he effect of laser fluence on structural, morphological, optical, and electrical properties of CdSe
nanoparticles NPs prepared by irradiating a CdSe target, immersed in methanol, with Nd:YAG laser pulses
at laser fluences in the range of (1.32–2.92) J/cm 2 has been studied. Xray diffraction XRD measurements
disclosed that the CdSe NPs were of wurtzite hexagonal crystal structure. Transmission electron microscopy
investigation revealed that the synthesized CdSe particles are spherical and have an average particle size in the
range of (37–94 nm). Scanning electron microscope SEM and transmission electron microscope TEM
investigations showed that the shape and size of the synthesized CdSe NPs depend on laser fluence. The
nanoparticles distribution was correlated with laser fluence. Atomic force Microscopic AFM investigations
showed highly dispersed ballshape CdSe particles. The optical energy gap of CdSe nanoparticles prepared
has been determined from optical properties and found to be in the range of (1.7–2.05 eV). Optical constants
of CdSe NPs were determined from transmittance and reflectance spectra. Hall measurement showed that
the CdSe nanoparticles were ntype and their carrier concentration and mobility was investigated
الاستاذ الدكتور نادر فاضل حبوبي | Prof. Dr.Nadir Fadhil Habubi | 8022