Reducing the drift of colloidal quantum dots photodetectors

Colloidal quantum dots represent a breakthrough technology for the development of optical devices, in particular photodetectors. However, the performance of CQDs photodetectors show strong aging phenomena. To solve this problem, we investigate the degradation of NIR photodetectors based on lead sulphide CQDs as a function of time and propose a viable solution to improve their time drift. The approach is based on a polymer or resin deposition for the device passivation. The devices were measured over a long time span and passivated detectors were compared to as grown ones. The results show a reduced drift of the passivated devices.