Mechanism and Timescales of Reversible p-Doping of Methylammonium Lead Triiodide by Oxygen.

ABSTRACT: Understanding and controlling the energy level alignment at interfaces with metal halide perovskites (MHPs) is essential for realizing the full potential of these materials for use in optoelectronic devices. To date, however, the basic electronic properties of MHPs are still under debate. Particularly, reported Fermi level positions in the energy gap vary from indicating strong n- to strong p-type character for nominally identical materials, raising serious questions about intrinsic and extrinsic defects as dopants. ​In this work, photoemission experiments demonstrate that thin films of the prototypical methylammonium lead triiodide (MAPbI₃ ) behave like an intrinsic semiconductor in the absence of oxygen. Oxygen is then shown to be able to reversibly diffuse into and out of the

SUBMITTER: Shin D 

PROVIDER: S-EPMC11468336 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature