Patterning Multilayers of Molecules via Self-Organization

Lü, Wei; Salac, David

doi:10.1103/physrevlett.94.146103

Cited by 32 publications

(22 citation statements)

References 24 publications

(23 reference statements)

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“…Surface modification is commonly used in PEC cells [31,32] as well as a variety of additional applications such as electronic devices [16][17][18][19][20][21], data storage [22], chemical sensing [23][24][25], molecular nanopatterning [26], and bioengineering [27][28][29][30]. In PEC applications, chemical attachment of organic molecules is a versatile technique used to enhance the stability of low-gap semiconductors while controlling the physiochemical properties of the surface [33].…”

Section: Introductionmentioning

confidence: 99%

Computational insights into charge transfer across functionalized semiconductor surfaces

Kearney

Rockett

Ertekin

2017

Science and Technology of Advanced Materials

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A 1.23 V electrochemical difference is required as a minimum to drive PEC water-splitting, which can only be provided by a single semiconductor with an excessively large band-gap. An alternative strategy is to use two small band-gap semiconductors placed electrically in series. One semiconductor operates as the photocathode to drive H 2 -evolution while the other operates as the photoanode to drive O 2 -evolution, as shown in Figure 1. In this case, the electrochemical potential difference required to split water is partially provided by each semiconductor. Photoelectrochemical water-splitting is a promising carbon-free fuel production method for producing H 2 and O 2 gas from liquid water. These cells are typically composed of at least one semiconductor photoelectrode which is prone to degradation and/or oxidation. Various surface modifications are known for stabilizing semiconductor photoelectrodes, yet stabilization techniques are often accompanied by a decrease in photoelectrode performance. However, the impact of surface modification on charge transport and its consequence on performance is still lacking, creating a roadblock for further improvements. In this review, we discuss how density functional theory and finite-element device simulations are reliable tools for providing insight into charge transport across modified photoelectrodes.

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Section: Introductionmentioning

confidence: 99%

Computational insights into charge transfer across functionalized semiconductor surfaces

Kearney

Rockett

Ertekin

2017

Science and Technology of Advanced Materials

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“…This system can also be a submonolayer of adsorbates on a substrate, where one phase is the adsorbate and the other phase is simply the bare substrate surface. Using magnitudes Equation (4) may also be connected to other systems where the long-range interaction is electric dipole [28,29] instead of elasticity. Examples include Langmuir films and adsorbates of dipole molecules.…”

Section: Connection To Representative Systemsmentioning

confidence: 99%

Growing large nanostructured superlattices from a continuum medium by sequential activation of self-assembly

Zhao

Lü

2011

Phys. Rev. E

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We propose a mechanism to grow a large superlattice of phase domains from a continuum homogenous binary film by sequential activation of self-assembly. Self-assembly was initiated in a small mobile region (where atoms could diffuse) to form a seed pattern, and then the mobile region was shifted gradually. This process led to a long-rang ordered superlattice regardless whether the seed was perfect or not, since the pattern quickly improved to a perfect superlattice along with the sequential activation. At bistable state the scanning velocity controlled the type of superlattice. Further exploration led to an intriguing finding which we call the self-activation of self-assembly, a domino effect where the self-assembly in a small region causes a long-range interaction that destabilizes its homogeneous neighbor and triggers the propagation of self-assembly to the entire system.

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“…A significant degree of process flexibility and control can be achieved. The approach may be applied to diverse systems, such as microphase separation of block-copolymers [9,10], spinodal decomposition of binary monolayers [11,12] and ordered pattern of organic molecules [13,14].…”

Section: Introductionmentioning

confidence: 99%

Spontaneous propagation of self-assembly in a continuous medium

Zhao

Lü

2012

Phys. Rev. E

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We report a mechanism that self-assembly propagates spontaneously in a continuum medium, enabling the delivery of local order information to distance. In a large stable system a locally self-assembled structure as a precursor destabilizes its surrounding areas through a dipole interaction. The newly formed structures inherit the same order information from the precursor and further activate the self-assembly of their neighbors. This process causes spatial extension of self-assembly and replication of the order, producing extremely long-range ordered superlattice without defects.

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Patterning Multilayers of Molecules via Self-Organization

Cited by 32 publications

References 24 publications

Computational insights into charge transfer across functionalized semiconductor surfaces

Computational insights into charge transfer across functionalized semiconductor surfaces

Growing large nanostructured superlattices from a continuum medium by sequential activation of self-assembly

Spontaneous propagation of self-assembly in a continuous medium

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