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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.
Pharmacognostic Evaluation of the Flower of Alcea rosea L.
Shanta Mehrotra,A. K. S. Rawat,Usha Shome 한국생약학회 1999 Natural Product Sciences Vol.5 No.1
The flowers of Alcea roses L., Malvaceae, sold in the Indian market under the trade name `Gulkhairo`, are well known for their expectorant, cooling and diuretic properties and used in many indigenous cough mixtures in India. The present paper deals with the detailed pharmacognosy of the floral parts including morphological, anatomical, phytochemical and fluorescence characters. Some of the diagnostic features of the drug are : pedicel characterized by multicellular appendages, stellate hairs, rosette crystals of Ca-oxalate. starch sheath and large sized mucilage canals; sepals having distinctive multicellular appendages arranged in a semilunar fashion present adaxialty at their base; monadelphous stamens, pollen grains pentaporate provided with dimorphic spines; placentation axile, ovules campylotropous; dark green fluorescence of the powder with nitrocellulose in amyl acetate and yellow fluorescence of trichomes under Fluorescence microscope.
Standardization and Quality Evaluation of Banafsha
Shanta Mehrotra,A. K. S. Rawat,Usha Shome 한국생약학회 1998 Natural Product Sciences Vol.4 No.1
`Banafsha` is an important herbal drug of indigenous systems of medicine. Flowers of Viola odorata L. (Violaceae) are considered to constitute the genuine drug `Banafsha`. However, due to limited distribution of this plant, another species of Viola, i.e. V. pilosa having almost similar medicinal properties, is mostly used under this vernacular instead. Ethnobotanically also different species of Viola i.e. V. odorata, V. pilosa and V. betonicifolia are used for various ailments at different places in our country. In the present study two species of Viola, namely V. pilosa and V. betonicifolia along with the commercial samples of `Banafsha` were studied and authenticated. It was observed that the market samples procured from Dehradun, Mumbai, Lucknow, Palampur, Ramnagar and Ranikhet showed close resemblance with Viola pilosa in having similar morphological characters like uniseriate hairs on the ovary, geniculate and clavate style, truncate stigma and almost similar TLC profiles. On the other hand the Almora sample was identified as Viola betonicifolia by the presence of large purple flowers, clavate style and convex stigma forming hump like structure. However, the market sample procured from Pathankot was found to be a mixture of two species of Viola namely, V. pilosa and V. odorata having dominance of the former species.
Robust Path Tracking Control of Nonholonomic Wheeled Mobile Robot: Experimental Validation
Spandan Roy,Sambhunath Nandy,Ranjit Ray,Sankar Nath Shome 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.4
The article addresses a robust control strategy for efficient path tracking of nonholonomic wheeled mobile robot (WMR) based on time delay approach. Depending on the application requirements, nonholonomic WMR system might be subjected to various payloads, which affects the overall system mass, inertia, position of center of mass and other hardware parameters statically or dynamically. Under such circumstances, accurate modeling of nonholonomic robots is difficult and challenging. The proposed controller negotiates uncertainties caused due to payload variations as well as associated disturbances and reduces modeling effort through approximation of the overall uncertainties with a composite function. It has been shown that the controller does not require any bounds on the uncertainties, thus providing unconstrained working paradigm. The controller is proposed for a nonholonomic WMR and its effectiveness is verified through simulation and experimentally while WMR is commanded to track various paths. The superior performance is also noted against adaptive sliding mode control law.