Efficient carrier multiplication in CsPbI₃ perovskite nanocrystals.

ABSTRACT: The all-inorganic perovskite nanocrystals are currently in the research spotlight owing to their physical stability and superior optical properties-these features make them interesting for optoelectronic and photovoltaic applications. Here, we report on the observation of highly efficient carrier multiplication in colloidal CsPbI₃ nanocrystals prepared by a hot-injection method. The carrier multiplication process counteracts thermalization of hot carriers and as such provides the potential to increase the conversion efficiency of solar cells. We demonstrate that carrier multiplication commences at the threshold excitation energy near the energy conservation limit of twice the band gap, and has step-like characteristics with an extremely high quantum yield of up to 98%. Using ult

SUBMITTER: de Weerd C 

PROVIDER: S-EPMC6180104 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature