noted with increasing percentage of TDM which agrees well with the optical, electronic, and morphological studies. Morphological analysis revealed high crystallinity for P4:ITIC-4F blend having minimum percentage of TDM units compared to its counterparts of higher TDM percentages. A sharp increase in π-π stacking is seen with reduced percentage of TDM units, leading to d spacing of 3.6 A. Detailed investigations regarding the charge carrier transport in relation to the π-π stacking of the polymeric fi lm are well implemented in this work.
Impact of Chalcogenophenes on Donor-Acceptor Copolymers for Bulk Heterojunction Solar Cells
조남기,Sanchari Shome,유은상,신희정,이보람,김인태,최효성 한국고분자학회 2020 Macromolecular Research Vol.28 No.12
Three new selenophene-based conjugated copolymers having different ratios of the monomeric units were designed, synthesized and thoroughly characterized. The introduction of an electron-poor and surfaced building moiety like selenathiazole was highly efficient in tuning the bandgap and polymer properties. The chalcogenophene-based medium-bandgap polymers demonstrated low-lying HOMO energy levels (~5.87eV), which is benign for use in multi-junction polymer solar cell applications. The representative polymers with heavy atoms revealed the change in electronegativity and atomic size that highly affected the molecular property, its topological features, and photovoltaic properties in polymer solar cells. The selenium-substituted (0.5:0.5) polymer donors showed power conversion efficiencies above 3% when combined with [6,6]-phenyl- C71-butyric acid methyl ester (PC70BM) acceptors in a quintessential bulkheterojunction solar cell.
이경석,신희정,Sanchari Shome,박지현,고서진,최효성,김윤희 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Organic solar cells (OSCs) have received powerful attention because of their light, low cost, flexible photovoltaics properties. In this report, the new 3,8-difluoro-indolo[3,2-b]indole (IDID) donor unit was developed for organic electronic applications. Novel donor-accept copolymers based on PFDHI-THT, PFDHI-TFT, PFDHI-T2FT were prepared using notorious benzothiadiazole derivatives including fluorine atoms as the acceptors. The optical, electrochemical, thermal properties of these all new synthesized copolymers were characterized. The solar cell using PFDHI-TFT as donor showed PCE of 5.98% with VOC of 0.80 V, JSC of 10.56 mA cm<sup>–2</sup> and FF of 0.71, respectively, under AM 1.5 G illumination (100 mW/cm<sup>2</sup>) in the absence of annealing.