Dr. Binay Kumar is the group leader of Crystal Lab in the Department of Physics & Astrophysics, University of Delhi, in which research work for the growth of single crystals of technologically important materials like high performance piezoelectric e.g. lead based PZN-PT, PMN-PT; lead free BNKT, NKLN; organic TGS; LiNbO3, etc., high Tc superconductors e.g. Bi-2212 system), ZnO & multiferroic BFO nano structure, MX2 compounds, Organic & Semiorganic NLO materials and their characterization are being undertaken. Enhancement of crystallographic and material properties by various pre- and post- growth treatments and doping to make these crystals more suitable for application is one of the targets of our research work. Single crystals are grown by flux, solution, vapor, Cz, traveling zone etc. techniques while the characterization include techniques like XRD, SEM, TEM, AFM, TGA, Dielectric conductivity, etc, Piezometry d33, Ferroelectric P-E loop, etc, UV-Vis, FTIR etc, etc. Since 2010, five major projects have been undertaken; ten students have completed Ph.D. while nearly 67 papers have been published in refereed International Journals.