scholarly journals Femtosecond Transient Absorption Microscopy of Singlet Exciton Motion in Side-Chain Engineered Perylene-Diimide Thin Films

2020 ◽  
Vol 124 (13) ◽  
pp. 2721-2730 ◽  
Author(s):  
Raj Pandya ◽  
Richard Y. S. Chen ◽  
Qifei Gu ◽  
Jeffrey Gorman ◽  
Florian Auras ◽  
...  
Keyword(s):  
Thin Films ◽  
Transient Absorption ◽  
Perylene Diimide ◽  
Side Chain ◽  
Singlet Exciton ◽  
Femtosecond Transient Absorption

Femtosecond Transient Absorption Spectroscopy in α-sexithienyl thin films

1999 ◽  
Vol 101 (1-3) ◽  
pp. 555-556 ◽  
Author(s):  
G. Wegmann ◽  
R.F. Mahrt ◽  
H. Bässler ◽  
H. Giessen ◽  
M. Murgia ◽  
...  
Keyword(s):  
Thin Films ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Femtosecond Transient Absorption ◽  
Femtosecond Transient Absorption Spectroscopy

Morphology-Independent Efficient Singlet Exciton Fission in Perylene Diimide Thin Films

ChemPlusChem ◽  
2018 ◽  
Vol 83 (4) ◽  
pp. 230-238 ◽  
Author(s):  
Yaroslav V. Aulin ◽  
Kevin M. Felter ◽  
D. Deniz Günbas ◽  
Rajeev K. Dubey ◽  
Wolter F. Jager ◽  
...  
Keyword(s):  
Thin Films ◽  
Perylene Diimide ◽  
Singlet Exciton ◽  
Singlet Exciton Fission

scholarly journals A helical perylene diimide-based acceptor for non-fullerene organic solar cells: synthesis, morphology and exciton dynamics

2018 ◽  
Vol 5 (5) ◽  
pp. 172041 ◽  
Author(s):  
Li Chen ◽  
Mingliang Wu ◽  
Guangwei Shao ◽  
Jiahua Hu ◽  
Guiying He ◽  
...  
Keyword(s):  
Solar Cells ◽  
Thermal Annealing ◽  
Organic Solar Cells ◽  
Carrier Transport ◽  
Molecular Conformation ◽  
Transient Absorption ◽  
High Sensitivity ◽  
Perylene Diimide ◽  
Film Morphology ◽  
Femtosecond Transient Absorption

Helical perylene diimide-based (hPDI) acceptors have been established as one of the most promising candidates for non-fullerene organic solar cells (OSCs). In this work, we report a novel hPDI-based molecule, hPDI 2 -CN 2 , as an electron acceptor for OSCs. Combining the hPDI 2 -CN 2 with a low-bandgap polymeric donor (PTB7-Th), the blending film morphology exhibited high sensitivity to various treatments (such as thermal annealing and addition of solvent additives), as evidenced by atomic force microscope studies. The power conversion efficiency (PCE) was improved from 1.42% (as-cast device) to 2.76% after thermal annealing, and a PCE of 3.25% was achieved by further addition of 1,8-diiodooctane (DIO). Femtosecond transient absorption (TA) spectroscopy studies revealed that the improved thin-film morphology was highly beneficial for the charge carrier transport and collection. And a combination of fast exciton diffusion rate and the lowest recombination rate contributed to the best performance of the DIO-treated device. This result further suggests that the molecular conformation needs to be taken into account in the design of perylene diimide-based acceptors for OSCs.

scholarly journals Simplification of femtosecond transient absorption microscopy data from CH3NH3PbI3perovskite thin films into decay associated amplitude maps

2016 ◽  
Vol 27 (11) ◽  
pp. 114002 ◽  
Author(s):  
Benjamin Doughty ◽  
Mary Jane Simpson ◽  
Bin Yang ◽  
Kai Xiao ◽  
Ying-Zhong Ma
Keyword(s):  
Thin Films ◽  
Transient Absorption ◽  
Femtosecond Transient Absorption ◽  
Microscopy Data

Visualizing the impact of chloride addition on the microscopic carrier dynamics of MAPbI3 thin films using femtosecond transient absorption microscopy

