Relaxation dynamics of photogenerated electrons and holes in quantum dots and applications to photon conversion in quantum dot solar cells

摘要

Femtosecond transient absorption (TA) spectroscopy has been used to characterize charge carrier relaxation from the second excited state (1P) to the first excited state (1S) in colloidal indium phosphide (InP) quantum dots (QDs).A three-pulse experiment consisting of a visible pump,infrared pump,and white light probe,was used to characterize the relaxation of photo-generated excitons,and the roles of surface chemistry and size were investigated.