Annealing effects on the photoresponse properties of CdSe nanocrystal thin films

► The as-prepared CdSe nanocrystal films were treated at 500 °C for 3 h under continuous N2. ► Annealing process removed the organic capping completely and eliminated oxide on the CdSe surface. ► Thermal annealing resulted the increase of the crystallite sizes and necking the NCs. ► The photoresponse speed of the CdSe nanocrystal films was improved.