1. Tuning the photocurrent responsive and resistive switching performances of stilbazolium/iodoargentate hybrids by modulating the aggregation mode among chromophores.
- Author
-
Chen, Jing-Jing, Huang, Chang-Qi, Yi, Hong-Mei, Lv, Zhou-Lin, Wu, Wei, Zheng, Hui-Dong, and Li, Hao-Hong
- Subjects
CHROMOPHORES ,STACKING interactions ,COMPUTER storage devices ,PHOTOCATHODES - Abstract
The study about the effect of the stacking mode on the photo/electrical performance of crystalline organic/inorganic hybrids will be beneficial for the design of new photo/electrically active materials. In this work, D–π–A stilbazolium-type chromophores bearing novel ortho-N-alkyl substituents were synthesized and incorporated with iodoargentates to generate three crystalline stilbazolium/iodoargentate hybrids, i.e., [(CMAMP)(Ag
2 I3 )]n (1), [(HMAMP)(Ag2 I3 )]n (2), and [(HMAHP)2 (Ag5 I7 )]n (3). When the substitutes on the amine group range from –C2 H5 CN (for CMAMP+ ) to –C2 H5 OH (for HMAMP+ ), the same (Ag2 I3 )n n− anions will be produced, and the π⋯π stacking interactions among stilbazoliums will be observed from absence to presence (weak head-to-head H-aggregation). Furthermore, when the substituent on the ortho-N of pyridine was also set as –C2 H5 OH (for HMAHP+ ), more electron-rich (Ag5 I7 )n 2n− anion can be generated, and strong head-to-tail H-aggregation among HMAHP+ cations will happen. The enhanced aggregation strengthening in 3 can lead to its larger blue-shift photoluminescence, higher photocurrent, and better resistive switching performance (much higher ON/OFF ratio of 4.51 × 102 ). Their binary resistive switching mechanism can be explained as the SCLC model, and the better photo/electrical performances of 3 stem from its stronger head-to-tail H-aggregations, more negatively charged (Ag5 I7 )n 2n− anion, and stronger (Ag5 I7 )n 2n− –HMAHP+ interaction. The highly delocalized π antibonding orbitals between the empty p-orbitals of ethylene in its LUMO of (HMAHP)2 2+ dimer of 3 also support this conclusion. The good structure–property correlation based on accurate structural information in these stilbazolium/iodoargentate hybrids will be beneficial for the design of next-generation memory devices. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF