Infrared-pump electronic-probe of methylammonium lead iodide reveals electronically decoupled organic and inorganic sublattices.

ABSTRACT: Organic-inorganic hybrid perovskites such as methylammonium lead iodide (CH₃NH₃PbI₃) are game-changing semiconductors for solar cells and light-emitting devices owing to their defect tolerance and exceptionally long carrier lifetimes and diffusion lengths. Determining whether the dynamically disordered organic cations with large dipole moment benefit the optoelectronic properties of CH₃NH₃PbI₃ has been an outstanding challenge. Herein, via transient absorption measurements employing an infrared pump pulse tuned to a methylammonium vibration, we observe slow, nanosecond-long thermal dissipation from the selectively excited organic mode to the inorganic sublattice. The resulting transient electronic signatures, during the peri

SUBMITTER: Guo P 

PROVIDER: S-EPMC6351559 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature