scholarly journals Probing Charge-Transfer and Short-Lived Triplet States of a Biosensitive Molecule, 2,6-ANS: Transient Absorption and Time-Resolved Spectroscopy

ACS Omega ◽  
2017 ◽  
Vol 2 (10) ◽  
pp. 6782-6785 ◽  
Author(s):  
Mohan Singh Mehata ◽  
Yang Yang ◽  
Keli Han
Keyword(s):  
Charge Transfer ◽  
Transient Absorption ◽  
Triplet States ◽  
Time Resolved ◽  
Time Resolved Spectroscopy

scholarly journals The role of spin in the degradation of organic photovoltaics

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ivan Ramirez ◽  
Alberto Privitera ◽  
Safakath Karuthedath ◽  
Anna Jungbluth ◽  
Johannes Benduhn ◽  
...  
Keyword(s):  
Transient Absorption ◽  
Bulk Heterojunction ◽  
Critical Factor ◽  
Model Systems ◽  
Transient Absorption Spectroscopy ◽  
Triplet States ◽  
Paramagnetic Resonance ◽  
Time Resolved ◽  
A Charge

AbstractStability is now a critical factor in the commercialization of organic photovoltaic (OPV) devices. Both extrinsic stability to oxygen and water and intrinsic stability to light and heat in inert conditions must be achieved. Triplet states are known to be problematic in both cases, leading to singlet oxygen production or fullerene dimerization. The latter is thought to proceed from unquenched singlet excitons that have undergone intersystem crossing (ISC). Instead, we show that in bulk heterojunction (BHJ) solar cells the photo-degradation of C60 via photo-oligomerization occurs primarily via back-hole transfer (BHT) from a charge-transfer state to a C60 excited triplet state. We demonstrate this to be the principal pathway from a combination of steady-state optoelectronic measurements, time-resolved electron paramagnetic resonance, and temperature-dependent transient absorption spectroscopy on model systems. BHT is a much more serious concern than ISC because it cannot be mitigated by improved exciton quenching, obtained for example by a finer BHJ morphology. As BHT is not specific to fullerenes, our results suggest that the role of electron and hole back transfer in the degradation of BHJs should also be carefully considered when designing stable OPV devices.

Synthesis and photophysical properties of extended π conjugated naphthalimides

2017 ◽  
Vol 16 (4) ◽  
pp. 539-546 ◽  
Author(s):  
C. Rémy ◽  
C. Allain ◽  
I. Leray
Keyword(s):  
Charge Transfer ◽  
Dft Calculations ◽  
Photophysical Properties ◽  
Photoinduced Charge Transfer ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Td Dft ◽  
Photoinduced Charge

A series of π conjugated naphthalimide derivatives were prepared. Compounds display efficient photoinduced charge transfer in solution which was rationalized by time-resolved spectroscopy and modelled by TD-DFT calculations.

Time-resolved spectroscopy of charge transfer phenomena in organic solar cells

2015 ◽  
Author(s):  
Marina Gerhard ◽  
Andreas Arndt ◽  
Aina Quintilla ◽  
Arash Rahimi-Iman ◽  
Uli Lemmer ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Time Resolved ◽  
Time Resolved Spectroscopy

scholarly journals Time-Resolved Spectroscopy of the Metal-to-Metal Charge Transfer Excited State in Dinuclear Cyano-Bridged Mixed-Valence Complexes

2005 ◽  
Vol 44 (15) ◽  
pp. 5530-5536 ◽  
Author(s):  
Brendan P. Macpherson ◽  
Paul V. Bernhardt ◽  
Andreas Hauser ◽  
Stéphane Pagès ◽  
Eric Vauthey
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Mixed Valence ◽  
Time Resolved ◽  
Metal Charge ◽  
Time Resolved Spectroscopy ◽  
Metal Charge Transfer

Mapping of exciton–exciton annihilation in MEH-PPV by time-resolved spectroscopy: experiment and microscopic theory

2017 ◽  
Vol 19 (47) ◽  
pp. 31989-31996 ◽  
Author(s):  
Kilian Hader ◽  
Cristina Consani ◽  
Tobias Brixner ◽  
Volker Engel
Keyword(s):  
Transient Absorption ◽  
Laser Intensity ◽  
Microscopic Theory ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Spectroscopy Experiment ◽  
Exciton Annihilation

Transient absorption traces taken on samples of the polymer MEH-PPV are measured as a function of the laser intensity.

scholarly journals Correction: Spin mixed charge transfer states of iridium complex Ir(ppy)3: transient absorption and time-resolved photoluminescence

RSC Advances ◽  
2015 ◽  
Vol 5 (92) ◽  
pp. 75210-75210 ◽  
Author(s):  
Mohan Singh Mehata ◽  
Yang Yang ◽  
Zong-Jin Qu ◽  
Jun-Sheng Chen ◽  
Feng-Jiao Zhao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Transient Absorption ◽  
Iridium Complex ◽  
Time Resolved ◽  
Time Resolved Photoluminescence

Correction for ‘Spin mixed charge transfer states of iridium complex Ir(ppy)3: transient absorption and time-resolved photoluminescence’ by Mohan Singh Mehata et al., RSC Adv., 2015, 5, 34094–34099.

scholarly journals Transient absorption spectroscopy and photochemical reactivity of CAU-8

2015 ◽  
Vol 3 (15) ◽  
pp. 3607-3613 ◽  
Author(s):  
Herme G. Baldovi ◽  
Martin Krüger ◽  
Helge Reinsch ◽  
Mercedes Alvaro ◽  
Norbert Stock ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Time Resolved ◽  
Photochemical Reactivity ◽  
Time Resolved Spectroscopy

Time-resolved spectroscopy has provided evidence of the nature of the transients upon irradiation of CAU-8 and the photochemical reactivity has been used to promote styrene polymerisation and linker transformation.

Roles of adsorption sites in electron transfer from CdS quantum dots to molecular catalyst cobaloxime studied by time-resolved spectroscopy

2016 ◽  
Vol 18 (26) ◽  
pp. 17389-17397 ◽  
Author(s):  
Yun Ye ◽  
Yuxing Xu ◽  
Lei Huang ◽  
Dayong Fan ◽  
Zhaochi Feng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Cds Quantum Dots ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Molecular Catalyst ◽  
Adsorption Sites

Electron transfer from CdS quantum dots (QDs) to cobaloxime (Co(dmgH)2pyCl) is demonstrated by transient absorption spectroscopy (TAS), and further confirmed using photoluminescence (PL) techniques.

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