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Badgujar, Sachin,Oh, Sora,Ahn, Taek,Lee, Sang Kyu American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.8
<P>Novel benzo[1,2-b: 4,5-b'] dithiophene-based polymer (P1) is designed and synthesized for panchromatic polymer solar cells. The synthesis, thermal stability, as well as the optical and photovoltaic properties of the polymer is systematically investigated. The polymer was thermally stable up to 310 degrees C, and readily soluble in common organic solvent. Conventional polymer solar cell with the configuration ITO/PEDOT: PSS/polymer: PC71BM/Ca/Al is fabricated. A polymer solar cell device prepared using P1 as the active layer exhibited a power conversion efficiency of 3.27% with an open circuit voltage of 0.76 V, a short-circuit current density of 9.03 mA/cm(2), and a fill factor of 0.47 under AM 1.5G (100 mW/cm(2)) conditions.</P>
Badgujar, S.,Song, C.,Oh, S.,Shin, W.,Moon, S. J.,Lee, J. C.,Jung, I.,Lee, S. Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.42
<P>We studied fullerene-free organic solar cells based on electron-donating (BDT3TR) and -accepting (O-IDTBR) small molecules. Bulk heterojunction devices comprising BDT3TR: O-IDTBR showed an excellent power conversion efficiency exceeding 7% and much better thermal stability than BDT3TR:PC70BM devices after ageing at 120 degrees C for 300 hours.</P>
Comparison of Different Techniques for Measurement of Cold Work in Mild Steel
Badgujar, B. P.,Jha, S. K.,Goswami, G. L. 한국비파괴검사학회 2003 한국비파괴검사학회지 Vol.23 No.6
There are various Non-Destructive Evaluation (NDE) techniques used for measurement of residual stresses in material, such as magnetic methods, X-ray diffraction, Ultrasonic velocity measurement etc. The capabilities, applications and limitations of these techniques for evaluation of cold work / plastic deformation were studied and compared. Mild steel plates were subjected to different degree of cold deformation and were analyzed by Magneto-mechanical Acoustic Emission (MAE), Barkhausen Noise (BN) and magnetic properties (hysteresis loop parameters analysis). Further, these specimens were analyzed by X-ray diffraction and ultrasonic velocity measurements. The microhardness measurement and microstructure studies of these cold worked plates were also carried out. The results of all these studies and comparison of different techniques are discussed in this paper.
Badgujar, Sachin,Bathula, Chinna,Moon, Sang-Jin,Lee, Soo-Hyung,Lee, Sang Kyu American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.8
<P>New dithieno[3,2-b: 2',3'-d] thiophene (DTT)-based copolymers were designed and synthesized for use as donor materials in polymer solar cells (PSCs). The optical, electrochemical, and photovoltaic properties of the copolymers were investigated. The results indicate that the acceptor units in the copolymers influenced the band gap, electronic energy levels, and photovoltaic properties of the copolymers significantly. The band gaps of the copolymers were in the range 1.85-2.02 eV. Under optimized conditions, the DTT-based polymers showed power conversion efficiencies (PCEs) for the PSCs in the range 0.97-1.19% under AM 1.5 illumination (100 mW/cm(2)). Among the copolymers, P2, which contained a pyrrolo[3,4-f] isoindole-tetraone acceptor unit, showed a power conversion efficiency of 1.19% with a short circuit current of 4.18 mA/cm(2), open circuit voltage of 0.77 V, and a fill factor of 0.37, under AM 1.5 illumination (100 mW/cm(2)).</P>
Sachin Badgujar,이상규,안택 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.6
Two thieno[3,4-c]pyrrole-4,6-dione (TPD)-based copolymers, poly[5,10-bis(2-ethylhexyloxy) naphtho[1,2-b:5,6-b’]dithiophene-2,7-diyl-alt-1,3-(5-heptadecan-9-yl)-4H-thieno[3,4-c]pyrrole-4,6- dione] (P1) and poly[4,9-bis(2-ethylhexyloxy)naphtho[1,2-b:5,6-b’]dithiophene-2,7-diyl-alt-1,3-(5- heptadecan-9-yl)-4H-thieno[3,4-c]pyrrole-4,6-dione] (P2), were synthesized and used as donor materials in polymer solar cells (PSCs). The optical, electrochemical, and photovoltaic properties of the copolymers were investigated. Under optimized conditions, the TPD-based polymers showed power conversion efficiencies (PCEs) for the PSCs in the range from 1.1 to 2.1% under AM 1.5 illumination (100 mW/cm2).
