Electroabsorption Spectroscopy Studies of (C₄H₉NH₃)₂PbI₄ Organic–Inorganic Hybrid Perovskite Multiple Quantum Wells

Abstract

Two-dimensional (2D) organic-inorganic hybrid perovskite multiple quantum wells that consist of multilayers of alternate organic and inorganic layers exhibit large exciton binding energies of order of 0.3 eV due to the dielectric confinement between the inorganic and organic layers. We have investigated the exciton characteristics of 2D butylammonium lead iodide, (CHNH)PbI using photoluminescence and UV-vis absorption in the temperature range of 10 K to 300 K, and electroabsorption spectroscopy. The evolution of an additional absorption/emission at low temperature indicates that this compound undergoes a phase transition at ≈250 K. We found that the electroabsorption spectrum of each structural phase contains contributions from both quantum confined exciton Stark effect and Franz-Keldysh oscillation of the continuum band, from which we could determine more accurately the 1s exciton, continuum band edge, and the exciton binding energy.

Acetone vapour-assisted growth of 2D single-crystalline organic lead halide perovskite microplates and their temperature-enhanced photoluminescence

“…Because no exciton binding energy for (PEA) 2 PbBr 4 has been reported so far to our knowledge, we compare this value with that of other reported similar 2D materials. [39][40][41] Our data have the same order of magnitude as the reported.…”

The Physics of Light Emission in Halide Perovskite Devices

“…In electroabsorption spectroscopy, the effect of an internal electric field on the transmittance is measured. According to one‐electron Franz–Keldysh–Aspnes (FKA) low‐field theory, the change in transmittance depends on the square of the applied electric field, and this has been found to be applicable to MAPbI 3 and other bulk semiconductors . Modulating the internal electric field with a DC bias allows the internal field to be measured; however, the impact of ionic screening must be carefully considered.…”

Quantum and Dielectric Confinement Effects in Lower-Dimensional Hybrid Perovskite Semiconductors

“…In the 3D compound obtained for monolayered compounds such as, the exciton fine structure, 49,333,334,308 multiexcitonic effects. 47,54,60,[335][336][337] Additional information may also come from various observations related to strong exciton-photon coupling in optical cavities, 74,75,338,339 the influence of chirality, 340 electrooptic effects, 333,341 or spin-selective optical Stark effects. 342 We will focus in this part on a brief overview of the experimental works dedicated to the exciton fine structure of monolayered perovskites.…”