scholarly journals Creation of Hybrid Photoactive Inorganic/Organic Interface Assemblies of Cadmium Oxide mixtures (CdO2/CdO)/Poly-2,2-Bithiophene; Optical and Photoelectrochemical Investigations

2017 ◽  
Vol 9 (4) ◽  
pp. 71
Author(s):  
Kasem K. Kasem ◽  
Henry Worley ◽  
Ashley Lovins
Keyword(s):  
Charge Separation ◽  
Cadmium Oxide ◽  
Equilibrium Mixture ◽  
Organic Polymer ◽  
Aqueous Electrolytes ◽  
Charge Generation ◽  
Transfer Processes ◽  
Organic Interfaces ◽  
Band Alignments ◽  
Induced Charge

Nanoparticles of cadmium peroxide (CdO2) were immobilized in poly 2,2 bithiophene (PBTh) to build photoactive inorganic/organic interfaces (I/O/I). Studies indicated that the CdO2 initially immobilized in the organic polymer partially decomposed to a low band gap CdO. Therefore we refer to this mixture as CdO2/CdO. The CdO2/CdO/PBTh assemblies were subjected to optical and photoelectrochemical investigations in aqueous electrolytes containing acetate, nitrate, or phosphate. The equilibrium mixture of CdO2/CdO influenced the optical conductivity and dielectric contents of the assemblies. Furthermore, O2 played an important role in the charge separation and transfer processes. The effects of an applied magnetic field were investigated and reported. The results were explained on the basis of formation of hybrid sub-bands due to band alignments between the assembly components. The photo-induced charge generation of PBTh was improved by occlusion of CdO2 in the polymer as was evident by the greater photocurrent generated by CdO2/CdO/PBTh than that generated by PBTh.

scholarly journals Ultrafast electron and hole transfer in bulk heterojunctions of low-bandgap polymers

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Oleg V. Kozlov ◽  
Vlad G. Pavelyev ◽  
Hilde D. de Gier ◽  
Remco W. A. Havenith ◽  
Paul H.M. van Loosdrecht ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Level ◽  
Charge Separation ◽  
Density Functional ◽  
Free Charge ◽  
Charge Generation ◽  
Hole Transfer ◽  
Low Bandgap ◽  
Transfer Processes ◽  
Energy Level Alignment

AbstractIn modern bulk heterojunction (BHJ) organic solar cells, blends of low-bandgap polymer and [70]PCBM acceptor are used in the active layer. In this combination, the polymer absorbs photons from the red and near-IR parts of the solar spectrum, while the blue and near-UV photons are harvested by [70]PCBM. As a result, both electron transfer from polymer to [70]PCBM and hole transfer from [70]PCBM to polymer are of utmost importance in free charge generation and have to be optimized simultaneously. Here we study electron and hole transfer processes in BHJ blends of two low-bandgap polymers, BTT-DPP and PCPDTBT, by ultrafast photoinduced spectroscopy (PIA). By tracking the PIA dynamics, we observed substantially different charge separation pathways in BHJs of the two polymers with [70]PCBM. From the photoinduced anisotropy dynamics, we demonstrated that in the PCPDTBT:[70]PCBM system both electron and hole transfer processes are highly efficient, while in the BTTBPP:[ 70]PCBM electron transfer is blocked due to the unfortunate energy level alignment leaving hole transfer the only pathway to free charge generation. Calculations at the density functional theory level are used to gain more insight into our findings. The presented results highlight the importance of the energy level alignment on the charge separation process.

scholarly journals Controlling the oxidation state of molybdenum oxide nanoparticles prepared by ionic liquid/metal sputtering to enhance plasmon-induced charge separation

RSC Advances ◽  
2020 ◽  
Vol 10 (48) ◽  
pp. 28516-28522 ◽  
Author(s):  
Kazutaka Akiyoshi ◽  
Tatsuya Kameyama ◽  
Takahisa Yamamoto ◽  
Susumu Kuwabata ◽  
Tetsu Tatsuma ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Metal ◽  
Oxidation State ◽  
Molybdenum Oxide ◽  
Charge Separation ◽  
Room Temperature ◽  
Room Temperature Ionic Liquid ◽  
Oxide Nanoparticles ◽  
Induced Charge ◽  
Molybdenum Oxide Nanoparticles

MoOx NPs, prepared by sputtering Mo metal on a room-temperature ionic liquid (RTIL) followed by heating in air, produced anodic photocurrents with the excitation of their LSPR peak.

Hydrogen evolution from water based on plasmon-induced charge separation at a TiO2/Au/NiO/Pt system

2017 ◽  
Vol 19 (46) ◽  
pp. 31429-31435 ◽  
Author(s):  
Kun-Che Kao ◽  
Yoshinori Kuroiwa ◽  
Hiroyasu Nishi ◽  
Tetsu Tatsuma
Keyword(s):  
Hydrogen Evolution ◽  
Methanol Oxidation ◽  
Charge Separation ◽  
Au Nanoparticles ◽  
System P ◽  
Water Based ◽  
Induced Charge

Plasmonic Au nanoparticles inject electrons into TiO2 and reduce water to hydrogen at a Pt cathode. Positive charges left in the Au nanoparticles are extracted by NiO and used for methanol oxidation.

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