Boron doped ZnO particles were prepared by using zinc chloride precursors in an autoclave at 200 degrees C via a simple hydrothermal technique and the particles were annealed at 600 degrees C in air. Thermo-gravimetric and differential thermal analysis showed that endothermic peaks were observed between 100 degrees C and 200 degrees C accompanying with the water loss on the samples. X-ray diffraction measurements showed that boron doped ZnO particles have hexagonal wurtzite structure and boron atoms incorporate interstice in the ZnO lattice. Morphological characterization of the films were done by a scanning electron microscope and the results showed that by adding boron the morphology changes from hexagonal rodlike to particle-like structure. Optical measurements revealed that absorbance peak of boron doped ZnO particles were blue shifted.