Surface Modification of CdSe Quantum-Dot Floating Gates for Advancing Light-Erasable Organic Field-Effect Transistor Memories

ACS Nano
Yong Jin JeongJaeyoung Jang

Abstract

Photoresponsive transistor memories that can be erased using light-only bias are of significant interest owing to their convenient elimination of stored data for information delivery. Herein, we suggest a strategy to improve light-erasable organic transistor memories, which enables fast "photoinduced recovery" under low-intensity light. CdSe quantum dots (QDs) whose surfaces are covered with three different organic molecules are introduced as photoactive floating-gate interlayers in organic transistor memories. We determine that CdSe QDs capped or surface-modified with small molecular ligands lead to efficient hole diffusion from the QDs to the conducting channel during "photoinduced recovery", resulting in faster erasing times. In particular, the memories with QDs surface-modified with fluorinated molecules function as normally-ON type transistor memories with nondestructive operation. These memories exhibit high memory ratios over 105 between OFF and ON bistable current states for over 10 000 s and good dynamic switching behavior with voltage-driven programming processes and light-assisted erasing processes within 1 s. Our study provides a useful guideline for designing photoactive floating-gate materials to achieve desirable...Continue Reading

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Citations

Sep 30, 2020·Nanotechnology·S Pokhriyal, S Biswas
Jul 8, 2020·ACS Applied Materials & Interfaces·Xiaowu TangSe Hyun Kim
Oct 19, 2019·ACS Applied Materials & Interfaces·Chien-Chung ShihWen-Chang Chen
Mar 24, 2020·Chemical Reviews·Ziyu LvSu-Ting Han
Sep 11, 2021·ACS Applied Materials & Interfaces·Mei-Nung ChenYu-Cheng Chiu

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