Interfacial Electron Transfer Dynamics for [Ru(bpy)2((4,4′-PO3H2)2bpy)]2+ Sensitized TiO2 in a Dye-Sensitized Photoelectrosynthesis Cell: Factors Influencing Efficiency and Dynamics

2011 ◽  
Vol 115 (14) ◽  
pp. 7081-7091 ◽  
Author(s):  
Wenjing Song ◽  
M. Kyle Brennaman ◽  
Javier J. Concepcion ◽  
Jonah W. Jurss ◽  
Paul G. Hoertz ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Interfacial Electron Transfer ◽  
Dye Sensitized ◽  
Factors Influencing

Improving interfacial electron transfer and light harvesting in dye-sensitized solar cells by using Ag nanowire/TiO2 nanoparticle composite films

RSC Advances ◽  
2015 ◽  
Vol 5 (86) ◽  
pp. 70172-70177 ◽  
Author(s):  
Po-Chun Huang ◽  
Tsan-Yao Chen ◽  
Yi-Lin Wang ◽  
Chiun-Yi Wu ◽  
Tsang-Lang Lin
Keyword(s):  
Electron Transfer ◽  
Solar Cells ◽  
Surface Plasmon Resonance ◽  
Composite Films ◽  
Dye Sensitized Solar Cells ◽  
Interfacial Electron Transfer ◽  
Dye Sensitized ◽  
Ag Nanowires ◽  
Sensitized Solar Cells ◽  
Ag Nanowire

TiO2 coated Ag nanowires improved the interfacial electron transfer, the surface plasmon resonance, and the light-scattering in dye-sensitized solar cells.

Interfacial electron transfer yields in dye-sensitized NiO photocathodes correlated to excited-state dipole orientation of ruthenium chromophores

2018 ◽  
Vol 96 (9) ◽  
pp. 865-874 ◽  
Author(s):  
Yejee Han ◽  
Robert J. Dillon ◽  
Cory J. Flynn ◽  
Eric S. Rountree ◽  
Leila Alibabaei ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Transient Absorption ◽  
Photovoltaic Performance ◽  
Interfacial Electron Transfer ◽  
Dipole Orientation ◽  
Ruthenium Polypyridyl ◽  
Dye Sensitized ◽  
Surface Enhanced ◽  
Device Efficiency

Interface dynamics of nanocrystalline NiO thin films sensitized with two ruthenium polypyridyl chromophores have been investigated to examine the influence that excited-state dipole orientation and the position of the bipyridine radical formed in the charge-separated state have on interfacial electron transfer yields. In ultrafast transient absorption experiments, the charge separated state is observed on the nanosecond timescale for the trifluoromethyl-substituted chromophore, [Ru(flpy)2(dcb)]2+ (flpy = 4,4′-bis(trifluoromethyl)-2,2′-bipyridine, dcb = 4,4′-dicarboxy-2,2′-bipyridine), but not for [Ru(bpy)2(dcb)]2+ (bpy = 2,2′-bipyridine). Differences are attributed to the positioning of the bipyridine radical formed in the charge separated state; for [Ru(flpy)2(dcb)]2+, the electron is localized on the flpy ligand distal to the surface, whereas for [Ru(bpy)2(dcb)]2+, the electron is localized on the dcb ligand, proximal to the NiO surface. Enhanced photovoltaic performance is observed for dye-sensitized solar cell devices prepared with [Ru(flpy)2(dcb)]2+, demonstrating that enhanced charge separation can be correlated with device efficiency.

ALD Grown Aluminum Oxide Submonolayers in Dye-Sensitized Solar Cells: The Effect on Interfacial Electron Transfer and Performance

2011 ◽  
Vol 115 (33) ◽  
pp. 16720-16729 ◽  
Author(s):  
Liisa J. Antila ◽  
Mikko J. Heikkilä ◽  
Ville Mäkinen ◽  
Niko Humalamäki ◽  
Mikko Laitinen ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Solar Cells ◽  
Aluminum Oxide ◽  
Dye Sensitized Solar Cells ◽  
Interfacial Electron Transfer ◽  
Dye Sensitized ◽  
And Performance ◽  
Sensitized Solar Cells

scholarly journals Interfacial Electron Transfer in Dye-Sensitized TiO2 Devices for Solar Energy Conversion

