Time-resolved photoemission spectroscopy of electronic cooling and localization in CH3 NH3 PbI3 crystals
(2017) In Physical Review Materials 1(4).- Abstract
We measure the surface of CH3NH3PbI3 single crystals by making use of two-photon photoemission spectroscopy. Our method monitors the electronic distribution of photoexcited electrons, explicitly discriminating the initial thermalization from slower dynamical processes. The reported results disclose the fast-dissipation channels of hot carriers (0.25 ps), set an upper bound to the surface-induced recombination velocity (<4000 cm/s), and reveal the dramatic effect of shallow traps on the electrons dynamics. The picosecond localization of excited electrons in degraded CH3NH3PbI3 samples is consistent with the progressive reduction of photoconversion efficiency in operating devices. Minimizing the density of shallow traps and solving the... (More)
We measure the surface of CH3NH3PbI3 single crystals by making use of two-photon photoemission spectroscopy. Our method monitors the electronic distribution of photoexcited electrons, explicitly discriminating the initial thermalization from slower dynamical processes. The reported results disclose the fast-dissipation channels of hot carriers (0.25 ps), set an upper bound to the surface-induced recombination velocity (<4000 cm/s), and reveal the dramatic effect of shallow traps on the electrons dynamics. The picosecond localization of excited electrons in degraded CH3NH3PbI3 samples is consistent with the progressive reduction of photoconversion efficiency in operating devices. Minimizing the density of shallow traps and solving the aging problem may boost the macroscopic efficiency of solar cells to the theoretical limit.
(Less)
- author
- organization
- publishing date
- 2017-09
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review Materials
- volume
- 1
- issue
- 4
- article number
- 045402
- publisher
- American Physical Society
- external identifiers
-
- scopus:85049407738
- ISSN
- 2475-9953
- DOI
- 10.1103/PhysRevMaterials.1.045402
- language
- English
- LU publication?
- yes
- id
- d1914778-ea9d-4737-b87d-0aa80e312a19
- date added to LUP
- 2022-04-04 11:23:17
- date last changed
- 2022-04-20 01:10:09
@article{d1914778-ea9d-4737-b87d-0aa80e312a19, abstract = {{<p>We measure the surface of CH3NH3PbI3 single crystals by making use of two-photon photoemission spectroscopy. Our method monitors the electronic distribution of photoexcited electrons, explicitly discriminating the initial thermalization from slower dynamical processes. The reported results disclose the fast-dissipation channels of hot carriers (0.25 ps), set an upper bound to the surface-induced recombination velocity (<4000 cm/s), and reveal the dramatic effect of shallow traps on the electrons dynamics. The picosecond localization of excited electrons in degraded CH3NH3PbI3 samples is consistent with the progressive reduction of photoconversion efficiency in operating devices. Minimizing the density of shallow traps and solving the aging problem may boost the macroscopic efficiency of solar cells to the theoretical limit.</p>}}, author = {{Chen, Zhesheng and Lee, Min I. and Zhang, Zailan and Diab, Hiba and Garrot, Damien and Lédée, Ferdinand and Fertey, Pierre and Papalazarou, Evangelos and Marsi, Marino and Ponseca, Carlito and Deleporte, Emmanuelle and Tejeda, Antonio and Perfetti, Luca}}, issn = {{2475-9953}}, language = {{eng}}, number = {{4}}, publisher = {{American Physical Society}}, series = {{Physical Review Materials}}, title = {{Time-resolved photoemission spectroscopy of electronic cooling and localization in CH3 NH3 PbI3 crystals}}, url = {{http://dx.doi.org/10.1103/PhysRevMaterials.1.045402}}, doi = {{10.1103/PhysRevMaterials.1.045402}}, volume = {{1}}, year = {{2017}}, }