Vectorial Charge Separation and Selective Triplet-State Formation during Charge Recombination in a Pyrrolyl-Bridged BODIPY–Fullerene Dyad

2015 ◽  
Vol 119 (15) ◽  
pp. 8095-8102 ◽  
Author(s):  
Venugopal Bandi ◽  
Habtom B. Gobeze ◽  
Vellanki Lakshmi ◽  
Mangalampalli Ravikanth ◽  
Francis D’Souza
Keyword(s):  
Triplet State ◽  
State Formation ◽  
Charge Separation ◽  
Charge Recombination

scholarly journals Ultrafast Charge and Triplet State Formation in Diketopyrrolopyrrole Low Band Gap Polymer/Fullerene Blends: Influence of Nanoscale Morphology of Organic Photovoltaic Materials on Charge Recombination to the Triplet State

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
René M. Williams ◽  
Hung-Cheng Chen ◽  
Daniele Di Nuzzo ◽  
Stephan C. J. Meskers ◽  
René A. J. Janssen
Keyword(s):  
Triplet State ◽  
Band Gap ◽  
State Formation ◽  
Laser Fluence ◽  
Charge Recombination ◽  
Organic Photovoltaic ◽  
Low Band Gap ◽  
Photovoltaic Materials ◽  
Organic Photovoltaic Materials ◽  
Low Band Gap Polymer

Femtosecond transient absorption spectroscopy of thin films of two types of morphologies of diketopyrrolopyrrole low band gap polymer/fullerene-adduct blends is presented and indicates triplet state formation by charge recombination, an important loss channel in organic photovoltaic materials. At low laser fluence (approaching solar intensity) charge formation characterized by a 1350 nm band (in ~250 fs) dominates in the two PDPP-PCBM blends with different nanoscale morphologies and these charges recombine to form a local polymer-based triplet state on the sub-ns timescale (in ~300 and ~900 ps) indicated by an 1100 nm absorption band. The rate of triplet state formation is influenced by the morphology. The slower rate of charge recombination to the triplet state (in ~900 ps) belongs to a morphology that results in a higher power conversion efficiency in the corresponding device. Nanoscale morphology not only influences interfacial area and conduction of holes and electrons but also influences the mechanism of intersystem crossing (ISC). We present a model that correlates morphology to the exchange integral and fast and slow mechanisms for ISC (SOCT-ISC and H-HFI-ISC). For the pristine polymer, a flat and unstructured singlet-singlet absorption spectrum (between 900 and 1400 nm) and a very minor triplet state formation (5%) are observed at low laser fluence.

Selective Triplet-State Formation during Charge Recombination in a Fullerene/Bodipy Molecular Dyad (Bodipy=Borondipyrromethene)

2009 ◽  
Vol 15 (30) ◽  
pp. 7382-7393 ◽  
Author(s):  
Raymond Ziessel ◽  
Ben D. Allen ◽  
Dorota B. Rewinska ◽  
Anthony Harriman
Keyword(s):  
Triplet State ◽  
State Formation ◽  
Charge Recombination

Photoinduced Charge Separation and Charge Recombination to a Triplet State in a Carotene−Porphyrin−Fullerene Triad

1997 ◽  
Vol 119 (6) ◽  
pp. 1400-1405 ◽  
Author(s):  
Paul A. Liddell ◽  
Darius Kuciauskas ◽  
John P. Sumida ◽  
Boaz Nash ◽  
Dorothy Nguyen ◽  
...  
Keyword(s):  
Triplet State ◽  
Charge Separation ◽  
Charge Recombination ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge

Charge separation, charge recombination, long-lived charge transfer state formation and intersystem crossing in organic electron donor/acceptor dyads

2019 ◽  
Vol 7 (39) ◽  
pp. 12048-12074 ◽  
Author(s):  
Yuqi Hou ◽  
Xue Zhang ◽  
Kepeng Chen ◽  
Dongyi Liu ◽  
Zhijia Wang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
State Formation ◽  
Charge Separation ◽  
Charge Recombination ◽  
Charge Transfer State ◽  
Intersystem Crossing ◽  
Organic Electron ◽  
Recent Developments ◽  
Donor Acceptor ◽  
Transfer State

The recent developments in charge separation, long-lived charge transfer state formation and charge recombination-induced intersystem crossing are summarized.

Effect of Aggregation on Bacteriochlorin a Triplet-state Formation: A Laser Flash Photolysis Study¶

2002 ◽  
Vol 76 (5) ◽  
pp. 480 ◽  
Author(s):  
Xavier Damoiseau ◽  
Francis Tfibel ◽  
Maryse Hoebeke ◽  
Marie-Pierre Fontaine-Aupart
Keyword(s):  
Triplet State ◽  
State Formation ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash

Time-Resolved EPR Study of Photoexcited Triplet-State Formation in Electron-Donor-Substituted Acridinium Ions

1996 ◽  
Vol 100 (9) ◽  
pp. 3312-3316 ◽  
Author(s):  
Hans van Willigen ◽  
Guilford Jones ◽  
Mohammad S. Farahat
Keyword(s):  
Triplet State ◽  
State Formation ◽  
Electron Donor ◽  
Time Resolved

scholarly journals How can infra-red excitation both accelerate and slow charge transfer in the same molecule?

2018 ◽  
Vol 9 (30) ◽  
pp. 6395-6405 ◽  
Author(s):  
Zheng Ma ◽  
Zhiwei Lin ◽  
Candace M. Lawrence ◽  
Igor V. Rubtsov ◽  
Panayiotis Antoniou ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Charge Separation ◽  
Charge Recombination ◽  
Recombination Rates ◽  
Infra Red ◽  
Induced Changes

A UV-IR-Vis 3-pulse study of infra-red induced changes to electron transfer (ET) rates in a donor–bridge–acceptor species finds that charge-separation rates are slowed, while charge-recombination rates are accelerated as a result of IR excitation during the reaction.

scholarly journals Charge-transfer heptamethine dyes for NIR singlet oxygen generation

2019 ◽  
Vol 55 (38) ◽  
pp. 5511-5514 ◽  
Author(s):  
John B. Jarman ◽  
Dennis A. Dougherty
Keyword(s):  
Charge Transfer ◽  
Triplet State ◽  
Singlet Oxygen ◽  
State Formation ◽  
Charge Transfer State ◽  
Previous Evidence ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
A Charge ◽  
Transfer State

A heptamethine-based charge-transfer dye was designed based on previous evidence of triplet state formation in orthogonal charge-transfer partners and calculations suggesting the formation of a charge-transfer state in heptamethine dye derivatives.

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