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Prakash Barman M. Shubhakanta Singh Jameson Maibam R. K. Brojen B. Indrajit Sharma 《Indian Journal of Physics》2010,84(6):711-716
A computer program has been developed using Rutherford’s Screened Scattering Model and Energy loss model due to Bethe and
applied to simulate the electron interaction pattern in the sample of NbC and NbN with a resist layer of PMMA (Polymethyl
Methylacrylate). Using the program we have studied the extent of penetration, lateral spread for different electron energies
and the degree of electron back scattering. It has been found that backscattering and lateral spread is more in case of NbC
than in NbN signifying hard, refractory and ceramic properties of NbC. 相似文献
2.
B. Indrajit Sharma Jameson Maibam R. S. Paul R. K. Thapa R. K. Brojen Singh 《Indian Journal of Physics》2010,84(6):671-674
Energy band structure of NbC and NbN are calculated using generalized gradient approximation (GGA) within density functional
theory (DFT) including five high symmetry points W, L, Γ, X and K. The lowest band corresponds to 2s band of non metal (C and N) atoms and the next lowest band is formed by 2p nonmetal. The decomposing points of t
2g
states (Γ
25), e
g
states (Γ
12) and C or N 2p states (Γ
15) show interesting behavior different from earlier reports. 相似文献
3.
Avinash P. Jadhav Ambarish Kumar Singh Ashakiran Maibam Sailaja Krishnamurty Kothandam Krishnamoorthy Jayaraj Nithyanandhan 《Photochemistry and photobiology》2023,99(2):529-537
In dye-sensitized solar cell, modulating the electronic properties of the sensitizer by varying the donor, π-spacer, acceptor and anchoring groups help optimizing the structure of the dye for better device performance. Here, a donor–acceptor–donor-based unsymmetrical thiosquaraine sensitizer ( SQ5S ) has been designed and synthesized. Photophysical, electrochemical, theoretical and photovoltaic characterizations of SQ5S dye have been compared with its oxygen analog, SQ5 . The incorporation of the sulfur atom in the acceptor unit of SQ5S dye showed an intense peak at 688 nm, which was 38 nm of red-shifted and showed the panchromatic light harvesting response with the onset of 850 nm compared with SQ5 dye. The LUMO and HOMO energy levels are well aligned with the conduction band of TiO2 and the redox potential of electrolyte for the charge injection and the dye-regeneration processes, respectively. Photovoltaic efficiency of 1.51% (VOC 610 mV, JSC 3.07 mA cm−2, ff 81%) has been achieved for SQ5S dye, whereas SQ5 showed the device performance of 5.43% (VOC 723 mV, JSC 9.3 mA cm−2, ff 80%). The decreased device performance for the dye SQ5S has been attributed to the favorable intersystem crossing process associated with the photoexcited SQ5S that reduces the driving force for the charge injection process. 相似文献
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