2019 ◽  
Vol 151 (23) ◽  
pp. 234710 ◽  
Author(s):  
Jin Yu ◽  
Zhongguo Li ◽  
Charles Kolodziej ◽  
Seher Kuyuldar ◽  
Warren S. Warren ◽  
...  
Keyword(s):  
Thin Films ◽  
Transient Absorption ◽  
Carrier Dynamics ◽  
Femtosecond Transient Absorption ◽  
The Impact

scholarly journals Ultrafast spectroscopy reveals singlet fission, ionization and excimer formation in perylene film

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Wenjun Ni ◽  
Licheng Sun ◽  
Gagik G. Gurzadyan
Keyword(s):  
Radical Cation ◽  
Transient Absorption ◽  
Photovoltaic Devices ◽  
Singlet Fission ◽  
Time Resolved ◽  
Singlet Exciton ◽  
Femtosecond Transient Absorption ◽  
Photovoltaic Applications ◽  
Singlet Exciton Fission ◽  
Triplet Formation

AbstractSinglet exciton fission (SF) is a spin-allowed process whereby two triplet excitons are created from one singlet exciton. This phenomenon can offset UV photon energy losses and enhance the overall efficiency in photovoltaic devices. For this purpose, it requires photostable commercially available SF materials. Excited state dynamics in pure perylene film, ease of commercial production, is studied by time-resolved fluorescence and femtosecond transient absorption techniques under different photoexcitation energies. In film, polycrystalline regions contain perylene in H-type aggregate form. SF takes place from higher excited states of these aggregates in ultrafast time scale < 30 fs, reaching a triplet formation quantum yield of 108%. Moreover, at λex = 450 nm singlet fission was detected as a result of two-quantum absorption. Other competing relaxation channels are excimer (1 ps) and dimer radical cation formation (< 30 fs). Excimer radiatively relaxes within 19 ns and radical cation recombines in 3.2 ns. Besides, exciton self-trapping by crystal lattice distortions occurs within hundreds of picosecond. Our results highlight potential of simple-fabricated perylene films with similar properties as high-cost single crystal in SF based photovoltaic applications.

Real-Time Structural and Optical Study of Growth and Packing Behavior of Perylene Diimide Derivative Thin Films: Influence of Side-Chain Modification

2018 ◽  
Vol 122 (15) ◽  
pp. 8589-8601 ◽  
Author(s):  
Valentina Belova ◽  
Benjamin Wagner ◽  
Berthold Reisz ◽  
Clemens Zeiser ◽  
Giuliano Duva ◽  
...  
Keyword(s):  
Thin Films ◽  
Real Time ◽  
Perylene Diimide ◽  
Side Chain ◽  
Optical Study

scholarly journals Ultrafast Nonlinear Optical Response and Carrier Dynamics in Layered Gallium Sulfide (GaS) Single-Crystalline Thin Films

2021 ◽  
Vol 8 ◽  
Author(s):  
Haishuang Lu ◽  
Yu Chen ◽  
Kexin Yang ◽  
Yawei Kuang ◽  
Zhongguo Li ◽  
...  
Keyword(s):  
Thin Films ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Transient Absorption ◽  
Optical Response ◽  
Carrier Dynamics ◽  
Nonlinear Optical Response ◽  
Saturable Absorption ◽  
Gallium Sulfide ◽  
Femtosecond Transient Absorption

Gallium sulfide (GaS) is a layered metal monochalcogenide semiconductor that has recently garnered considerable attention in various fields. In this study, we investigated the nonlinear absorption characteristics of multilayer β-GaS thin films on sapphire substrate by using femtosecond open-aperture Z-scan method. The β-GaS films exhibit saturable absorption behavior at 532 nm while nonlinear absorption appears under 650 nm excitation. The nonlinear absorption coefficient of β-GaS was determined to be −1.8 × 10–8 m/W and 4.9 × 10–8 m/W at 532 and 650 nm, respectively. The carrier dynamics of β-GaS films was studied via femtosecond transient absorption (TA) measurements. The TA results demonstrated that β-GaS films have broad photo-induced absorption in the visible regime and sub-nanosecond lifetime. Our results indicate that gallium sulfide has large nonlinear optical response and long carrier lifetime, which could be applied in future photonic devices.

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