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Building Blocks of Hybrid Perovskites : A Photoluminescence Study of Lead-Iodide Solution Species

Shargaieva, Oleksandra ; Kuske, Lena ; Rappich, Jörg ; Unger, Eva LU and Nickel, Norbert H. (2020) In ChemPhysChem 21(20). p.2327-2333
Abstract

In this work, we present a detailed investigation of the optical properties of hybrid perovskite building blocks, [PbI2+n]n−, that form in solutions of CH3NH3PbI3 and PbI2. The absorbance, photoluminescence (PL) and photoluminescence excitation (PLE) spectra of CH3NH3PbI3 and PbI2 solutions were measured in various solvents and a broad concentration range. Both CH3NH3PbI3 and PbI2 solutions exhibit absorption features attributed to [PbI3]1− and [PbI4]2− complexes. Therefore, we propose a new mechanism for the formation of polymeric polyiodide... (More)

In this work, we present a detailed investigation of the optical properties of hybrid perovskite building blocks, [PbI2+n]n−, that form in solutions of CH3NH3PbI3 and PbI2. The absorbance, photoluminescence (PL) and photoluminescence excitation (PLE) spectra of CH3NH3PbI3 and PbI2 solutions were measured in various solvents and a broad concentration range. Both CH3NH3PbI3 and PbI2 solutions exhibit absorption features attributed to [PbI3]1− and [PbI4]2− complexes. Therefore, we propose a new mechanism for the formation of polymeric polyiodide plumbates in solutions of pristine PbI2. For the first time, we show that the [PbI2+n]n− species in both solutions of CH3NH3PbI3 and PbI2 exhibit a photoluminescence peak at about 760 nm. Our findings prove that the spectroscopic properties of both CH3NH3PbI3 and PbI2 solutions are dominated by coordination complexes between Pb2+ and I−. Finally, the impact of these complexes on the properties of solid-state perovskite semiconductors is discussed in terms of defect formation and defect tolerance.

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author
; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
keywords
coordination chemistry, hybrid perovskites, ligand-to-metal charge transfer, optical properties of solution species, polyiodide plumbates
in
ChemPhysChem
volume
21
issue
20
pages
7 pages
publisher
John Wiley & Sons Inc.
external identifiers
  • scopus:85091727509
  • pmid:32786129
ISSN
1439-4235
DOI
10.1002/cphc.202000479
language
English
LU publication?
no
id
d391c3f6-afe8-458f-b309-5a548974a6e2
date added to LUP
2021-01-22 16:34:18
date last changed
2024-06-14 08:47:43
@article{d391c3f6-afe8-458f-b309-5a548974a6e2,
  abstract     = {{<p>In this work, we present a detailed investigation of the optical properties of hybrid perovskite building blocks, [PbI<sub>2+n</sub>]<sup>n−</sup>, that form in solutions of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> and PbI<sub>2</sub>. The absorbance, photoluminescence (PL) and photoluminescence excitation (PLE) spectra of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> and PbI<sub>2</sub> solutions were measured in various solvents and a broad concentration range. Both CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> and PbI<sub>2</sub> solutions exhibit absorption features attributed to [PbI<sub>3</sub>]<sup>1−</sup> and [PbI<sub>4</sub>]<sup>2−</sup> complexes. Therefore, we propose a new mechanism for the formation of polymeric polyiodide plumbates in solutions of pristine PbI<sub>2</sub>. For the first time, we show that the [PbI<sub>2+n</sub>]<sup>n−</sup> species in both solutions of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> and PbI<sub>2</sub> exhibit a photoluminescence peak at about 760 nm. Our findings prove that the spectroscopic properties of both CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> and PbI<sub>2</sub> solutions are dominated by coordination complexes between Pb<sup>2+</sup> and I<sup>−</sup>. Finally, the impact of these complexes on the properties of solid-state perovskite semiconductors is discussed in terms of defect formation and defect tolerance.</p>}},
  author       = {{Shargaieva, Oleksandra and Kuske, Lena and Rappich, Jörg and Unger, Eva and Nickel, Norbert H.}},
  issn         = {{1439-4235}},
  keywords     = {{coordination chemistry; hybrid perovskites; ligand-to-metal charge transfer; optical properties of solution species; polyiodide plumbates}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{20}},
  pages        = {{2327--2333}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{ChemPhysChem}},
  title        = {{Building Blocks of Hybrid Perovskites : A Photoluminescence Study of Lead-Iodide Solution Species}},
  url          = {{http://dx.doi.org/10.1002/cphc.202000479}},
  doi          = {{10.1002/cphc.202000479}},
  volume       = {{21}},
  year         = {{2020}},
}