RT journal article
T1 Reversible formation of gold halides in single-crystal hybrid-perovskite/Au interface upon biasing and effect on electronic carrier injection
A1 Pospisil, Jan
A1 Guerrero, Antonio
A1 Zmeskal, Oldrich
A1 Weiter, Martin
A1 Gallardo Bernal, Juan Jesús
A1 Navas Pineda, Francisco Javier
A1 Garcia-Belmonte, Germá
A2 Química Física
AB Solar cells, light emitting diodes, and X-ray detectors based on perovskite materials often incorporate gold electrodes, either in direct or indirectcontact with the perovskite compound. Chemical interactions between active layers and contacts deteriorate the operation and induce degradation, being the identification of the chemical nature of such interfacial structures an open question. Chemical reactivity of gold in contact with the perovskite semiconductor leads to reversible formation of oxidized gold halide species and explains the generation of halide vacancies in the vicinity of the interface. Electrical biasing induces contact reaction and produces modifications ofthe current level by favoring the ability of perovskite/Au interfaces to inject electronic carriers. The current injection increment does not depend onthe halogen source used, either extrinsically by iodine vapor sublimation of Au electrodes, or intrinsically by bias-driven migration of bromide ions. In addition, the formation of a dipole-like structure at the reacted electrode that lowers the potential barrier for electronic carriers is confirmed. These findings highlight adequate selection of the external contacts and suggest the needfor a deeper understanding of contact reactivity as it dominates the operation characteristics, rather than being governed by the bulk transport properties of the charge carriers, either electronic or ionic.
PB WILEY
SN 1616-3028
YR 2019
FD 2019
LK http://hdl.handle.net/10498/30434
UL http://hdl.handle.net/10498/30434
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026