Carrier multiplication detected through transient photocurrent in device-grade films of lead selenide quantum dots.

ABSTRACT: In carrier multiplication, the absorption of a single photon results in two or more electron-hole pairs. Quantum dots are promising materials for implementing carrier multiplication principles in real-life technologies. So far, however, most of research in this area has focused on optical studies of solution samples with yet to be proven relevance to practical devices. Here we report ultrafast electro-optical studies of device-grade films of electronically coupled quantum dots that allow us to observe multiplication directly in the photocurrent. Our studies help rationalize previous results from both optical spectroscopy and steady-state photocurrent measurements and also provide new insights into effects of electric field and ligand treatments on multiexciton yields. Importantly, we demon

SUBMITTER: Gao J 

PROVIDER: S-EPMC4569798 | biostudies-literature | 2015 Sep

REPOSITORIES: biostudies-literature