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Insights into the Control of Optoelectronic Properties in Mixed-Stacking Charge-Transfer Complexes
Authors:Dr. Zongrui Wang  Dr. Fei Yu  Dr. Jian Xie  Prof. Jianfeng Zhao  Ye Zou  Zepeng Wang  Prof. Qichun Zhang
Affiliation:1. School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798 Singapore;2. Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211816 P. R. China;3. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 P. R. China
Abstract:Although cocrystallization has provided a promising platform to develop new organic optoelectronic materials, it is still a big challenge to purposely design and achieve specific optoelectronic properties. Herein, a series of mixed-stacking cocrystals (TMFA, TMCA, and TMTQ) were designed and synthesized, and the regulatory effects of the acceptors on the co-assembly behavior, charge-transfer nature, energy-level structures, and optoelectronic characteristics were systematically investigated. The results demonstrate that it is feasible to achieve effective charge-transport tuning and photoresponse switching by carefully regulating the intermolecular charge transfer and energy orbitals. The inherent mechanisms underlying the change in these optoelectronic behaviors were analyzed in depth and elucidated to provide clear guidelines for future development of new optoelectronic materials. In addition, due to the excellent photoresponsive characteristics of TMCA, TMCA-based phototransistors were investigated with varying light wavelength and optical power, and TMCA shows the best performance among all reported cocrystals under UV illumination.
Keywords:charge transfer  donor–acceptor systems  cocrystallization  stacking interactions  phototransistors
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