URSU Daniel Politehnica University of Timisoara/INCEMC Timisoara

Effect of the Mg Substitution on the Structural, Optical and Electrical Properties of CuCrO2 for Applications to p-Type Dye-Sensitized Solar Cells

Co-authors MICLAU Marinela, BANICA Radu, BUCUR Raul, VASZILCSIN Nicolae, CHIOSA Monica

The delafossite CuCrO2 is an important p-type dye solar cells (p-DSSCs) due to their potential role in the elaboration of future tandem dye solar cells with a photoanode and a photocathode built upon n-type and a p-type semiconductors, respectively. In the present study, we reported the main electrical and optical properties of Mg substitution CuCrO2, obtained by hydrothermal method using Cu2O, Cr(OH)3 and MgO as precursors. The crystal structure of CuCr1-xMgxO2, where (x=0 - 0,05), was investigated by X-ray diffraction, where can observe a shift of the diffraction peak belonging to the crystallographic plane (1 1 0), caused by the distortion of lattice determined by increasing of B ionic radius, in according with the difference between Mg2+ radii (r = 0.66 Å) and Cr3+ radii (r = 0.63 Å). From SEM images can be seen that the nanometric size of the particles is about 20-50 nm. EDX measurements confirm the purity of the material was present only peaks belonging to Cu, Cr and Mg. Optical characterization reveals that the band gap energy of the CuCr1-xMgxO2 with increasing Mg2+concentration from 2.86 eV (x= 0) to 2.91 eV (x= 0,05). Thus, Mg-doped CuCrO2 may have potential applications for p-Type Dye-Sensitized Solar Cells. Acknowledgements This paper is supported by the Sectoral Operational Programme Human Resources Development (SOP HRD), financed from the European Social Fund and by the Romanian Government under the project number POSDRU/159/1.5/S/134378