Ultrafast Optical Dynamics of Metal-Free and Cobalt Phthalocyanine Thin Films

2010 ◽  
Vol 114 (9) ◽  
pp. 4086-4092 ◽  
Author(s):  
A. Gadalla ◽  
O. Crégut ◽  
M. Gallart ◽  
B. Hönerlage ◽  
J.-B. Beaufrand ◽  
...  
Keyword(s):  
Thin Films ◽  
Cobalt Phthalocyanine ◽  
Metal Free ◽  
Ultrafast Optical

Ultrafast Optical Dynamics of Metal-Free and Cobalt Phthalocyanine Thin Films II: Study of Excited-State Dynamics

2010 ◽  
Vol 114 (41) ◽  
pp. 17854-17863 ◽  
Author(s):  
Atef Gadalla ◽  
Jean-Baptiste Beaufrand ◽  
Martin Bowen ◽  
Samy Boukari ◽  
Eric Beaurepaire ◽  
...  
Keyword(s):  
Thin Films ◽  
Excited State ◽  
Cobalt Phthalocyanine ◽  
Excited State Dynamics ◽  
Metal Free ◽  
Ultrafast Optical

scholarly journals Giant room temperature elastocaloric effect in metal-free thin-film perovskites

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Cheng Li ◽  
Yu Hui Huang ◽  
Jian-Jun Wang ◽  
Bo Wang ◽  
Yong Jun Wu ◽  
...  
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Room Temperature ◽  
Entropy Change ◽  
Stress Change ◽  
Chemical Doping ◽  
Metal Free ◽  
Organic Ferroelectrics ◽  
Potential Applications ◽  
Unit Stress

AbstractSolid-state refrigeration which is environmentally benign has attracted considerable attention. Mechanocaloric (mC) materials, in which the phase transitions can be induced by mechanical stresses, represent one of the most promising types of solid-state caloric materials. Herein, we have developed a thermodynamic phenomenological model and predicted extraordinarily large elastocaloric (eC) strengths for the (111)-oriented metal-free perovskite ferroelectric [MDABCO](NH4)I3 thin-films. The predicted room temperature isothermal eC ΔSeC/Δσ (eC entropy change under unit stress change) and adiabatic eC ΔTeC/Δσ (eC temperature change under unit stress change) for [MDABCO](NH4)I3 are −60.0 J K−1 kg−1 GPa−1 and 17.9 K GPa−1, respectively, which are 20 times higher than the traditional ferroelectric oxides such as BaTiO3 thin films. We have also demonstrated that the eC performance can be improved by reducing the Young’s modulus or enhancing the thermal expansion coefficient (which could be realized through chemical doping, etc.). We expect these discoveries to spur further interest in the potential applications of metal-free organic ferroelectrics materials towards next-generation eC refrigeration devices.

Paramagnetic Character in Thin Films of Metal-Free Organic Magnets Deposited on TiO2(110) Single Crystals

2013 ◽  
Vol 117 (50) ◽  
pp. 26675-26679 ◽  
Author(s):  
Reza Kakavandi ◽  
Sabine-Antonia Savu ◽  
Andrea Caneschi ◽  
Maria Benedetta Casu
Keyword(s):  
Thin Films ◽  
Single Crystals ◽  
Metal Free ◽  
Organic Magnets

Space-charge-limited conductivity in evaporated α-form metal-free phthalocyanine thin films

Vacuum ◽  
1998 ◽  
Vol 50 (1-2) ◽  
pp. 53-56 ◽  
Author(s):  
N Aimai ◽  
R.D. Gould ◽  
AM Saleh
Keyword(s):  
Thin Films ◽  
Space Charge ◽  
Metal Free ◽  
Space Charge Limited

Magnetic behavior in metal-free radical thin films

Chem ◽  
2021 ◽  
Author(s):  
Tobias Junghoefer ◽  
Arrigo Calzolari ◽  
Ivan Baev ◽  
Mathias Glaser ◽  
Francesca Ciccullo ◽  
...  
Keyword(s):  
Thin Films ◽  
Free Radical ◽  
Magnetic Behavior ◽  
Metal Free

Surface effects in ultrafast optical phenomena of perovskite oxide thin films (Conference Presentation)

2020 ◽  
Author(s):  
Saeed Yousefi Sarraf ◽  
Sobhit Singh ◽  
Andrés Camilo Garcia-Castro ◽  
Robbyn Trappen ◽  
Navid Mottaghi ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Effects ◽  
Perovskite Oxide ◽  
Oxide Thin Films ◽  
Ultrafast Optical ◽  
Optical Phenomena ◽  
Perovskite Oxide Thin Films

Efficiency Enhancement in Organic Solar Cells by Use of Cobalt Phthalocyanine (CoPc) Thin Films

2020 ◽  
Vol 20 (6) ◽  
pp. 3703-3709 ◽  
Author(s):  
S. S. Rawat ◽  
Ashish Kumar ◽  
R. Srivastava ◽  
C. K. Suman
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Energy Level ◽  
Buffer Layer ◽  
Organic Solar Cells ◽  
Fill Factor ◽  
Series Resistance ◽  
Short Circuit ◽  
Acid Methyl Ester ◽  
Cobalt Phthalocyanine

Cobalt phthalocyanine (CoPc) nano thin films have been introduced as a hole buffer layer in organic solar cells with active layer of Poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). The surface morphology and opto-electrical properties of the CoPc thin films have made it an applicable materials for organic solar cells. The nano-thin films of CoPc are continuously distributed over the studied area and the roughness are around 5 to 7 nm for all thickness. The dominant optical absorptions are in the visible range of wavelengths 500 to 800 nm. The CoPc buffer layer is suitable for energy level matching in energy level diagram and enhances the absorption spectrum as well, which facilitate the charge carrier generation, increases charge transport, decreases charge recombination, hence enhance the all device parameters short circuit current density (Jsc), open circuit voltage (Voc) and fill factor (FF). The solar cells efficiency increases by ˜70% and the fill factor increases by ˜45% in comparison to the standard cells. The increase in efficiency and the fill factors of the solar cells may also be attributed to the increasing of shunt and lowering the series resistance of the cells. The cole–cole plots of the devices may be modeled in electrical circuit as a single parallel resistance Rb and capacitance Cb network with a series resistance Rc.

Bending stress induced improved chemiresistive gas sensing characteristics of flexible cobalt-phthalocyanine thin films

2013 ◽  
Vol 102 (13) ◽  
pp. 132107 ◽  
Author(s):  
Ajay Singh ◽  
Ashwini Kumar ◽  
Arvind Kumar ◽  
S. Samanta ◽  
Nirav Joshi ◽  
...  
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Cobalt Phthalocyanine ◽  
Bending Stress ◽  
Sensing Characteristics

Flexible cobalt-phthalocyanine thin films with high charge carrier mobility

2012 ◽  
Vol 101 (22) ◽  
pp. 222102 ◽  
Author(s):  
Ajay Singh ◽  
Arvind Kumar ◽  
Ashwini Kumar ◽  
Soumen Samanta ◽  
Anil K. Debnath ◽  
...  
Keyword(s):  
Thin Films ◽  
Charge Carrier ◽  
Carrier Mobility ◽  
Charge Carrier Mobility ◽  
Cobalt Phthalocyanine ◽  
High Charge ◽  
High Charge Carrier Mobility
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