Energy alignment at the molecule - Electrode interface: An electrochemical-potential/hardness view

A. Vilan

doi:10.1149/08603.0067ecst

Energy alignment at the molecule - Electrode interface: An electrochemical-potential/hardness view

A. Vilan^*

^*Corresponding author for this work

Department of Chemical and Biological Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

3 Citations (Scopus)

Abstract

Although the importance of energy-alignment at hetero-interface is undeniable, the mechanism dictating it is still debatable. Confusion is even larger for molecular monolayers, because molecules are mostly insulators with no energy-levels in the vicinity of the Fermi-level. This rules out molecular ionization as a means to establish electronic equilibrium. Still, there is a growing evidence for energy alignment between adsorbed molecules and the Fermilevel of their supporting substrate. This can be understood as an equilibrium between the Fermi level of the contact(s) and the chemical potential of the electrons in the molecule, established via polarization of the bound electrons in the immediate vicinity of the interface. The extent of this polarization relates to the notion of 'chemical hardness' and is relevant for both chemical binding and physical contact. This concept is demonstrated for several examples of molecular monolayers on Si and on Au.

Original language	English
Title of host publication	ECS Transactions
Editors	B. Magyari-Kope, G. Bersuker, K. Kobayashi, C. Hacker, J.G. Park, S. Shingubara, Y. Saito, Z. Karim, H. Shima, H. Kubota, Y.S. Obeng
Publisher	The Electrochemical Society
Pages	67-78
Number of pages	12
Edition	3
ISBN (Electronic)	9781607685395
ISBN (Print)	9781510871632
DOIs	https://doi.org/10.1149/08603.0067ecst
Publication status	Published - 2018
Event	Symposium on Nonvolatile Memories 6 and Surface Characterization and Manipulation for Electronic Applications - AiMES 2018, ECS and SMEQ Joint International Meeting - Cancun, Mexico Duration: 30 Sept 2018 → 4 Oct 2018

Publication series

Series	ECS Transactions
Number	3
Volume	86
ISSN	1938-6737

Conference

Conference	Symposium on Nonvolatile Memories 6 and Surface Characterization and Manipulation for Electronic Applications - AiMES 2018, ECS and SMEQ Joint International Meeting
Country/Territory	Mexico
City	Cancun
Period	30/9/18 → 4/10/18

Funding

This report is an outcome of years of collaborative research with David Cahen, Leeor Kronik, Omer Yaffe and Tatyana Bendikov (all from the Weizmann Inst.) as well as Antoine Kahn (Princeton), Chaim Sukenik (Bar-Ilan U.) and Han Zuilhof (Wageningen). I am deeply grateful to all.

All Science Journal Classification (ASJC) codes

General Engineering

Access to Document

10.1149/08603.0067ecst

Cite this

Vilan, A. (2018). Energy alignment at the molecule - Electrode interface: An electrochemical-potential/hardness view. In B. Magyari-Kope, G. Bersuker, K. Kobayashi, C. Hacker, J. G. Park, S. Shingubara, Y. Saito, Z. Karim, H. Shima, H. Kubota, & Y. S. Obeng (Eds.), ECS Transactions (3 ed., pp. 67-78). The Electrochemical Society. https://doi.org/10.1149/08603.0067ecst

Vilan, A. / Energy alignment at the molecule - Electrode interface : An electrochemical-potential/hardness view. ECS Transactions. editor / B. Magyari-Kope ; G. Bersuker ; K. Kobayashi ; C. Hacker ; J.G. Park ; S. Shingubara ; Y. Saito ; Z. Karim ; H. Shima ; H. Kubota ; Y.S. Obeng. 3. ed. The Electrochemical Society, 2018. pp. 67-78 (ECS Transactions; No. 3, Vol. 86).

