Electronic effect of terminal acceptor groups on different organic donor-acceptor small-molecule based memory devices

Area of Science:

• Organic electronics
• Materials science
• Device physics

Background:

• Organic donor-acceptor small molecules are crucial for developing advanced electronic memory devices.
• Tailoring molecular structures allows for the fine-tuning of device performance and memory characteristics.

Purpose of the Study:

• To design and synthesize novel organic donor-acceptor small molecules for sandwiched memory devices.
• To investigate the impact of varying electron acceptor groups on device switching behavior and memory performance.
• To explore the potential for tunable data storage capabilities in organic electronic devices.

Main Methods:

• Synthesis of three new organic small molecules featuring a bicarbazole electron donor and different electron acceptors (benzothiazole, nitryl, dicyanovinyl).
• Fabrication of sandwiched memory devices using the synthesized organic small molecules.
• Characterization of device switching behavior, including volatile SRAM, nonvolatile WORM, and rewritable flash memory functionalities.

Main Results:

• The bi-n-butylcarbazole benzothiazole (BCZ-BT) device demonstrated volatile static random access memory (SRAM) behavior.
• The bi-n-butylcarbazole nitryl (BCZ-NO2) device exhibited stable nonvolatile write-once-read-many-times (WORM) data storage.
• The bi-n-butylcarbazole dicyanovinyl (BCZ-CN) device functioned as rewritable flash memory with a high ON/OFF current ratio (~10^4).

Conclusions:

• Adjusting terminal acceptor groups in organic small molecules provides a viable strategy for creating tunable data storage devices.
• The rational design of organic molecules with specific electronic properties is key to achieving superior memory performance.
• This study offers valuable insights for the development of next-generation organic electronic memory technologies.