A multidonor–photosensitizer–multiacceptor triad for long-lived directional charge separation

2017 ◽  
Vol 19 (42) ◽  
pp. 28572-28578 ◽  
Author(s):  
Tina Schlotthauer ◽  
Robert Schroot ◽  
Starla Glover ◽  
Leif Hammarström ◽  
Michael Jäger ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Charge Separation ◽  
Selective Excitation ◽  
Unit Charge ◽  
Donor And Acceptor

A modular chemistry-on-the complex strategy was applied to assemble a defined block-copolymer-type architecture. After selective excitation of the central photosensitizer unit, charge separation up to several microseconds was observed between the discrete donor and acceptor chains.

Extending Long-lived Charge Separation Between Donor and Acceptor Blocks in Novel Copolymer Architectures Featuring a Sensitizer Core

2017 ◽  
Vol 23 (65) ◽  
pp. 16484-16490 ◽  
Author(s):  
Robert Schroot ◽  
Tina Schlotthauer ◽  
Benjamin Dietzek ◽  
Michael Jäger ◽  
Ulrich S. Schubert
Keyword(s):  
Charge Separation ◽  
Donor And Acceptor

Low Band-Gap Materials for Solar Cells

2021 ◽  
pp. 176-235
Keyword(s):  
Solar Cells ◽  
Band Gap ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Chemical Properties ◽  
Low Energy ◽  
Practical Applications ◽  
Film Forming ◽  
Donor And Acceptor ◽  
Induced Charge

Organic solar cells (OSCs) are discussed at length in terms of its performance leading to the generation of electricity. The key materials required for OSCs are the small organic molecules having donor and acceptor with suitable light absorption and electro-chemical properties of low energy band gap. Various structural scaffolds are highlighted with their structural design leading to film forming in an orderly manner and this morphology of film having a pivotal role in photo-induced charge separation, migration and collection at an electrode. Present day research informs that OSCs involving non fullerene based donors and acceptors are functioning with high photo conversion efficiency [PCE] of >17% and are promising candidates for practical applications.

Charge separation and recombination in self-organizing nanostructured donor–acceptor block copolymer films

2009 ◽  
Vol 19 (30) ◽  
pp. 5436 ◽  
Author(s):  
Simon King ◽  
Michael Sommer ◽  
Sven Huettner ◽  
Mukundan Thelakkat ◽  
Saif A. Haque
Keyword(s):  
Block Copolymer ◽  
Charge Separation ◽  
Copolymer Films ◽  
Donor Acceptor ◽  
Self Organizing

Ultrafast charge separation and exciplex formation induced by strong interaction between electron donor and acceptor at short distances

2000 ◽  
Vol 112 (16) ◽  
pp. 7111-7117 ◽  
Author(s):  
Shinichiro Iwai ◽  
Shigeo Murata ◽  
Ryuzi Katoh ◽  
M. Tachiya ◽  
Koichi Kikuchi ◽  
...  
Keyword(s):  
Electron Donor ◽  
Strong Interaction ◽  
Charge Separation ◽  
Exciplex Formation ◽  
Donor And Acceptor ◽  
Electron Donor And Acceptor

Kinetic model for photoluminescence quenching by selective excitation of D/A blends: implications for charge separation in fullerene and non-fullerene organic solar cells

2020 ◽  
Vol 8 (26) ◽  
pp. 8755-8769 ◽  
Author(s):  
L. Benatto ◽  
M. de Jesus Bassi ◽  
L. C. Wouk de Menezes ◽  
L. S. Roman ◽  
M. Koehler
Keyword(s):  
Solar Cells ◽  
Kinetic Model ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Separation Efficiency ◽  
Selective Excitation ◽  
Photoluminescence Quenching ◽  
Charge Separation Efficiency

Our findings demonstrate the importance of kinetic factors in determining the overall charge separation efficiency in D/A systems.

Nanometer-Scaled Landscape of Polymer:Fullerene Blends Mapped with Visible s-SNOM

2021 ◽  
Author(s):  
Ya-Rong Lee ◽  
Cheng-Chia Huang ◽  
Wen-Yu Huang ◽  
Chin-Ti Chen ◽  
Ping-Tsung Huang ◽  
...  
Keyword(s):  
Active Layer ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
High Performance ◽  
Bulk Heterojunction ◽  
Near Field ◽  
Photovoltaic Performance ◽  
Energy Landscapes ◽  
Donor And Acceptor ◽  
Shed Light

