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Red-Shifted Photoluminescence from Crystal Edges Due to Carrier Redistribution and Reabsorption in Lead Triiodide Perovskites

Hong, Daocheng; Li, Jun LU ; Wan, Sushu; Scheblykin, Ivan G. LU and Tian, Yuxi LU (2019) In Journal of Physical Chemistry C 123(19). p.12521-12526
Abstract


Photoluminescence (PL) of CH
3
NH
3
PbI
3
perovskites depends strongly on sample preparation, atmosphere, crystal size, and so forth. However, the origin of these dependencies is always misunderstood because of the co-works of many different factors. Herein, we prepared... (More)


Photoluminescence (PL) of CH
3
NH
3
PbI
3
perovskites depends strongly on sample preparation, atmosphere, crystal size, and so forth. However, the origin of these dependencies is always misunderstood because of the co-works of many different factors. Herein, we prepared hexagonal-shaped single crystals with tens of micrometers in size and observed a red-shifted PL emission (800-830 nm) mainly from the crystal edges besides the usual band-to-band transition (760 nm) from the central regions. Also, significantly different time-resolved dynamics and excitation power dependencies were observed. To summarize, we conclude that the red-shifted component comes from the depth of the crystal, where monomolecular recombination occurs involving photogenerated charges and unintentional doped charges, while the normal PL is emitted by bimolecular recombination from the surface layers. These results showed the significance of pure optical effects in perovskite crystals and would promote detailed understanding of the charge dynamics and recombination in perovskite crystalline materials of different geometries and sizes.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
123
issue
19
pages
6 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85065824068
ISSN
1932-7447
DOI
10.1021/acs.jpcc.9b03647
language
English
LU publication?
yes
id
d591821b-5e9f-4787-a323-346d3e975072
date added to LUP
2019-05-28 10:19:43
date last changed
2019-06-25 03:54:24
@article{d591821b-5e9f-4787-a323-346d3e975072,
  abstract     = {<p><br>
                                                         Photoluminescence (PL) of CH                             <br>
                            <sub>3</sub><br>
                                                         NH                             <br>
                            <sub>3</sub><br>
                                                         PbI                             <br>
                            <sub>3</sub><br>
                                                          perovskites depends strongly on sample preparation, atmosphere, crystal size, and so forth. However, the origin of these dependencies is always misunderstood because of the co-works of many different factors. Herein, we prepared hexagonal-shaped single crystals with tens of micrometers in size and observed a red-shifted PL emission (800-830 nm) mainly from the crystal edges besides the usual band-to-band transition (760 nm) from the central regions. Also, significantly different time-resolved dynamics and excitation power dependencies were observed. To summarize, we conclude that the red-shifted component comes from the depth of the crystal, where monomolecular recombination occurs involving photogenerated charges and unintentional doped charges, while the normal PL is emitted by bimolecular recombination from the surface layers. These results showed the significance of pure optical effects in perovskite crystals and would promote detailed understanding of the charge dynamics and recombination in perovskite crystalline materials of different geometries and sizes.                         <br>
                        </p>},
  author       = {Hong, Daocheng and Li, Jun and Wan, Sushu and Scheblykin, Ivan G. and Tian, Yuxi},
  issn         = {1932-7447},
  language     = {eng},
  number       = {19},
  pages        = {12521--12526},
  publisher    = {The American Chemical Society (ACS)},
  series       = {Journal of Physical Chemistry C},
  title        = {Red-Shifted Photoluminescence from Crystal Edges Due to Carrier Redistribution and Reabsorption in Lead Triiodide Perovskites},
  url          = {http://dx.doi.org/10.1021/acs.jpcc.9b03647},
  volume       = {123},
  year         = {2019},
}