Band Formation from Coupled Quantum Dots Formed by a Nanoporous Network on a Copper Surface

Abstract

Coupled Copper Surface States Periodic arrays of quantum dots can create new electronic states that arise from coupling of the states created by confinement. Lobo-Checa et al. (p. 300 ) show that the electronic surface-state of copper can be converted into a regular array of quantum dots. An organic overlayer that is created on the copper surface has pores 1.6 nanometers in diameter that trap the surface states. The coupling of these trapped states is revealed in photoemission experiments, in which a shallow dispersive electronic band is formed.

Tuning two-dimensional band structure of Cu(111) surface-state electrons that interplay with artificial supramolecular architectures

“…[1][2][3][4][5][6][7][8][9][10][11] The nanostructures that scatter surface-state electrons can be built by scanning tunneling microscope (STM) manipulation of adatoms or molecules [1][2][3][4][5] or by self-assembly processes. [6][7][8][9][10][11] In recent years, the concepts of supramolecular coordination chemistry have been used to build two-dimensional systems through surface-assisted coordination assembly. 12,13 Highly ordered nanostructures consisting of metal atoms and organic molecules can form on surfaces according to well-defined metal-ligand coordination.…”

Localized intermolecular electronic coupling in two-dimensional self-assembled 3,4,9,10-perylenetetracarboxylic diimide nanoarchitectures

“…[1][2][3][4][5][6][7][8][9][10] Perylene derivatives sublimated under vacuum have the ability to self-assemble on at metal surfaces and to form two-dimensional hydrogen-bonded nanoarchitectures. [11][12][13][14][15][16][17] These molecules can also form multicomponent organic structures when mixed with complementary building blocks. [18][19][20][21][22] Perylene derivatives are thus very attractive to fabricate new devices as new organic at-heterojunction solar cells for example.…”

Patterns of Organics on Substrates with Metallic Surface States: Why?, So??

“…Some examples on Cu(111) in- clude NC-Ph5-CN, 3deh-DPDI, and dehydro-DPDI [26][27][28][29]; Br-DNT on Ag(111) is another [30]. In all these cases, there is a single molecule on edge of the hexagonal pores.…”

“…Lobo-Checo et al [26] observed a large regular honeycomb of DPDI on Cu(111). With scanning tunneling spectroscopy (STS) they found a new peak 0.22 eV below threshold characteristic of a confined dot state.…”

“…Furthermore, the richness of the lateral interactions and geometries have long enticed engineer self-assembled patterns [1]. * This paper was presented at the 8th International Symposium on Surface Science, Tsukuba International Congress Center, Tsukuba, Japan, October [22][23][24][25][26]2017. † Corresponding author: einstein@umd.edu…”