Decay of the Lowest Triplet State in Singlet-Fission Molecular Materials: A Case Study on Quinoidal Bithiophenes

2018 ◽  
Vol 122 (7) ◽  
pp. 3748-3755 ◽  
Author(s):  
Ruihong Duan ◽  
Qian Peng ◽  
Xingxing Shen ◽  
Guangchao Han ◽  
Yuan Guo ◽  
...  
Keyword(s):  
Triplet State ◽  
Molecular Materials ◽  
Singlet Fission

scholarly journals Unconventional Solar Energy: Singlet Fission

2019 ◽  
Vol 03 (01) ◽  
pp. 84-91 ◽  
Author(s):  
Josef Michl
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Solar Energy ◽  
Excitation Energy ◽  
Triplet State ◽  
Excited Molecule ◽  
Singlet Fission ◽  
Single Junction ◽  
Simple Rules ◽  
Solar Cell Material

Described simply, singlet fission is a process in which a singlet excited molecule transfers about half of its excitation energy to a neighbor molecule, both end up in their triplet state, and the two triplet excitations diffuse apart. The process is of interest for solar cells. Used in conjunction with ordinary solar cell material, a layer of singlet-fission material offers an opportunity to utilize higher energy photons more efficiently. The maximum theoretical efficiency is then close to 1/2 instead of the Shockley-Queisser value of 1/3 that applies to an ordinary single-junction cell. The problem that prevents an immediate production of singlet fission solar cells is the dearth of sufficiently stable efficient materials. The formulation of simple rules for the design of suitable compounds for the purpose is discussed.

Singlet fission molecules among known compounds: finding a few needles in a haystack

2019 ◽  
Vol 12 (8) ◽  
pp. 2412-2416 ◽  
Author(s):  
Daniele Padula ◽  
Ömer H. Omar ◽  
Tahereh Nematiaram ◽  
Alessandro Troisi
Keyword(s):  
Solar Cells ◽  
Large Set ◽  
Molecular Materials ◽  
Singlet Fission

A large set of candidates for singlet fission, one of the most promising processes able to improve the efficiency of solar cells, are identified by screening a database of known molecular materials.

Suppressing triplet decay in quinoidal singlet fission materials: the role of molecular planarity and rigidity

2020 ◽  
Vol 22 (14) ◽  
pp. 7546-7551
Author(s):  
Ruihong Duan ◽  
Guangchao Han ◽  
Yan Zeng ◽  
Qian Peng ◽  
Yuanping Yi
Keyword(s):  
Triplet State ◽  
Singlet Fission ◽  
Nonradiative Decay

The nonradiative decay of the lowest triplet state for quinoidal singlet fission materials can be effectively suppressed by increasing molecular planarity and rigidity.

scholarly journals Impact of Side-Chain Substituents on the Excited State Dynamics of Perylene Diimide Amorphous Films

2020 ◽  
Author(s):  
Qiu-Shi Ma ◽  
Cheng-Wei Ju ◽  
Ruihua Pu ◽  
Wenjie Zhang ◽  
Xian Lin ◽  
...  
Keyword(s):  
Excited State ◽  
Triplet State ◽  
Transient Absorption ◽  
Excited State Absorption ◽  
Perylene Diimide ◽  
Side Chain ◽  
Significant Feature ◽  
Singlet Fission ◽  
Amorphous Films ◽  
Excited State Dynamics

<p>Side-chain substitutions have important influence on the aggregation of perylene diimide (PDI), which show a great impact on their excited-state dynamics as well. Herein, by employing photoluminescence (PL), time-resolved photoluminescence (TRPL) and transient absorption (TA) spectroscopy, we investigated excited-state dynamics of two perylene diimide (PDI) derivative amorphous films, i.e. undecane-substituted PDI (PDI-1) and diisopropylphenyl-substituted PDI (PDI-2), fabricated with spin coating method. Femtosecond transient absorption spectra reveal that both films show pronounced ground state bleach (GSB) with lifetime longer than 10 ns while the relaxation of excited state absorption (ESA) has typical lifetime less than 1 ns. The significant feature of excited state decay in PDI-2 is dominated by transforming the singlet excited state into two triplet states via singlet fission, which is evidenced by the appearance of triplet state absorption. By contrast, the absence of triplet state absorption and the appearance of long-lived emission species in PDI-1 suggest that the decay of excited-like state could be dominated by the formation of excimer. Our present study reveals for the first time that the singlet fission does occur in amorphous PDI film, the study also demonstrates that side-chain substitutions have great impact on the excited-state dynamics of PDI. </p>

Efficient Singlet Fission in Nanoparticle of Amphipathic Anthracene-Tetracene Dyad with Broadband Light Harvesting Ability

2022 ◽  
Author(s):  
Xinyu Nie ◽  
Heyuan Liu ◽  
Weijie Wang ◽  
Pengkun Su ◽  
Jun Zhou ◽  
...  
Keyword(s):  
Triplet State ◽  
State Energy ◽  
Light Harvesting ◽  
Practical Application ◽  
Singlet Fission ◽  
Triplet State Energy

Efficient singlet fission (SF) materials with relatively high triplet state energy and broadband light harvesting ability simultaneously have a greater advantage for its practical application into photovoltaics. Herein, we prepared...

Coupled double triplet state in singlet fission

2018 ◽  
Vol 20 (48) ◽  
pp. 30083-30094 ◽  
Author(s):  
Hyungjun Kim ◽  
Paul M. Zimmerman
Keyword(s):  
Triplet State ◽  
Singlet Fission ◽  
Significant Attention ◽  
Double Triplet

The highly unusual state, 1(TT), is a coupled, double triplet state that has recently garnered significant attention.

Enacting Two-Electron Transfer from a Double-Triplet State of Intramolecular Singlet Fission

2018 ◽  
Vol 140 (25) ◽  
pp. 7760-7763 ◽  
Author(s):  
Hyungjun Kim ◽  
Bradley Keller ◽  
Rosina Ho-Wu ◽  
Neranga Abeyasinghe ◽  
Ricardo J. Vázquez ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Triplet State ◽  
Singlet Fission ◽  
Double Triplet

The Genesis and Internal Dynamics of El Salvador's People's Revolutionary Army, 1970–1976

2014 ◽  
Vol 38 (01) ◽  
pp. 102-129
Author(s):  
ALBERTO MARTÍN ÁLVAREZ ◽  
EUDALD CORTINA ORERO
Keyword(s):  
Latin America ◽  
El Salvador ◽  
Early Years ◽  
Left Wing ◽  
Internal Dynamics ◽  
Internal Coherence ◽  
The 1960S

AbstractUsing interviews with former militants and previously unpublished documents, this article traces the genesis and internal dynamics of the Ejército Revolucionario del Pueblo (People's Revolutionary Army, ERP) in El Salvador during the early years of its existence (1970–6). This period was marked by the inability of the ERP to maintain internal coherence or any consensus on revolutionary strategy, which led to a series of splits and internal fights over control of the organisation. The evidence marshalled in this case study sheds new light on the origins of the armed Salvadorean Left and thus contributes to a wider understanding of the processes of formation and internal dynamics of armed left-wing groups that emerged from the 1960s onwards in Latin America.

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