2021 ◽  
Author(s):  
Andressa Müller ◽  
Wendel Wierzba ◽  
Mariana Pastorelli ◽  
André Polo
Keyword(s):  
Electron Transfer ◽  
Solar Energy ◽  
Energy Conversion ◽  
Solar Energy Conversion ◽  
Transport Processes ◽  
Transfer Reactions ◽  
Molecular Devices ◽  
Interfacial Electron Transfer ◽  
Electron Transfer Reactions ◽  
Dye Sensitized

The development of cost-effective molecular devices that efficiently capture and convert sunlight into other useful forms of energy is a promising approach to meet the world’s increasing energy demands. These devices are designed through a successful combination of materials and molecules that work synergistically to promote light-driven chemical reactions. Light absorption by a surface-bound chromophore triggers a sequence of interfacial electron transfer processes. The efficiencies of the devices are governed by the dynamic balance between the electron transfer reactions that promote energy conversion and undesirable side reactions. Therefore, it is necessary to understand and control these processes to optimize the design of the components of the devices and to achieve higher energy conversion efficiencies. In this context, this review discusses general aspects of interfacial electron transfer reactions in dye-sensitized TiO2 molecular devices for solar energy conversion. A theoretical background on the Marcus-Gerischer theory for interfacial electron transfer and theoretical models for electron transport within TiO2 films are provided. An overview of dye-sensitized solar cells (DSSCs) and dye-sensitized photoelectrosynthesis cells (DSPECs) is presented, and the electron transfer and transport processes that occur in both classes of devices are emphasized and detailed. Finally, the main spectroscopic, electrochemical and photoelectrochemical experimental techniques that are employed to elucidate the kinetics of the electron transfer reactions discussed in this review are presented.

scholarly journals Theoretical Analysis on Heteroleptic Cu(I)-Based Complexes for Dye-Sensitized Solar Cells: Effect of Anchors on Electronic Structure, Spectrum, Excitation, and Intramolecular and Interfacial Electron Transfer

Molecules ◽  
2020 ◽  
Vol 25 (16) ◽  
pp. 3681
Author(s):  
Zhijie Xu ◽  
Xiaoqing Lu ◽  
Yuanyuan Li ◽  
Shuxian Wei
Keyword(s):  
Electron Transfer ◽  
Electronic Structure ◽  
Solar Cells ◽  
Molecular Orbital ◽  
Dye Sensitized Solar Cells ◽  
Orbital Energy ◽  
Interfacial Electron Transfer ◽  
Dye Sensitized ◽  
Cyanoacrylic Acid ◽  
Sensitized Solar Cells

Two groups of heteroleptic Cu(I)-based dyes were designed and theoretically investigated by density functional theory (DFT) and time-dependent DFT (TD-DFT) methods. Different anchors were integrated into the dye skeleton to shed light on how the type of anchor influenced the electronic structure, absorption spectrum, electron excitation, and intramolecular and interfacial electron transfer of dyes. The results indicated that, compared with other dyes, the dyes with cyanoacrylic acid and nitric acid exhibited more appropriate electron distributions in frontier molecular orbitals (FMOs), lower HOMO (the highest occupied molecular orbital) –LUMO (the lowest unoccupied molecular orbital) energy gaps, broader absorption spectral ranges as well as improved spectral characteristics in the near-infrared region and better intramolecular electron transfer (IET) characteristics with more electrons transferred to longer distances, but smaller orbital overlap. Among all the studied Cu(I)-based dyes, B1 and P1 (with cyanoacrylic acid anchoring group) exhibited the best interface electronic structure parameters with a relatively short electron injection time (τinj) and large dipole moment (μnormal), which would have a positive effect on the open-circuit photovoltage (Voc) and short-circuit current density (Jsc), resulting in high power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs). Our findings are expected to provide a new insight into the designing and screening of high-performance dyes for DSSCs.

Femtosecond insights into direct electron injection in dye anchored ZnO QDs following charge transfer excitation

2016 ◽  
Vol 18 (30) ◽  
pp. 20672-20681 ◽  
Author(s):  
Pushpendra Kumar ◽  
Sunil Kumar ◽  
Subrata Ghosh ◽  
Suman Kalyan Pal
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Charge Transfer ◽  
Electron Injection ◽  
Interfacial Electron Transfer ◽  
Dye Sensitized ◽  
Charge Transfer Excitation ◽  
Zno Qds

The role of the charge transfer (CT) state in interfacial electron transfer in dye-sensitized quantum dots (QDs) has been addressed.

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