Journal of Physical Chemistry Letters, volume 6, issue 19, pages 3915-3922
Origin of Unusual Excitonic Absorption and Emission from Colloidal Ag2S Nanocrystals: Ultrafast Photophysics and Solar Cell.
Publication type: Journal Article
Publication date: 2015-09-17
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 5.7
ISSN: 19487185, 19487185
Physical and Theoretical Chemistry
General Materials Science
Abstract
Colloidal Ag2S nanocrystals (NCs) typically do not exhibit sharp excitonic absorption and emission. We first elucidate the reason behind this problem by preparing Ag2S NCs from nearly monodisperse CdS NCs employing cation exchange reaction. It was found that the defect-related midgap transitions overlap with excitonic transition, blurring the absorption spectrum. On the basis of this observation, we prepared nearly defect-free Ag2S NCs using molecular precursors. These defect-free Ag2S NCs exhibit sharp excitonic absorption, emission (quantum yield 20%) in near-infrared (853 nm) region, and improved performance of Ag2S quantum-dot-sensitized solar cells (QDSSCs). Samples with lower defects exhibit photoconversion efficiencies >1% and open circuit voltage of ∼0.3 V, which are better compared with prior reports of Ag2S QDSSCs. Femtosecond transient absorption shows pump-probe two-photon absorption above 630 nm and slow-decaying excited state absorption below 600 nm. Concomitantly, open-aperture z-scan shows strong two-photon absorption at 532 nm (coefficient 55 ± 3 cm/GW).
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Citations by publishers
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The Electrochemical Society
1 publication, 1.45%
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1 publication, 1.45%
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Taylor & Francis
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1 publication, 1.45%
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- We do not take into account publications without a DOI.
- Statistics recalculated only for publications connected to researchers, organizations and labs registered on the platform.
- Statistics recalculated weekly.
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Mir W. J. et al. Origin of Unusual Excitonic Absorption and Emission from Colloidal Ag2S Nanocrystals: Ultrafast Photophysics and Solar Cell. // Journal of Physical Chemistry Letters. 2015. Vol. 6. No. 19. pp. 3915-3922.
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Mir W. J., Swarnkar A., Sharma R., Katti A., Adarsh K. V., Nag A. Origin of Unusual Excitonic Absorption and Emission from Colloidal Ag2S Nanocrystals: Ultrafast Photophysics and Solar Cell. // Journal of Physical Chemistry Letters. 2015. Vol. 6. No. 19. pp. 3915-3922.
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TY - JOUR
DO - 10.1021/acs.jpclett.5b01692
UR - https://doi.org/10.1021/acs.jpclett.5b01692
TI - Origin of Unusual Excitonic Absorption and Emission from Colloidal Ag2S Nanocrystals: Ultrafast Photophysics and Solar Cell.
T2 - Journal of Physical Chemistry Letters
AU - Katti, Aditya
AU - Mir, Wasim J.
AU - Swarnkar, Abhishek
AU - Sharma, Rituraj
AU - Adarsh, K. V.
AU - Nag, Angshuman
PY - 2015
DA - 2015/09/17 00:00:00
PB - American Chemical Society (ACS)
SP - 3915-3922
IS - 19
VL - 6
SN - 1948-7185
SN - 1948-7185
ER -
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@article{2015_Mir,
author = {Aditya Katti and Wasim J. Mir and Abhishek Swarnkar and Rituraj Sharma and K. V. Adarsh and Angshuman Nag},
title = {Origin of Unusual Excitonic Absorption and Emission from Colloidal Ag2S Nanocrystals: Ultrafast Photophysics and Solar Cell.},
journal = {Journal of Physical Chemistry Letters},
year = {2015},
volume = {6},
publisher = {American Chemical Society (ACS)},
month = {sep},
url = {https://doi.org/10.1021/acs.jpclett.5b01692},
number = {19},
pages = {3915--3922},
doi = {10.1021/acs.jpclett.5b01692}
}
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MLA
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Mir, Wasim J., et al. “Origin of Unusual Excitonic Absorption and Emission from Colloidal Ag2S Nanocrystals: Ultrafast Photophysics and Solar Cell..” Journal of Physical Chemistry Letters, vol. 6, no. 19, Sep. 2015, pp. 3915-3922. https://doi.org/10.1021/acs.jpclett.5b01692.