45
IRUS Total
Downloads
  Altmetric

Role of microstructure in the electron-hole interaction of hybrid lead halide perovskites

File Description SizeFormat 
NIHMS64183.pdfAccepted version18.86 MBAdobe PDFView/Open
Title: Role of microstructure in the electron-hole interaction of hybrid lead halide perovskites
Authors: Grancini, G
Kandada, ARS
Frost, JM
Barker, AJ
De Bastiani, M
Gandini, M
Marras, S
Lanzani, G
Walsh, A
Petrozza, A
Item Type: Journal Article
Abstract: Organic–inorganic metal halide perovskites have demonstrated high power conversion efficiencies in solar cells and promising performance in a wide range of optoelectronic devices. The existence and stability of bound electron–hole pairs in these materials and their role in the operation of devices with different architectures remains a controversial issue. Here we demonstrate, through a combination of optical spectroscopy and multiscale modelling as a function of the degree of polycrystallinity and temperature, that the electron–hole interaction is sensitive to the microstructure of the material. The long-range order is disrupted by polycrystalline disorder and the variations in electrostatic potential found for smaller crystals suppress exciton formation, while larger crystals of the same composition demonstrate an unambiguous excitonic state. We conclude that fabrication procedures and morphology strongly influence perovskite behaviour, with both free carrier and excitonic regimes possible, with strong implications for optoelectronic devices.
Issue Date: 17-Aug-2015
Date of Acceptance: 13-Jul-2015
URI: http://hdl.handle.net/10044/1/50728
DOI: https://dx.doi.org/10.1038/NPHOTON.2015.151
ISSN: 1749-4885
Publisher: Nature Publishing Group
Start Page: 695
End Page: 701
Journal / Book Title: Nature Photonics
Volume: 9
Issue: 10
Copyright Statement: © 2015, Rights Managed by Nature Publishing Group.
Keywords: Science & Technology
Physical Sciences
Optics
Physics, Applied
Physics
QUANTUM-WELL STRUCTURES
SOLAR-CELLS
CHARGE-CARRIERS
SINGLE-CRYSTALS
BLUE-SHIFT
EFFICIENCY
SEMICONDUCTORS
CH3NH3PBI3
DEPENDENCE
DIFFUSION
Optoelectronics & Photonics
02 Physical Sciences
01 Mathematical Sciences
Publication Status: Published
Appears in Collections:Materials