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Measuring internal quantum efficiency to demonstrate hot exciton dissociation

Measuring internal quantum efficiency to demonstrate hot exciton dissociation IQE (normalized) correspondence Measuring internal quantum efficiency to demonstrate hot exciton dissociation To the Editor — Grancini et al. reported Wavelength (nm) that “hot [charge transfer state] dissociation 800 700 600 500 produces an overall increase in the charge generation yield” in organic solar cells (OSCs) . If true, this is an important result as the process could dramatically improve 200 IQE-like spectrum 2 2,3 efficiencies. Hot excitons are a ‘hot’ topic , but was the increase in internal quantum efficiency (IQE) seen by Grancini  et al. really due to hot excitons? In this Correspondence we demonstrate that when interference and other optical effects are correctly accounted for, the apparent strong contribution from hot excitons is absent. 100 1 Hot excitons are generated by photons with energies greater than the optical gap of organic semiconductors. It has been postulated this extra energy aids separation True IQE of bound electron–hole pairs (excitons), leading to an increase in the ‘charge 1–3 generation yield’ . Grancini et al. report signatures of hot electron dissociation 1.6 2.02.4 2.8 in PCPDTBT:PC BM OSCs using time- Photon energy (eV) resolved spectroscopy. This central thesis also relies on steady-state measurements Figure 1 | IQE in OSCs. The true-IQE spectrum taking into http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Materials Springer Journals

Measuring internal quantum efficiency to demonstrate hot exciton dissociation

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Measuring internal quantum efficiency to demonstrate hot exciton dissociation

Abstract

IQE (normalized) correspondence Measuring internal quantum efficiency to demonstrate hot exciton dissociation To the Editor — Grancini et al. reported Wavelength (nm) that “hot [charge transfer state] dissociation 800 700 600 500 produces an overall increase in the charge generation yield” in organic solar cells (OSCs) . If true, this is an important result as the process could dramatically improve 200 IQE-like spectrum 2 2,3 efficiencies. Hot excitons are a...
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References (5)

Publisher
Springer Journals
Copyright
Copyright © 2013 by Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.
Subject
Materials Science; Materials Science, general; Optical and Electronic Materials; Biomaterials; Nanotechnology; Condensed Matter Physics
ISSN
1476-1122
eISSN
1476-4660
DOI
10.1038/nmat3692
Publisher site
See Article on Publisher Site

Abstract

IQE (normalized) correspondence Measuring internal quantum efficiency to demonstrate hot exciton dissociation To the Editor — Grancini et al. reported Wavelength (nm) that “hot [charge transfer state] dissociation 800 700 600 500 produces an overall increase in the charge generation yield” in organic solar cells (OSCs) . If true, this is an important result as the process could dramatically improve 200 IQE-like spectrum 2 2,3 efficiencies. Hot excitons are a ‘hot’ topic , but was the increase in internal quantum efficiency (IQE) seen by Grancini  et al. really due to hot excitons? In this Correspondence we demonstrate that when interference and other optical effects are correctly accounted for, the apparent strong contribution from hot excitons is absent. 100 1 Hot excitons are generated by photons with energies greater than the optical gap of organic semiconductors. It has been postulated this extra energy aids separation True IQE of bound electron–hole pairs (excitons), leading to an increase in the ‘charge 1–3 generation yield’ . Grancini et al. report signatures of hot electron dissociation 1.6 2.02.4 2.8 in PCPDTBT:PC BM OSCs using time- Photon energy (eV) resolved spectroscopy. This central thesis also relies on steady-state measurements Figure 1 | IQE in OSCs. The true-IQE spectrum taking into

Journal

Nature Materials – Springer Journals

Published: Jun 20, 2013

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