Transformation from crystalline precursor to perovskite in PbCl2-derived MAPbI3.

Abstract:

:Understanding the formation chemistry of metal halide perovskites is key to optimizing processing conditions and realizing enhanced optoelectronic properties. Here, we reveal the structure of the crystalline precursor in the formation of methylammonium lead iodide (MAPbI3) from the single-step deposition of lead chloride and three equivalents of methylammonium iodide (PbCl2 + 3MAI) (MA = CH3NH3). The as-spun film consists of crystalline MA2PbI3Cl, which is composed of one-dimensional chains of lead halide octahedra, coexisting with disordered MACl. We show that the transformation of precursor into perovskite is not favored in the presence of MACl, and thus the gradual evaporation of MACl acts as a self-regulating mechanism to slow the conversion. We propose the stable precursor phase enables dense film coverage and the slow transformation may lead to improved crystal quality. This enhanced chemical understanding is paramount for the rational control of film deposition and the fabrication of superior optoelectronic devices.

journal_name

Nat Commun

journal_title

Nature communications

authors

Stone KH,Gold-Parker A,Pool VL,Unger EL,Bowring AR,McGehee MD,Toney MF,Tassone CJ

doi

10.1038/s41467-018-05937-4

subject

Has Abstract

pub_date

2018-08-27 00:00:00

pages

3458

issue

1

issn

2041-1723

pii

10.1038/s41467-018-05937-4

journal_volume

9

pub_type

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