Dynamics and Energetics of Single-Step Hole Transport in DNA Hairpins

2003 ◽  
Vol 125 (16) ◽  
pp. 4850-4861 ◽  
Author(s):  
Frederick D. Lewis ◽  
Jianqin Liu ◽  
Xiaobing Zuo ◽  
Ryan T. Hayes ◽  
Michael R. Wasielewski
Keyword(s):  
Single Step ◽  
Hole Transport ◽  
Dna Hairpins

Dynamics of Photoinduced Charge Transfer and Hole Transport in Synthetic DNA Hairpins

2001 ◽  
Vol 34 (2) ◽  
pp. 159-170 ◽  
Author(s):  
Frederick D. Lewis ◽  
Robert L. Letsinger ◽  
Michael R. Wasielewski
Keyword(s):  
Charge Transfer ◽  
Hole Transport ◽  
Photoinduced Charge Transfer ◽  
Dna Hairpins ◽  
Synthetic Dna ◽  
Photoinduced Charge

scholarly journals Intrinsic electronic conductivity of individual atomically resolved amyloid crystals reveals micrometer-long hole hopping via tyrosines

2020 ◽  
Vol 118 (2) ◽  
pp. e2014139118
Author(s):  
Catharine Shipps ◽  
H. Ray Kelly ◽  
Peter J. Dahl ◽  
Sophia M. Yi ◽  
Dennis Vu ◽  
...  
Keyword(s):  
Electronic Conductivity ◽  
Thermal Conditions ◽  
Single Step ◽  
Hole Transport ◽  
Transport Rate ◽  
Proton Acceptor ◽  
Bacteria Transport ◽  
Proton Coupled Electron Transfer ◽  
True Protein ◽  
Metal Cofactors

Proteins are commonly known to transfer electrons over distances limited to a few nanometers. However, many biological processes require electron transport over far longer distances. For example, soil and sediment bacteria transport electrons, over hundreds of micrometers to even centimeters, via putative filamentous proteins rich in aromatic residues. However, measurements of true protein conductivity have been hampered by artifacts due to large contact resistances between proteins and electrodes. Using individual amyloid protein crystals with atomic-resolution structures as a model system, we perform contact-free measurements of intrinsic electronic conductivity using a four-electrode approach. We find hole transport through micrometer-long stacked tyrosines at physiologically relevant potentials. Notably, the transport rate through tyrosines (105 s−1) is comparable to cytochromes. Our studies therefore show that amyloid proteins can efficiently transport charges, under ordinary thermal conditions, without any need for redox-active metal cofactors, large driving force, or photosensitizers to generate a high oxidation state for charge injection. By measuring conductivity as a function of molecular length, voltage, and temperature, while eliminating the dominant contribution of contact resistances, we show that a multistep hopping mechanism (composed of multiple tunneling steps), not single-step tunneling, explains the measured conductivity. Combined experimental and computational studies reveal that proton-coupled electron transfer confers conductivity; both the energetics of the proton acceptor, a neighboring glutamine, and its proximity to tyrosine influence the hole transport rate through a proton rocking mechanism. Surprisingly, conductivity increases 200-fold upon cooling due to higher availability of the proton acceptor by increased hydrogen bonding.

scholarly journals Perovskite solar cells in N-I-P structure with four slot-die-coated layers

2018 ◽  
Vol 5 (5) ◽  
pp. 172158 ◽  
Author(s):  
Daniel Burkitt ◽  
Justin Searle ◽  
Trystan Watson
Keyword(s):  
Titanium Dioxide ◽  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Single Step ◽  
Hole Transport ◽  
Large Area ◽  
Slot Die Coating ◽  
Glass Substrates ◽  
Slot Die ◽  
Conversion Efficiencies

The fabrication of perovskite solar cells in an N-I-P structure with compact titanium dioxide blocking, mesoporous titanium dioxide scaffold, single-step perovskite and hole-transport layers deposited using the slot-die coating technique is reported. Devices on fluorine-doped tin oxide-coated glass substrates with evaporated gold top contacts and four slot-die-coated layers are demonstrated, and best cells reach stabilized power conversion efficiencies of 7%. This work demonstrates the suitability of slot-die coating for the production of layers within this perovskite solar cell stack and the potential to transfer to large area and roll-to-roll manufacturing processes.

scholarly journals Acridine Based Small Molecular Hole Transport Type Materials for Phosphorescent OLED Application

Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7680
Author(s):  
Ramanaskanda Braveenth ◽  
Keunhwa Kim ◽  
Il-Ji Bae ◽  
Kanthasamy Raagulan ◽  
Bo Mi Kim ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Weight Reduction ◽  
Single Step ◽  
Hole Transport ◽  
Host Material ◽  
Hole Transporting ◽  
Hole Transporting Material ◽  
Better Than ◽  
Transport Type

