Novel Authentic and Ultrafast Organic Photorecorders Enhanced by AIE-Active Polymer Electrets via Interlayer Charge Recombination |
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Authors: | Chun-Yao Ke Mei-Nung Chen Mu-Huai Chen Yen-Ting Li Yu-Cheng Chiu Guey-Sheng Liou |
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Affiliation: | 1. Institute of Polymer Science and Engineering, National Taiwan University, No.1, Sec. 4, Roosevelt Road, Taipei, 10617 Taiwan;2. Department of Chemical Engineering, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Rd., Da'an Dist., Taipei City, 10607 Taiwan |
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Abstract: | Organic photonic memory, featuring a variety of glamorously light-driven characteristics, is rapidly growing into an indispensable building block for next-generation optical communication systems. However, the ambiguity of their operating mechanism associated with the limitation of photoadaptive materials as an electronics promoter results in the slow development of photonic transistor-based devices. In this study, the conjugated polymers composed of donor–acceptor motifs with typical aggregation-induced emission (AIE) behaviors are designed and successfully discover high-performance photoprogrammable memory. Moreover, the mechanism of photoboosted recording behavior, attributed to the recombination of the formed interlayer excitons right after simultaneous excitation without applying vertical and parallel electric-field at the interface in-between active semiconductor and AIE polymers, is cautiously corroborated by steady-state PL and pulse PL measurements. The AIE-polymer memory devices perform ultrafast photoresponse time of 0.1 ms, an outstanding current switch ratio up to 106, and retention stability over 40 000 s without significant dissipation. Furthermore, photoresponsive AIE-polymer electrets not only modulate the memory performance through the emission wavelength but easily switch storage behavior of nonvolatile memory from flash to WORM by adjusting the torsion-angle through the motif of the donor and acceptor moieties. These findings open an avenue for designing conjugated polymer electret for ultrafast optical storage devices. |
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Keywords: | AIE polymers interlayer exciton photonic transistor memory polymer electrets pulse PL |
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