Morphology of the Metal-organic Semiconductor Contacts: the Role of Substrate Surface Treatment

AbstractWe have used atomic force microscopy (AFM) to study the effect of common substrate surface treatments for the metal-organic chemical vapor deposition (MOCVD) of GaN on sapphire. It appears that contaminants play a major role in the surface chemistry and strongly influence the morphology of the treated surfaces. In order to investigate the role of these contaminants, we have introduced the concept of “controlled contamination” (CC), namely, exposure of the sapphire surfaces to controlled amounts of potential contaminants in-situ and investigation of the resulting sapphire morphology. The results showed that sapphire, considered to be a very stable oxide surface, is clearly reactive in the GaN MOCVD chemical environment at the high temperatures (HT) employed, allowing us to use CC for obtaining sapphire substrates with controlled roughness. Nevertheless, epitaxial growth using the two-step GaN MOCVD process appears to be very robust and practically insensitive to the (submicronscale) substrate morphology.

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Reversible switching of charge injection barriers at metal/organic-semiconductor contacts modified with structurally disordered molecular monolayers

Applied Physics Letters ◽

10.1063/1.4861164 ◽

2014 ◽

Vol 104 (1) ◽

pp. 013308 ◽

Cited By ~ 12

Author(s):

Ryo Nouchi ◽

Masanori Shigeno ◽

Nao Yamada ◽

Tomoaki Nishino ◽

Katsumi Tanigaki ◽

...

Keyword(s):

Organic Semiconductor ◽

Charge Injection ◽

Molecular Monolayers ◽

Metal Organic ◽

Semiconductor Contacts

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Classification and role of modulators on crystal engineering of metal organic frameworks (MOFs)

Coordination Chemistry Reviews ◽

10.1016/j.ccr.2021.214064 ◽

2021 ◽

Vol 444 ◽

pp. 214064

Author(s):

Danni Jiang ◽

Chao Huang ◽

Jian Zhu ◽

Ping Wang ◽

Zhiming Liu ◽

...

Keyword(s):

Crystal Engineering ◽

Metal Organic Frameworks ◽

Metal Organic

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The critical role of the coordination sphere in the high-efficiency blue-light emission from aminopyrazine metal-organic polymers

Dyes and Pigments ◽

10.1016/j.dyepig.2020.109025 ◽

2021 ◽

Vol 186 ◽

pp. 109025

Author(s):

João Humberto Dias Campos ◽

Meiry Edivirges Alvarenga ◽

Maykon Alves Lemes ◽

José Antônio do Nascimento Neto ◽

Freddy Fernandes Guimarães ◽

...

Keyword(s):

Blue Light ◽

Coordination Sphere ◽

High Efficiency ◽

Light Emission ◽

Critical Role ◽

Organic Polymers ◽

Blue Light Emission ◽

Metal Organic

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Porphyrin and phthalocyanine-based Metal Organic Frameworks beyond metal-carboxylates

Dalton Transactions ◽

10.1039/d0dt03903a ◽

2020 ◽

Author(s):

Siddhartha De ◽

Thomas Devic ◽

Alexandra Fateeva

Keyword(s):

Porous Materials ◽

Metal Organic Frameworks ◽

Metal Carboxylates ◽

Natural Systems ◽

Metal Organic

Given the ubiquitous role of porphyrins in natural systems, these molecules and related derivatives such as phthalocyanines are fascinating building units to achieve functional porous materials. Porphyrin-based MOFs have been...

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