Journal ArticleDOI
Cobalt Redox Mediators for Ruthenium-Based Dye-Sensitized Solar Cells: A Combined Impedance Spectroscopy and Near-IR Transmittance Study
TLDR
In this article, the difference in performance between dye-sensitized solar cells using Z907 and another benchmark sensitizer cis-diisothiocyanato-bis (2,2′-bipyridyl-4,4′-dicarboxylic acid) ruthenium(II) bis(tetrabutylammonium) (N719) was investigated.Abstract:
Dye-sensitized solar cells with power conversion efficiencies of up to 6.5% have been fabricated using a cobalt tris-bipyridyl redox mediator with the cis-diisothiocyanato-(2,2′-bipyridyl-4,4′-dicarboxylic acid)-(2,2′-bipyridyl-4,4′-dinonyl) ruthenium(II) (Z907) sensitizer. This represents a significant improvement in efficiency compared with previous reports using ruthenium sensitizers. In situ near-IR transmittance measurements in conjunction with electrochemical impedance spectroscopy have been used to explain the difference in performance between DSCs using Z907 and another benchmark sensitizer cis-diisothiocyanato-bis(2,2′-bipyridyl-4,4′-dicarboxylic acid) ruthenium(II) bis(tetrabutylammonium) (N719). It is found that the small-perturbation electron diffusion length (Ln) is significantly longer in Z907 cells compared with that in N719 cells, which can explain most of the difference in performance. It is also shown that the longer Ln in Z907 cells is caused by inhibited recombination, as opposed to fa...read more
Citations
More filters
Journal ArticleDOI
Arylamine organic dyes for dye-sensitized solar cells
Mao Liang,Mao Liang,Jun Chen +2 more
TL;DR: The cell performance of the arieslamine organic dyes are compared, providing a comprehensive overview of arylamineorganic dyes, demonstrating the advantages/disadvantages of each class, and pointing out the field that needs to reinforce the research direction in the further application of DSCs.
Journal ArticleDOI
A perspective on the production of dye-sensitized solar modules
Azhar Fakharuddin,Rajan Jose,Thomas M. Brown,Francisco Fabregat-Santiago,Juan Bisquert,Juan Bisquert +5 more
TL;DR: In this article, the main factors behind their inferior photovoltaic performance and identify possible opportunities for the design of more efficient dye-sensitized solar cells (DSCs) modules.
Journal ArticleDOI
Recent developments in redox electrolytes for dye-sensitized solar cells
TL;DR: In this article, advances in the conception and performance of various redox shuttles including molecular hole transport materials are reviewed with respect to their structure and the charge transfer dynamics at the counter electrode.
Journal ArticleDOI
Porphyrins in bio-inspired transformations: Light-harvesting to solar cell
TL;DR: In this paper, a review of the recent studies on porphyrin-based bio-inspired materials for solar energy utilization is presented, where the authors highlight mostly the recent work of porphrin-based materials for photovoltaic applications.
Journal ArticleDOI
Cobalt electrolyte/dye interactions in dye-sensitized solar cells: a combined computational and experimental study.
Edoardo Mosconi,Jun-Ho Yum,Florian Kessler,Carlos J. Gómez García,Cristiano Zuccaccia,Antonio Cinti,Mohammad Khaja Nazeeruddin,Michael Grätzel,Filippo De Angelis +8 more
TL;DR: An experimental and computational investigation to understand the nature of the interactions between cobalt redox mediators and TiO(2) surfaces sensitized by ruthenium and organic dyes, and their impact on the performance of the corresponding dye-sensitized solar cells (DSSCs).
References
More filters
Journal ArticleDOI
A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films
TL;DR: In this article, the authors describe a photovoltaic cell, created from low-to medium-purity materials through low-cost processes, which exhibits a commercially realistic energy-conversion efficiency.
Journal ArticleDOI
Recent advances in sensitized mesoscopic solar cells.
TL;DR: The discussion focuses on mesoscopic solar cells, in particular, dye-sensitized solar cells (DSCs), which have been developed in the laboratory and remain the focus of the investigations, and aims at identifying and providing solutions to the efficiency problems that the OPV field is still facing.
Journal ArticleDOI
Characteristics of the Iodide/Triiodide Redox Mediator in Dye-Sensitized Solar Cells
Gerrit Boschloo,Anders Hagfeldt +1 more
TL;DR: The iodide/triiodide redox couple has good solubility, does not absorb too much light, has a suitable redox potential, and provides rapid dye regeneration, and it is expected that overall efficiencies above 15% might be achieved if half of this internal potential loss could be gained.
Journal ArticleDOI
Theory of the Impedance of Electron Diffusion and Recombination in a Thin Layer
TL;DR: In this paper, the small signal ac impedance of electron diffusion and recombination in a spatially restricted situation with application in systems such as porous TiO2 nanostructured photoelectrodes and intrinsically conducting polymers is analyzed.
Journal ArticleDOI
Design of Organic Dyes and Cobalt Polypyridine Redox Mediators for High-Efficiency Dye-Sensitized Solar Cells
Sandra M. Feldt,Elizabeth A. Gibson,Erik Gabrielsson,Licheng Sun,Gerrit Boschloo,Anders Hagfeldt +5 more
TL;DR: Dye-sensitized solar cells with cobalt-based mediators with efficiencies surpassing the record for DSCs with iodide-free electrolytes were developed by selecting a suitable combination of a cobalt polypyridine complex and an organic sensitizer.