Abstract

The evolution from solvated precursors to hybrid halide perovskite films dictates most of the photophysicaland optoelectronic properties of the final polycrystalline material. Specifically, the complex equilibria andthe importantly different solubilities of lead iodide (PbI2) and methylammonium iodide (MAI) induceinhomogeneous crystal growth, often leading to a defect dense film showing non-optimaloptoelectronic properties and intrinsic instability. Here, we explore a supramolecular approach based onthe use of cyclodextrins (CDs) to modify the underlying solution chemistry. The peculiar phenomenondemonstrated is a tunable complexation between different CDs and MA+ cations concurrent to an out ofcage PbI2 intercalation. Notably, the first report of a connection between the solvation equilibria of thetwo perovskite precursors identified the optimal conditions in terms of CD cavity size and polarity andthose translate to a neat enhancement of PbI2 solubility in the reaction media, leading to an equilibration3 of the availability of the precursors in solution. The macroscopic result of this is an improved nucleationprocess, leading to a perovskite material with higher crystallinity, better optical properties and improvedmoisture resistance. Remarkably, the use of CDs presents a great potential for a wide range of devicerelatedapplications, as well as for the development of tailored composite materials.

Autore Pugliese

• Giannini Cinzia , Altamura Davide

Tutti gli autori

• Masi S.; Aiello F.; Listorti A.; Balzano F.; Altamura D.; Giannini C.; Caliandro R.; Uccello-Barretta G.; Rizzo A.; Colella S.

Titolo volume/Rivista

Chemical science

Anno di pubblicazione

2018

ISSN

2041-6520

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

Non Disponibile

Ultimo Aggiornamento Citazioni

Non Disponibile

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile