Long-range-ordered CdTe∕GaAs nanodot arrays grown as replicas of nanoporous alumina masks

Abstract

Long-range-ordered CdTe nanodot arrays with controlled size and density were grown on GaAs substrates by using molecular-beam epitaxy with ultrathin nanoporous alumina masks. The CdTe∕GaAs nanodot arrays were grown as replicas of the self-assembled porous alumina masks in spite of the large lattice mismatch between GaAs and CdTe. Using ultrathin alumina masks (ca. 200nm in thickness), we fabricated CdTe nanodot arrays with uniform dot sizes in the ranges of 35nm (with a density of ∼2.5×1010cm−2) and 80nm (with a density of ∼8.1×109cm−2). This is the report on controlling both the size and the density of II-VI/III–V heterostructure semiconductor nanodots.

Distinction of heterogeneity on Au nanostructured surface based on phase contrast imaging of atomic force microscopy

“…1(d). Actually, the thickness of AAO formed by second anodization for 5 min was about 250 nm [11]. The cross-section of TMAFM phase image of AAO is shown in Fig.…”

“…Anodic aluminum oxide (AAO) has widely been used as a template or an evaporation mask for the growth of nanostructured materials such as nanodot arrays, nanotubes, and nanowires [8][9][10][11][12][13][14]. Actually, nanostructured materials have many applications in biotechnology [14][15][16].…”

Long-range-ordered Ag nanodot arrays grown on GaAs substrate using nanoporous alumina mask

“…However, the reports about PAAMs used on GaAs substrates are very few especially for fabricating PAA directly on GaAs substrates [20][21][22]. Almost all of the reports about using PAAMs to fabricate nanodots on GaAs substrates are fulfilled by binding the PAAMs on the GaAs substrates [23][24][25]. One big problem of this process is the poor adhesion between the PAA mask and the substrate.…”

Plasmonic properties of metal nanodot arrays with same diameter utilizing nanoporous alumina mask

“…The structure of porous alumina layer is close-packed hexagonal columnar cell array containing a central pore normal to the aluminum substrate. The nanoporous alumina layer with uniform channels of nanometer dimensions has been widely used as a mask to fabricate many kinds of nanostructures including nanoholes or nanodots [5][6][7][8][9]. In particular, various nanodot arrays were fabricated using the nanoporous alumina mask as an evaporation mask [6][7][8].…”