文献类型：期刊文献

英文题名：Photoconductance from the Bent-to-Planar Photocycle between Ground and Excited States in Single-Molecule Junctions

作者：Zou, Qi[1,2];Chen, Xuanying[1,2];Zhou, Yu[3];Jin, Xin[1,2];Zhang, Zhiyun[1,2];Qiu, Jin[1,2];Wang, Rui[1,2];Hong, Wenjing[3];Su, Jianhua[1,2];Qu, Da-Hui[1,2];Tian, He[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, Frontiers Sci Ctr Mat & Dynam Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Frontiers Sci Ctr Mat & Dynam Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[3]Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China

年份：2022

卷号：144

期号：22

起止页码：10042

外文期刊名：JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

收录：;EI(收录号：20222412227963);WOS:【SCI-EXPANDED(收录号:WOS:000810117200001)】；

基金：This work was supported by the National Natural Science Foundation of China (21788102, 22175063, 22175064, and 21790361) , the National Key R&D Program of China (2017YFA0204902) , Shanghai Municipal Sci. & Tech. Major Project (2018SHZDZX03) , the 111 Project (B16017) , Shanghai Committee of Sci. & Tech. (17520750100, 20ZR1421700) , the Shanghai Pujiang Program (20PJ1404500) , and the Program for Eastern Scholar Distinguished Professor.

语种：英文

外文关键词：Irradiation - Molecules - Resonance

摘要：Single-molecule conductance measurements for 9,14diphenyl-9,14-dihydrodibenzo[a,c]phenazine (DPAC) may offer unique insight into the bent-to-planar photocycle between the ground and excited states. Herein, we employ DPAC derivative DPAC-SMe as the molecular prototype to fabricate single-molecule junctions using the scanning tunneling microscope break junction technique and explore photoconductance dependence on the excited-state structural/ electronic changes. We find up to similar to 200% conductance enhancement of DPAC-SMe under continuous 340 nm light irradiation than that without irradiation, while photoconductance disappears in the case where structural evolution of the DPAC-SMe is halted through macrocyclization. The in situ conductance modulation as pulsed 340 nm light irradiation is monitored in the DPAC-SMe-based junctions alone, suggesting that the photoconductance of DPAC-SMe stems from photoinduced intramolecular planarization. Theoretical calculations reveal that the photoinduced structural evolution brings about a significant redistribution of the electron cloud density, which leads to the appearance of Fano resonance, resulting in enhanced conductance through the DPAC-SMe-fabricated junctions. This work provides evidence of bent-to-planar photocycleinduced conductance differences at the single-molecule level, offering a tailored approach for tuning the charge transport characteristics of organic photoelectronic devices.