Zinc　oxide　thin　films　in　the　form　of　flower　shaped　nanostructure　has　been　obtained　on　silicon　substrates　from　a　chemical　bath　consists　of　zinc　nitrate　and　ammonium　hydroxide　using　dimethylamine　as　a　complexing　agent.　The　influence　of　solution　pH　systematically　expose　the　growth　mechanism　of　prepared　thin　film　nanostructure.　Films　with　different　surface　morphology　has　been　obtained　in　terms　of　general　theory　of　nucleation　process.　Structural　investigation　showed　that　the　prepared　films　possess　nanocrystalline　nature　with　hexagonal　structure　with　most　prominent　reflection　along　(101)　plane.　Photoluminescence　and　Raman　spectroscopic　analyses　have　been　carried　out　to　determine　optical　properties　of　the　prepared　films.　Film　with　flower　like　nanostructure　level　the　progress　of　photocurrent　responsivity　of　the　prepared　films.