112學年材料所-第三週 專題研討課程演講B區公告 (112年9月21日)
2023.09.15
112學年上學期 材料所專題研討課程 B區公告
題目：
當前分子電子學面臨的挑戰：分子開關和電荷轉移動力學
Current challenges in molecular electronics: molecular switches and charge transfer dynamics
主講人：Michael Zharnikov Dr.
現職：德國海德堡大學 應用物理化學研究所 研究教授
學歷：德國柏林大學 應用物理化學博士
時間：112年 09月 21日(四) 下午 3:10 – 5 :00
地點：成功大學成功校區 材料新館1F 協勝發講堂教室44101
演講摘要：
Molecular electronics (ME) represents a new, potentially important concept in nanofabrication. The simplest functional unit within the ME framework is a molecular switch. In this context, the switching ability of supported 2D-arrays of potential molecular switches - conjugated rod-like aromatic compounds containing the isomerization-capable azobenzene unit - was studied in detail. The system exhibits exceptionally good switching behaviour relying on the collective and correlated isomerization response of the adsorbed molecules to the external stimuli - UV or visible light. In addition, these compounds represent a prototype of molecular cargo lifters, powered by light. The second important issue within the ME concept is the charge transfer (CT) through individual molecular units (or loosely “molecular wires”) serving as basic building blocks of potential devices. In this context, femtosecond CT dynamics in several prototype "wires" assembled in monomolecular fashion on metal substrates was addressed by resonant Auger electron spectroscopy using the core hole clock approach. The CT pathway was unambiguously defined by resonant excitation of a special marker group attached to the molecular backbone. The characteristic CT time through molecular frameworks was found to depend strongly on the character of the molecular orbital which mediates the CT process. The individual orbitals could be addressed by either the energy or symmetry selection. The CT direction could be controlled by the identity of the marker group. The efficiency of different molecular anchors was compared.
歡迎各位撥冗參加!!
題目：
當前分子電子學面臨的挑戰：分子開關和電荷轉移動力學
Current challenges in molecular electronics: molecular switches and charge transfer dynamics
主講人：Michael Zharnikov Dr.
現職：德國海德堡大學 應用物理化學研究所 研究教授
學歷：德國柏林大學 應用物理化學博士
時間：112年 09月 21日(四) 下午 3:10 – 5 :00
地點：成功大學成功校區 材料新館1F 協勝發講堂教室44101
演講摘要：
Molecular electronics (ME) represents a new, potentially important concept in nanofabrication. The simplest functional unit within the ME framework is a molecular switch. In this context, the switching ability of supported 2D-arrays of potential molecular switches - conjugated rod-like aromatic compounds containing the isomerization-capable azobenzene unit - was studied in detail. The system exhibits exceptionally good switching behaviour relying on the collective and correlated isomerization response of the adsorbed molecules to the external stimuli - UV or visible light. In addition, these compounds represent a prototype of molecular cargo lifters, powered by light. The second important issue within the ME concept is the charge transfer (CT) through individual molecular units (or loosely “molecular wires”) serving as basic building blocks of potential devices. In this context, femtosecond CT dynamics in several prototype "wires" assembled in monomolecular fashion on metal substrates was addressed by resonant Auger electron spectroscopy using the core hole clock approach. The CT pathway was unambiguously defined by resonant excitation of a special marker group attached to the molecular backbone. The characteristic CT time through molecular frameworks was found to depend strongly on the character of the molecular orbital which mediates the CT process. The individual orbitals could be addressed by either the energy or symmetry selection. The CT direction could be controlled by the identity of the marker group. The efficiency of different molecular anchors was compared.
歡迎各位撥冗參加!!