Journal ArticleDOI
Hexylthiophene-Functionalized Carbazole Dyes for Efficient Molecular Photovoltaics: Tuning of Solar-Cell Performance by Structural Modification
Zhong-Sheng Wang,Nagatoshi Koumura,Yan Cui,Masabumi Takahashi,Hiroki Sekiguchi,Atsunori Mori,Toshitaka Kubo,Akihiro Furube,Kohjiro Hara +8 more
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TLDR
In this paper, the photovoltaic performance of dye-sensitized solar cells (DSSCs) was improved by adding n-hexyl chains to the thiophene groups.Abstract:
Novel organic dyes (MK dyes), which have a carbazole derivative as an electron donor and a cyanoacrylic acid moiety (═C(—C≡N)COOH) as an electron acceptor and an anchoring group, connected with n-hexyl-substituted oligothiophenes as a π-conjugated system, were designed and synthesized for application in dye-sensitized solar cells (DSSCs), which are one of the promising molecular photovoltaics. The photovoltaic performance of the DSSCs based on MK dyes markedly depends on the molecular structure of the dyes in terms of the number and position of n-hexyl chains and the number of thiophene moieties. Retardation of charge recombination caused by the existence of n-hexyl chains linked to the thiophene groups resulted in an increase in electron lifetime. As a consequence, an improvement of open-circuit photovoltage (Voc) and hence the solar-to-electric power conversion efficiency (η) of DSSCs was achieved upon addition of n-hexyl chains to the thiophene groups. In addition, the adsorption condition (amount of d...read more
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Journal ArticleDOI
Synthesis of a novel heptamethine–cyanine dye for use in near-infrared active dye-sensitized solar cells with porous zinc oxide prepared at low temperature
Kazumasa Funabiki,Hiroyoshi Mase,Atsuhiko Hibino,Nagisa Tanaka,Noriko Mizuhata,Yukako Sakuragi,Akihiko Nakashima,Tsukasa Yoshida,Yasuhiro Kubota,Masaki Matsui +9 more
TL;DR: In this paper, a novel near-infrared absorbing heptamethine-cyanine dye (KFH-3) was synthesized for use in highly efficient dye-sensitized solar cells with porous zinc oxide (ZnO) prepared at low temperature.
Journal ArticleDOI
Anchoring stability and photovoltaic properties of new D(-π-A)2 dyes for dye-sensitized solar cell applications
Roberto Grisorio,Luisa De Marco,Giovanni Allegretta,Roberto Giannuzzi,Gian Paolo Suranna,Michele Manca,Piero Mastrorilli,Giuseppe Gigli,Giuseppe Gigli +8 more
TL;DR: In this paper, two new di-anchoring dyes for applications in dye-sensitized solar cells were designed with a branched D(-π-A) 2 structure containing a rigid alkyl-functionalized carbazole core as the donor part, one (Dye1 ) or two (DYE2 ) thiophene units as the π-bridge and a cyano-acrylic moiety as acceptor and anchoring part.
Journal ArticleDOI
Stepwise Construction of Head-to-Tail-Type Oligothiophenes via Iterative Palladium-Catalyzed CH Arylation and Halogen Exchange
Naoyuki Masuda,Shunsuke Tanba,Atsushi Sugie,Daiki Monguchi,Nagatoshi Koumura,Kohjiro Hara,Atsunori Mori +6 more
TL;DR: The well-defined head-to-tail oligothiophenes were synthesized via palladium-catalyzed CH arylation and halogen exchange sequentially through the 2-halothiophene derivatives.
Journal ArticleDOI
Triarylamine-substituted imidazole- and quinoxaline-fused push-pull porphyrins for dye-sensitized solar cells.
Hironobu Hayashi,Abeda Sultana Touchy,Yuriko Kinjo,Kei Kurotobi,Yuuki Toude,Seigo Ito,Hanna Saarenpää,Nikolai V. Tkachenko,Helge Lemmetyinen,Hiroshi Imahori +9 more
TL;DR: Fundamental information provides a new tool for the rational molecular design of highly efficient dye-sensitized solar cells based on push-pull porphyrins, leading to an overall improved cell performance of ZnPQI.
Journal ArticleDOI
Organic dyes containing oligo-phenothiazine for dye-sensitized solar cells
Yuan Jay Chang,Po Ting Chou,Yan Zuo Lin,Motonori Watanabe,Chih Jen Yang,Tsung Mei Chin,Tahsin J. Chow,Tahsin J. Chow +7 more
TL;DR: A series of organic dyes containing oligo-phenothiazine were synthesized and used effectively on the fabrication of dye-sensitized solar cells (DSSCs) as mentioned in this paper.
References
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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.
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Light-Induced Redox Reactions in Nanocrystalline Systems
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Journal ArticleDOI
Solvatochromic Dyes as Solvent Polarity Indicators
TL;DR: In this paper, a review compiles positively and negatively solvatochromic compounds which have been used to establish empirical scales of solvent polarity by means of UV/vis/near-IR spectroscopic measurements in solution.
Journal ArticleDOI
Combined Experimental and DFT-TDDFT Computational Study of Photoelectrochemical Cell Ruthenium Sensitizers
Mohammad Khaja Nazeeruddin,Filippo De Angelis,Simona Fantacci,Annabella Selloni,Guido Viscardi,Paul Liska,Seigo Ito,Bessho Takeru,Michael Grätzel +8 more
TL;DR: The computed alignments of the molecular orbitals of the different complexes with the band edges of a model TiO(2) nanoparticle provide additional insights into the electronic factors governing the efficiency of dye-sensitized solar cell devices.