Abstract Bulk heterojunction is one key concept leading to breakthrough in organic photovoltaics. The active layer is expectantly formed of distinct morphologies that carry out their respective roles in photovoltaic performance. The morphology-performance relationship however remains stymied, because unequivocal morphology at the nanoscale is not available. We used scattering-type scanning near-field optical microscopy operating with a visible light source (visible s-SNOM) to disclose the nanomorphology of P3HT:PCBM and pBCN:PCBM blends. Donor and acceptor domain as well as intermixed phase were identified and their intertwined distributions were mapped. We proposed energy landscapes of the BHJ active layer to shed light on the roles played by these morphologies in charge separation, transport and recombination. This study shows that visible s-SNOM is capable of profiling the morphological backdrop pertaining to the operation of high performance organic solar cells.

scholarly journals Frontispiece: Extending Long-lived Charge Separation Between Donor and Acceptor Blocks in Novel Copolymer Architectures Featuring a Sensitizer Core

2017 ◽  
Vol 23 (65) ◽  
Author(s):  
Robert Schroot ◽  
Tina Schlotthauer ◽  
Benjamin Dietzek ◽  
Michael Jäger ◽  
Ulrich S. Schubert
Keyword(s):  
Charge Separation ◽  
Donor And Acceptor

Transient states in photoinduced electron transfer reactions of porphyrin- and phthalocyanine-fullerene dyads

2009 ◽  
Vol 13 (10) ◽  
pp. 1090-1097 ◽  
Author(s):  
Helge Lemmetyinen ◽  
Nikolai Tkachenko ◽  
Alexander Efimov ◽  
Marja Niemi
Keyword(s):  
Electron Transfer ◽  
Charge Separation ◽  
Photoinduced Electron Transfer ◽  
Transient State ◽  
Primary Electron ◽  
Transfer Reactions ◽  
Acceptor Pair ◽  
Electron Transfer Reactions ◽  
Exciplex Formation ◽  
Donor And Acceptor

This paper combines the most important results on studies performed by the authors during the last decade on photoinduced electron transfer reactions of pheophytin-, phthalocyanine-, and porphyrin-fullerene dyads, in which donor and acceptor moieties are covalently linked to each other. Practically all studied molecules form an intramolecular exciplex as a transient state before the formation of the charge separation state or tight ion pair. When the center-to-center distance of the donor and acceptor pair is short (7–10 Å) both the exciplex formation and primary electron transfer are extremely fast with rate constants of 7–23 × 1012 s -1 and 40–1400 × 109 s -1, respectively. Rates become slower when the distance and orientational fluctuation increases. No systematic correlation between free energies and the rates of the formation and recombination of the exciplex and the charge separation state, respectively, were observed. The mechanism is discussed in frames of the Marcus electron transfer and the radiationless quantum transition theories.

Shape-persistent poly-porphyrins assembled by a central truxene: synthesis, structure, and singlet energy transfer behaviors

2013 ◽  
Vol 17 (01n02) ◽  
pp. 44-55 ◽  
Author(s):  
Hai-Jun Xu ◽  
Bin Du ◽  
Claude P. Gros ◽  
Philippe Richard ◽  
Jean-Michel Barbe ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Lifetime ◽  
Time Scale ◽  
Selective Excitation ◽  
Methyl Groups ◽  
Flexible Systems ◽  
Relative Rigidity ◽  
Energy Donor ◽  
Donor And Acceptor

Four dyad systems composed of a central truxene and either one or three β-substituted zinc(II) porphyrins (ZnP: TruZnP (7) and TruTriZnP (9)) or free-bases (H2P: TruP (6) and TruTriP (8)) have been prepared. The presence of β-methyl groups minimizes π-conjugation through the quasi right angle made by the porphyrin and the truxene planes, and renders these dyads relatively rigid. The position of the absorption and emission 0–0 peaks confirms the role of the truxene and porphyrin as the energy donor and acceptor, respectively. Selective excitation of the truxene results in an efficient singlet energy transfer (S1 ET) from the truxene to the porphyrin unit. The rates for S1 ET (k ET ) are extracted from the change in the fluorescence lifetime of truxene in the presence and absence of the acceptor, and are temperature independent, (TruP (6), TruTriP (8), TruZnP (7) and TruTriZnP (9) are 5.0, 1.4, 1.0 and 1.4 at 298 K and 5.9, 1.3, 2.6, and 0.86 (ns)-1 at 77 K, respectively), consistent with their relative rigidity. These k ET 's are similar to other related but more flexible systems reported by one of us (Inorg. Chem.2011, 50, 11493–11505). The k ET 's time scale was assumed, based on modeling, to be related with hindered rotations about the truxene-porphyrin C–C bonds due to steric hexyl–hexyl interactions. This work confirms this earlier conclusion was correct.

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