CAREER: Tracking Charge and Energy Transfer at Buried Organic Interfaces

职业：跟踪埋藏有机界面的电荷和能量转移

• 批准号: 1654404
• 负责人: Sean Roberts
• 金额: $ 55万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-03-15 至 2023-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1654404&HistoricalAwards=false
• 关键词: CAREER; Tracking; Charge; Energy; Transfer

In this project supported by the Chemical Structure, Dynamics and Mechanisms-A Program, Professor Sean Roberts and his students at the University of Texas at Austin are developing new laser-based optical tools which enable the study of electric charge transfer processes occurring at the interfaces of films composed of semiconducting organic molecules. The research advances our knowledge about the properties of electrically conductive molecules, and may also advance the application of this class of molecules in solar energy technology. The project provides a vehicle for the training of graduate and undergraduate students in chemistry, optical physics, and materials science. A significant part of the undergraduates' involvement occurs through a collaboration with Austin Community College.The primary goal of this project is to establish the structure-function relationships that guide interfacial charge and energy transfer at two model organic semiconducting (OSC) interfaces: (1) squaraine dye:fullerene heterojunctions used to separate charge in organic photovoltaics, and (2) silicon and Indium-Gallium-Arsenic (InGaAs) surfaces that have been sensitized with singlet fission-capable acene molecules. To measure the electronic structure and dynamics of these interfaces, the Roberts groups is employing steady-state and time-resolved measurements based on an interface-specific technique, Electronic Sum Frequency Generation (ESFG). ESFG allows for selective viewing of energy and electron transfer at OSC interfaces. By using these spectroscopic methods in conjunction with conventional thin film characterization tools and material processing methods that can alter molecular packing at heterojunctions, the project allows the research group to establish structure-function relationships that can improve the efficiency of energy transfer and charge separation at buried OSC interfaces and potentially advances photovoltaic technologies.

在该项目的支持下，在德克萨斯大学奥斯汀分校的化学结构，动力学和机制计划的支持下，肖恩·罗伯茨（Sean Roberts）及其学生正在开发基于激光的新光学工具，该工具能够研究由半导体有机分子组成的膜的电荷传输过程。该研究促进了我们对导电分子的特性的了解，还可以推进该类别在太阳能技术中的应用。该项目为培训化学，光学物理和材料科学的研究生和本科生提供了一种工具。本科生参与的很大一部分是通过与奥斯汀社区学院的合作发生的。该项目的主要目标是在两个模型有机半导体（OSC）界面（OSC）界面建立结构功能关系，以指导界面的电荷和能量转移：（1）Squaraine dye：富勒烯近乎电荷构造：用单裂裂变能力的阳离子分子敏感的氨基氨基酸（INGAAS）表面。为了衡量这些接口的电子结构和动力学，罗伯茨组正在基于界面特异性技术，电子总和频率产生（ESFG）采用稳态和时间分辨测量。 ESFG允许在OSC界面上选择性观察能量和电子传输。通过使用这些光谱方法与传统的薄膜表征工具和材料处理方法结合使用，可以改变异质界面的分子填料，该项目允许研究小组建立结构功能关系，从而可以提高埋入的OSC Interfaces和潜在进步的Photovoltaic Photovoltaic Photovallaic技术的能量转移和电荷分离的效率。

项目成果

Sensitivity of sum frequency generation experimental conditions to thin film interference effects

和频发生实验条件对薄膜干涉效应的敏感性

• DOI: 10.1063/5.0039897
• 发表时间: 2021
• 期刊: The Journal of Chemical Physics
• 作者: Cotton, Daniel E.;Roberts, Sean T.
• 通讯作者: Roberts, Sean T.

Using Electronic Sum-Frequency Generation to Analyze the Interfacial Structure of Singlet Fission-Capable Perylenediimide Thin Films

• DOI: 10.1021/acs.jpcc.0c01025
• 发表时间: 2020-05-28
• 期刊: JOURNAL OF PHYSICAL CHEMISTRY C
• 影响因子: 3.7
• 作者: Cotton, Daniel E.;Moon, Aaron P.;Roberts, Sean T.
• 通讯作者: Roberts, Sean T.

Singlet Fission Involves an Interplay between Energetic Driving Force and Electronic Coupling in Perylenediimide Films

• DOI: 10.1021/jacs.7b11888
• 发表时间: 2018-01-17
• 期刊: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
• 影响因子: 15
• 作者: Le, Aaron K.;Bender, Jon A.;Roberts, Sean T.
• 通讯作者: Roberts, Sean T.

Moisture-Driven Formation and Growth of Quasi-2-D Organolead Halide Perovskite Crystallites

• DOI: 10.1021/acsaem.0c00423
• 发表时间: 2020-06
• 作者: Bryan R. Wygant;Geoffrey T Geberth;Alexandre Z. Ye;A. Dolocan;Daniel E. Cotton;S. Roberts;D. V. Vanden Bout;C. Mullins

Using Heterodyne-Detected Electronic Sum Frequency Generation To Probe the Electronic Structure of Buried Interfaces

利用外差检测电子和频产生来探测埋入界面的电子结构

• DOI: 10.1021/acs.jpcc.7b05514
• 发表时间: 2017
• 期刊: The Journal of Physical Chemistry C
• 作者: Moon, Aaron P.;Pandey, Ravindra;Bender, Jon A.;Cotton, Daniel E.;Renard, Benny A.;Roberts, Sean T.
• 通讯作者: Roberts, Sean T.