Performance Parameters of Graphite and Platinum Counterelectrode Based Dye Sensitized Solar Cells

In the present course of work, we have successfully prepared a dye sensitized solar cell  (DSSC) based on TiO2 film coated ITO (indium doped tin oxide) glass photo anode, N719 dye as sensitizer, iodine as redox couple electrolytes and a counter electrode with graphite film coated ITO glass. Powder of TiO2 was synthesized by sol gel route technique. The XRD pattern confirms the anatase and rutile phase of TiO2. Crystallite size of TiO2 powder is 75.5nm. The TiO2 paste was coated on ITO by doctor blade technique. The FTIR spectrum shows a main peak corresponding to 495cm-1. However, UV-Visible absorbance of graphite/ITO glass and platinum/ITO glass were obtained as 20-25% and 7-17% respectively in the wavelength range of 300-800nm. The open circuit voltage of DSSC has been observed to be maximum 690.1mV and 619.5mV for platinum and graphite counter electrode respectively. The OCV decay shows the non linear nature. The fill factor values were obtained as 0.60 and 0.50 for platinum and graphite based electrode of DSSCs respectively. The efficiencies of DSSC with platinum/ITO and graphite/ITO electrodes were found to be 1.63% and 0.89% respectively.

Search for CPCP violation in ttH and tH production in multilepton channels in proton-proton collisions at s\sqrt{s} = 13 TeV

International audienceThe charge-parity (CP) structure of the Yukawa interaction between the Higgs (H) boson and the top quark is measured in a data sample enriched in the t$\overline{\textrm{t}}$H and tH associated production, using 138 fb$^{−1}$ of data collected in proton-proton collisions at $\sqrt{s}$ = 13 TeV by the CMS experiment at the CERN LHC. The study targets events where the H boson decays via H → WW or H → ττ and the top quarks decay via t → Wb: the W bosons decay either leptonically or hadronically, and final states characterized by the presence of at least two leptons are studied. Machine learning techniques are applied to these final states to enhance the separation of CP -even from CP -odd scenarios. Two-dimensional confidence regions are set on κ$_{t}$ and $\overset{\sim }{\kappa } _{t}$, which are respectively defined as the CP -even and CP -odd top-Higgs Yukawa coupling modifiers. No significant fractional CP -odd contributions, parameterized by the quantity |${f}_{CP}^{\textrm{Htt}}$| are observed; the parameter is determined to be |${f}_{CP}^{\textrm{Htt}}$| = 0.59 with an interval of (0.24, 0.81) at 68% confidence level. The results are combined with previous results covering the H → ZZ and H → γγ decay modes, yielding two- and one-dimensional confidence regions on κ$_{t}$ and $\overset{\sim }{\kappa } _{t}$, while |${f}_{CP}^{\textrm{Htt}}$| is determined to be |${f}_{CP}^{\textrm{Htt}}$| = 0.28 with an interval of |${f}_{CP}^{\textrm{Htt}}$| < 0.55 at 68% confidence level, in agreement with the standard model CP -even prediction of |${f}_{CP}^{\textrm{Htt}}$| = 0.[graphic not available: see fulltext

Search for a charged Higgs boson decaying into a heavy neutral Higgs boson and a W boson in proton-proton collisions at s=\sqrt{s} = 13 TeV

A search for a charged Higgs boson ${\mathrm{\tilde{H}^{\pm}}}$ decaying into a heavy neutral Higgs boson H and a W boson is presented. The analysis targets the H decay into a pair of tau leptons with at least one of them decaying hadronically and with an additional electron or muon present in the event. The search is based on proton-proton collision data recorded by the CMS experiment during 2016-2018 at $\sqrt{s} =$ 13 TeV, corresponding to an integrated luminosity of 138 fb$^{-1}$. The data are consistent with standard model background expectations. Upper limits at 95% confidence level are set on the product of the cross section and branching fraction for an ${\mathrm{\tilde{H}^{\pm}}}$ in the mass range of 300-700 GeV, assuming an H with a mass of 200 GeV. The observed limits range from 0.085 pb for an ${\mathrm{\tilde{H}^{\pm}}}$ mass of 300 GeV to 0.019 pb for a mass of 700 GeV. These are the first limits on ${\mathrm{\tilde{H}^{\pm}}}$ production in the ${\mathrm{\tilde{H}^{\pm}}} \to \mathrm{H} \mathrm{W^{\pm}}$ decay channel at the LHC.A search for a charged Higgs boson H$^{±}$ decaying into a heavy neutral Higgs boson H and a W boson is presented. The analysis targets the H decay into a pair of tau leptons with at least one of them decaying hadronically and with an additional electron or muon present in the event. The search is based on proton-proton collision data recorded by the CMS experiment during 2016–2018 at $\sqrt{s}$ = 13 TeV, corresponding to an integrated luminosity of 138 fb$^{−1}$. The data are consistent with standard model background expectations. Upper limits at 95% confidence level are set on the product of the cross section and branching fraction for an H$^{±}$ in the mass range of 300–700 GeV, assuming an H with a mass of 200 GeV. The observed limits range from 0.085 pb for an H$^{±}$ mass of 300 Ge V to 0.019 pb for a mass of 700 GeV. These are the first limits on H$^{±}$ production in the H$^{±}$→ HW$^{±}$ decay channel at the LHC.[graphic not available: see fulltext]A search for a charged Higgs boson H$^\pm$ decaying into a heavy neutral Higgs boson H and a W boson is presented. The analysis targets the H decay into a pair of tau leptons with at least one of them decaying hadronically and with an additional electron or muon present in the event. The search is based on proton-proton collision data recorded by the CMS experiment during 2016-2018 at $\sqrt{s}$ = 13 TeV, corresponding to an integrated luminosity of 138 fb$^{-1}$. The data are consistent with standard model background expectations. Upper limits at 95% confidence level are set on the product of the cross section and branching fraction for an H$^\pm$ in the mass range of 300-700 GeV, assuming an H with a mass of 200 GeV. The observed limits range from 0.085 pb for an H$^\pm$ mass of 300 GeV to 0.019 pb for a mass of 700 GeV. These are the first limits on H$^\pm$ production in the H$^\pm$ $\to$ HW$^\pm$ decay channel at the LHC