The effect of the donor in an organic dye on the electron lifetime of dye-sensitized solar cells (DSSCs) employing a cobalt redox electrolyte was investigated. We synthesized organic dyes with donor moieties of carbazole, coumarin, triphenylamine, and N-phenyl-carbazole and measured the current-voltage characteristics and electron lifetimes of the DSSCs with these dyes. The cell with the triphenylamine donor dye produced the highest open circuit voltage and longest electron lifetime. On the other hand, the lowest open circuit voltage and shortest electron lifetime was obtained with coumarin donor dye, suggesting that the coumarin attracted the cobalt redox couples to the surface of the TiO2 layer, thus increasing the concentration of cobalt complex. On the other hand, the longest electron lifetime with triphenylamine was attributed to the blocking effect by steric hindrance of the nonplanar structure of the donor.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/la4047808 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Enhancing the Optically Detected Magnetic Resonance Signal of Organic Molecular Qubits.
ACS Cent Sci
January 2025
Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States.
In quantum information science and sensing, electron spins are often purified into a specific polarization through an optical-spin interface, a process known as optically detected magnetic resonance (ODMR). Diamond-NV centers and transition metals are both excellent platforms for these so-called color centers, while metal-free molecular analogues are also gaining popularity for their extended polarization lifetimes, milder environmental impacts, and reduced costs. In our earlier attempt at designing such organic high-spin π-diradicals, we proposed to spin-polarize by shelving triplet = ±1 populations as singlets.
View Article and Find Full Text PDFAchieving Near Infrared Photodegradation by the Synergistic Effect of Z-Scheme Heterojunction and Antenna of Rare Earth Single Atoms.
Small
January 2025
Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, P. R. China.
Near-infrared light response catalysts have received great attention in renewable solar energy conversion, energy production, and environmental purification. Here, near-infrared photodegradation is successfully achieved in rare earth single atom anchored NaYF@g-CN heterojunctions by the synergistic effect of Z-scheme heterojunction and antenna of rare earth single atoms. The UV-vis light emitted by Tm can not only be directly absorbed by g-CN to generate electron-hole pairs, realizing efficient energy transfer, but also be absorbed by NaYF substrate, and generating photo-generated electrons at its impurity level, transferring the active charge to the valence band of g-CN, forming a Z-scheme heterojunction and further improving the photocatalytic efficiency.
View Article and Find Full Text PDFGenerating Beta Zeolite Nanosheets of Intergrown Polymorph B and C Using Polycationic Structure-Directing Agent.
Small
January 2025
State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
Zeolitic nanosheets possess great potential in catalysis due to their enhanced transport property and accessibility toward bulky molecules compared to conventional micron- meter scale crystals. However, the generation of Beta zeolite nanosheets, which are crucial for industrial catalysis, is still challenging for its intergrowth nature. In this work, aluminosilicate Beta nanosheets of ca.
View Article and Find Full Text PDFEnhanced Photocatalytic Degradation of Chlorsulfuron by MoS/MIL101(Fe) S-Scheme Heterojunction: A Conversion Mechanism Dominated by Electrons and Long-Lifetime Reactive Species.
Small
January 2025
Key Lab of Marin Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao, 266100, P. R. China.
Altering the generation route of reactive species is a potent means to augment the photocatalytic activity. In this study, MoS/MIL-101(Fe) S-scheme heterojunction (MF2) is prepared using a water/solvent thermal method for photocatalytic degradation of chlorsulfuron. Driven by the internal electric field, the local electron density of MF2 is redistributed, thus enhancing the adsorption of O.
View Article and Find Full Text PDFPreferential Binding of a Long-Arm Porphyrin Ligand to Higher Order G-Quadruplex under Crowding Conditions.
J Phys Chem B
January 2025
College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
Under conditions that are close to the real cellular environment, the human telomeric single-stranded overhang (∼200 nt) consisting of tens of TTAGGG repeats tends to form higher order structures of multiple G-quadruplex (G4) blocks. On account of the higher biological relevance of higher order G4 structures, ligand compounds binding to higher order G4 are significant for the drug design toward inhibiting telomerase activity. Here, we study the interaction between a cationic porphyrin derivative, 5,10,15,20-tetra{4-[2-(1-methyl-1-piperidinyl)propoxy]phenyl}porphyrin (T4), and a human telomeric G4-dimer (AG(TAG)) in the mimic intracellular molecularly crowded environment (PEG as a crowding agent) and K or Na solution (i.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!