A thermally and mechanically stable solar cell made of a small-molecule donor and a polymer acceptor
Oh, Sora,Badgujar, Sachin,Kim, Da Hun,Lee, Wang-Eun,Khan, Nasir,Jahandar, Muhammad,Rasool, Shafket,Song, Chang Eun,Lee, Hang Ken,Shin, Won Suk,Lee, Jong-Cheol,Moon, Sang-Jin,Lee, Sang Kyu The Royal Society of Chemistry 2017 Journal of materials chemistry. A, Materials for e Vol.5 No.30
<▼1><P>Highly efficient and stable BDT2TR:PNDI-2T organic solar cells are investigated. Although this system shows a PCE of 4.43%, significant enhancements are observed in the thermal stability, high thickness tolerance, and flexibility as compared with the PC71BM-based organic solar cells.</P></▼1><▼2><P>We performed systematic experiments based on a small molecule donor and a polymer acceptor containing a naphthalene diimide (NDI)-based polymer as compared with fullerene-based acceptor (PC71BM) solar cells. Among polymer acceptors, the NDI-based polymer (PNDI-2T) shows good properties such as broad light absorbance with a strong absorption co-efficient and a well oriented crystalline structure leading to high electron mobility. We monitored the photovoltaic properties of both PNDI-2T and PC71BM acceptors with a BDT2TR donor. Although the BDT2TR:PC71BM device showed a higher PCE of 8.20%, the BDT2TR:PNDI-2T device also showed remarkable photovoltaic results with a PCE of 4.43%, <I>V</I>OC of 0.86 V, <I>J</I>SC of 7.26 mA cm<SUP>−2</SUP>, and FF of 71% indicating one of the highest efficiencies for small molecule donor and non-fullerene polymer acceptor systems. In particular, the PNDI-2T acceptor showed excellent thermal stability and intrinsic mechanical performance as compared with the PC71BM acceptor. To demonstrate the potential of the polymer acceptor for solar devices, we fabricated a device for testing thermal stability, high thickness tolerance, and the flexibility of the solar cell with bending stress. As a result, the PNDI-2T-based solar cell exhibited excellent thermal stability at 150 °C for 15 h and the PCE of the BDT2TR:PNDI-2T device with a thick active layer (around 610 nm) maintained 80% of its initial value. Moreover, the flexible device with the BDT2TR:PNDI-2T system retained its homogeneous morphology and showed maintained photovoltaic performance even after 100 bending cycles. Therefore, PNDI-2T based organic solar cells have good potential for application as flexible and portable real energy generators.</P></▼2>
Bathula, C.,Badgujar, S.,Belavagi, N. S.,Lee, S. K.,Kang, Y.,Khazi, I. A. Springer Science + Business Media 2016 Journal of fluorescence Vol.26 No.1
<P>This paper reports on the synthesis and characterization of novel donor-acceptor (D-A) conjugated polymers containing triisopropylsilylethyny(TIPS)benzo[1,2-b:4,5-b']dithiophene-diketopyrrolopyrrole (P1 and P2) through Stille co-polymerization method. Thermal stability, optical and electrochemical properties of these polymers were determined. Optical band gaps of the polymers as calculated from their film onset absorption edges were found to be 1.46 and 1.44 eV, respectively. Electrochemical studies revealed HOMO and LUMO energy levels to be -5.22, -5.60 eV, and -3.76, -4.16 eV, respectively. The polymers were thermally stable up to 400-440 A degrees C. Optoelectronic studies indicated that these materials to be promising candidates in solar cell applications.</P>