Building Blocks of Hybrid Perovskites : A Photoluminescence Study of Lead-Iodide Solution Species
(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
- Shargaieva, Oleksandra ; Kuske, Lena ; Rappich, Jörg ; Unger, Eva LU and Nickel, Norbert H.
- publishing date
- 2020-10-16
- 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
- 2024-09-20 14:34:30
@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}}, }