Two small molecular hole-transporting type materials, namely 4-(9,9-dimethylacridin-10(9H)-yl)-N-(4-(9,9-dimethylacridin-10(9H)-yl)phenyl)-N-phenylaniline (TPA-2ACR) and 10,10′-(9-phenyl-9H-carbazole-3,6-diyl)bis(9,9-dimethyl-9,10-dihydroacridine) (PhCAR-2ACR), were designed and synthesized using a single-step Buchwald–Hartwig amination between the dimethyl acridine and triphenylamine or carbazole moieties. Both materials showed high thermal decomposition temperatures of 402 and 422 °C at 5% weight reduction for PhCAR-2ACR and TPA-2ACR, respectively. TPA-2ACR as hole-transporting material exhibited excellent current, power, and external quantum efficiencies of 55.74 cd/A, 29.28 lm/W and 21.59%, respectively. The achieved device efficiencies are much better than that of the referenced similar, 1,1-Bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC)-based device (32.53 cd/A, 18.58 lm/W and 10.6%). Moreover, phenyl carbazole-based PhCAR-2ACR showed good device characteristics when applied for host material in phosphorescent OLEDs.

scholarly journals Hole transport in DNA hairpins via base mismatches and strand crossings: Efficiency and dynamics

2016 ◽  
Vol 331 ◽  
pp. 160-164
Author(s):  
Arun K. Thazhathveetil ◽  
Michelle A. Harris ◽  
Ryan M. Young ◽  
Michael R. Wasielewski ◽  
Frederick D. Lewis
Keyword(s):  
Hole Transport ◽  
Dna Hairpins

Effect of the reflectional symmetry on the coherent hole transport across DNA hairpins

2017 ◽  
Vol 146 (11) ◽  
pp. 114105 ◽  
Author(s):  
Mehdi Zarea ◽  
Yuri Berlin ◽  
Mark A. Ratner
Keyword(s):  
Hole Transport ◽  
Dna Hairpins

scholarly journals A Solution-Processed Tetra-Alkoxylated Zinc Phthalocyanine as Hole Transporting Material for Emerging Photovoltaic Technologies

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Gloria Zanotti ◽  
Giuseppe Mattioli ◽  
Anna Maria Paoletti ◽  
Giovanna Pennesi ◽  
Daniela Caschera ◽  
...  
Keyword(s):  
Perovskite Solar Cells ◽  
Single Step ◽  
Hole Transport ◽  
Transport Layer ◽  
Zinc Phthalocyanine ◽  
Hole Transport Layer ◽  
Solution Processed ◽  
Ab Initio Simulations ◽  
Hole Transporting ◽  
Hole Transporting Material

A tetra-n-butoxy zinc phthalocyanine (n-BuO)4ZnPc has been synthesized in a single step, starting from commercial precursors, and easily purified. The molecule can be solution processed to form an effective and inexpensive hole transport layer for organic and perovskite solar cells. These appealing features are suggested by the results of a series of chemical, optical, and voltammetric characterizations of the molecule, supported by the results of ab initio simulations. Preliminary measurements of (n-BuO)4ZnPc-methylammonium lead triiodide perovskite-based devices confirm such suggestion and indicate that the interface between the photoactive layer and the hole transporting layer is characterized by hole-extracting and electron-blocking properties, potentially competitive with those of other standards de facto in the field of organic hole transport materials, like the expensive Spiro-OMeTAD.

scholarly journals Tracking Hole Transport in DNA Hairpins Using a Phenylethynylguanine Nucleobase

2017 ◽  
Vol 139 (34) ◽  
pp. 12084-12092 ◽  
Author(s):  
Kristen E. Brown ◽  
Arunoday P. N. Singh ◽  
Yi-Lin Wu ◽  
Ashutosh Kumar Mishra ◽  
Jiawang Zhou ◽  
...  
Keyword(s):  
Hole Transport ◽  
Dna Hairpins

Epitaxial growth of WO3 nanoneedles achieved using a facile flame surface treatment process engineering of hole transport and water oxidation reactivity

2018 ◽  
Vol 6 (40) ◽  
pp. 19542-19546 ◽  
Author(s):  
Xinjian Shi ◽  
Lili Cai ◽  
Il Yong Choi ◽  
Ming Ma ◽  
Kan Zhang ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Epitaxial Growth ◽  
Water Oxidation ◽  
Treatment Process ◽  
Process Engineering ◽  
Single Step ◽  
Hole Transport ◽  
Flame Surface ◽  
Oxidation Reactivity

Enhancing all the key properties of a photoanode in a single step, with further tuned oxidation pathways for yielding selective products.

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