Fabrication of high performance PbS-colloidal quantum dot solar cell by two-step post annealing treatment

Abstract

We have suggested two types of annealing process for high performance of PbS colloidal quantum dot solar cell. We achieved 10.18 % power conversion efficiency (PCE) from 7.23 % by two types of annealing process. Also, we examined the mechanism of Voc, Jsc, FF enhancement briefly using x-ray photoelectron spectroscopy (XPS). The movement of hydrogen and oxygen contained inside of the film and outside in the air is an important issue of solid-state ligand exchange process, especially hydrogen is a key factor for the quantum dot surface passivation.