Colloidal Quantum Dot Photodiodes with Ligand-dependable and Photolithographic Patterning Technique

We patterned a quantum dot (QD) layer via photolithography and fabricated a QD photodiode using an inverted QD-light emitting diode (LED) structure.It shows behavior similar to normal photodiodes in terms of photoresponse.However, the dark current was reduced by 1/10 and the photocurrent increased 10 times in comparison with unpatterned QD photodiodes.This study is beneficial for creating multicolor QD sensors and simultaneously integrating LEDs and photosensors on the same structure.It means that the sensor works while blinking time of LED and it could be applied to advanced display technique.