日盲区紫外光探测有机半导体异质结材料研究

Solar-blind ultraviolet detection is one of the core topics in the area of the optoelectronic information technology, and has important applications in national defense and civil fields. In this proposal, we plan to apply bipolar organic semiconductor to act as active layer material for solar-blind ultraviolet detection. The bipolar organic semiconductor molecules with ultrawide band gap will be designed and synthesized through the suitable selection of electron-donating, electron-withdrawing moiety, bridge structure and substituent groups. The relationship between the chemical structure and the bandgap structure including LUMO/HOMO energy level of the bipolar molecules will be set up via adjusting the chemical structure, number of the electron-donating, electron-withdrawing moieties, together with the linker type of the bridge between them. The methods to control the aggregation structure of the organic semiconductor thin film materials will be studied and the impact of the variation of the condensed structure of the bipolar organic semiconductor film on the UV absorption properties, charge transport properties can be revealed. Proper bipolar donor/acceptor molecules will be screened to construct organic semiconductor heterojunction. The chemical and electronic structure of the donor/acceptor interface will be studied to reveal their effect on the UV photoelectrical response. The development of the structure and properties of the organic semiconductor materials with ultrawide band gap under the irradiation of the deep ultraviolet light will also be explored for the purpose of looking for new pathway to achieve selective and sensitive response to deep UV. This proposal will help to enrich and develop the theory of organic semiconductor, and provide theoretical and experimental basis to the preparation of the new materials for solar-blind ultraviolet detection.

"日盲区"紫外光选择性灵敏探测材料作为紫外光探测物质基础的主体，在国防和民用领域均有着重要的应用前景，也是材料科学和信息科学技术前沿尚未解决的难题。本研究拟从有机半导体角度，开展"日盲区"紫外探测半导体异质结材料的研究，通过超宽带隙双极性有机半导体材料的分子设计、合成与表征，掌握其化学结构对LUMO/HOMO能级的影响规律；制备双极性有机半导体给体、受体薄膜材料，并调控其聚集态结构；筛选能级结构、聚集态结构、化学结构相匹配的给体、受体材料，构筑全有机半导体异质结结构，并制作原型器件，考察"日盲区"高能量紫外光激励下，材料中激子产生、分离与输运的现象与规律，揭示给体/受体异质结结构的调控与"日盲区"紫外光电响应特性的关系；为实现"日盲区"紫外信号的选择性灵敏探测探索新的途径。该项研究将有助于丰富和发展有机半导体理论内容，为设计制备具有核心知识产权的紫外探测新材料体系提供理论和实验基础。

"日盲区"紫外光探测材料作为紫外光探测物质基础的主体，在国民经济的诸多领域有着重要的应用前景，也是材料科学和信息科学前沿尚未解决的难题。本研究拟从有机半导体角度，开展“日盲区”紫外探测半导体异质结材料的研究，通过超宽带隙双极性有机半导体材料的分子设计、合成与表征，掌握其化学结构对LUMO/HOMO能级的影响规律；制备双极性有机半导体给体、受体薄膜材料，并调控其聚集态结构；筛选能级结构、聚集态结构、化学结构相匹配的给体、受体材料，构筑全有机半导体异质结结构，并制作原型器件，考察“日盲区”高能量紫外光激励下，材料中激子产生、分离与输运的现象与规律，揭示给体/受体异质结结构的调控与“日盲区”紫外光电响应特性的关系；为实现“日盲区”紫外信号的选择性灵敏探测探索新的途径。该项研究将有助于丰富和发展有机半导体理论内容，为设计制备具有核心知识产权的紫外探测新材料体系提供理论和实验基础。