Evidence of tunable macroscopic polarization in perovskite films using photo-Kelvin Probe Force Microscopy

Title

Evidence of tunable macroscopic polarization in perovskite films using photo-Kelvin Probe Force Microscopy

Subject

SOLAR-CELLS; HIGHLY EFFICIENT; PHOTOVOLTAICS; EXTRACTION; ELECTRODES; DIFFUSION; TRANSPORT; LAYERS

Description

Using photo-Kelvin Probe Force Microscopy (photo-KPFM) we observed macroscopic, photo-induced polarization through 200 nm thick polycrystalline methylammonium lead triiodide (MAPbI(3)) perovskite films in MAPbI(3)/charge carrier transport material (CTM) bilayers. A polarization of up to similar to 600 mV was observed for some MAPbI(3)/CTM bilayers and the sign of polarization is dependent on the predominant charge carrier properties of the CTM used. We propose that through-film photo-KPFM polarization measurements can be useful in determining the efficacy of a CTM. Polarized perovskite films may also have applications as surfaces for performing electrochemical reactions.

Source

Mater. Lett. 2018217, 308-311. [Link]

Publisher

ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS

Date

2018

Contributor

Renna, L. A.; Liu, Y.; Russell, T. P.; Bag, M.; Venkataraman, D.

Type

Article

Collection