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abstract = "Although the importance of energy-alignment at hetero-interface is undeniable, the mechanism dictating it is still debatable. Confusion is even larger for molecular monolayers, because molecules are mostly insulators with no energy-levels in the vicinity of the Fermi-level. This rules out molecular ionization as a means to establish electronic equilibrium. Still, there is a growing evidence for energy alignment between adsorbed molecules and the Fermilevel of their supporting substrate. This can be understood as an equilibrium between the Fermi level of the contact(s) and the chemical potential of the electrons in the molecule, established via polarization of the bound electrons in the immediate vicinity of the interface. The extent of this polarization relates to the notion of 'chemical hardness' and is relevant for both chemical binding and physical contact. This concept is demonstrated for several examples of molecular monolayers on Si and on Au.",

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Vilan, A 2018, Energy alignment at the molecule - Electrode interface: An electrochemical-potential/hardness view. in B Magyari-Kope, G Bersuker, K Kobayashi, C Hacker, JG Park, S Shingubara, Y Saito, Z Karim, H Shima, H Kubota & YS Obeng (eds), ECS Transactions. 3 edn, The Electrochemical Society, ECS Transactions, no. 3, vol. 86, pp. 67-78, Symposium on Nonvolatile Memories 6 and Surface Characterization and Manipulation for Electronic Applications - AiMES 2018, ECS and SMEQ Joint International Meeting, Cancun, Mexico, 30/9/18. https://doi.org/10.1149/08603.0067ecst

Energy alignment at the molecule - Electrode interface: An electrochemical-potential/hardness view. / Vilan, A.
ECS Transactions. ed. / B. Magyari-Kope; G. Bersuker; K. Kobayashi; C. Hacker; J.G. Park; S. Shingubara; Y. Saito; Z. Karim; H. Shima; H. Kubota; Y.S. Obeng. 3. ed. The Electrochemical Society, 2018. p. 67-78 (ECS Transactions; No. 3, Vol. 86).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Energy alignment at the molecule - Electrode interface

T2 - Symposium on Nonvolatile Memories 6 and Surface Characterization and Manipulation for Electronic Applications - AiMES 2018, ECS and SMEQ Joint International Meeting

AU - Vilan, A.

PY - 2018

Y1 - 2018

N2 - Although the importance of energy-alignment at hetero-interface is undeniable, the mechanism dictating it is still debatable. Confusion is even larger for molecular monolayers, because molecules are mostly insulators with no energy-levels in the vicinity of the Fermi-level. This rules out molecular ionization as a means to establish electronic equilibrium. Still, there is a growing evidence for energy alignment between adsorbed molecules and the Fermilevel of their supporting substrate. This can be understood as an equilibrium between the Fermi level of the contact(s) and the chemical potential of the electrons in the molecule, established via polarization of the bound electrons in the immediate vicinity of the interface. The extent of this polarization relates to the notion of 'chemical hardness' and is relevant for both chemical binding and physical contact. This concept is demonstrated for several examples of molecular monolayers on Si and on Au.

AB - Although the importance of energy-alignment at hetero-interface is undeniable, the mechanism dictating it is still debatable. Confusion is even larger for molecular monolayers, because molecules are mostly insulators with no energy-levels in the vicinity of the Fermi-level. This rules out molecular ionization as a means to establish electronic equilibrium. Still, there is a growing evidence for energy alignment between adsorbed molecules and the Fermilevel of their supporting substrate. This can be understood as an equilibrium between the Fermi level of the contact(s) and the chemical potential of the electrons in the molecule, established via polarization of the bound electrons in the immediate vicinity of the interface. The extent of this polarization relates to the notion of 'chemical hardness' and is relevant for both chemical binding and physical contact. This concept is demonstrated for several examples of molecular monolayers on Si and on Au.

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M3 - Conference contribution

AN - SCOPUS:85058300068

SN - 9781510871632

T3 - ECS Transactions

SP - 67

EP - 78

BT - ECS Transactions

A2 - Magyari-Kope, B.

A2 - Bersuker, G.

A2 - Kobayashi, K.

A2 - Hacker, C.

A2 - Park, J.G.

A2 - Shingubara, S.

A2 - Saito, Y.

A2 - Karim, Z.

A2 - Shima, H.

A2 - Kubota, H.

A2 - Obeng, Y.S.

PB - The Electrochemical Society

Y2 - 30 September 2018 through 4 October 2018

ER -

Vilan A. Energy alignment at the molecule - Electrode interface: An electrochemical-potential/hardness view. In Magyari-Kope B, Bersuker G, Kobayashi K, Hacker C, Park JG, Shingubara S, Saito Y, Karim Z, Shima H, Kubota H, Obeng YS, editors, ECS Transactions. 3 ed. The Electrochemical Society. 2018. p. 67-78. (ECS Transactions; No. 3, Vol. 86). doi: 10.1149/08603.0067ecst

Energy alignment at the molecule - Electrode interface: An electrochemical-potential/hardness view

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