Journal
ORGANIC ELECTRONICS
Volume 57, Issue -, Pages 335-340Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2018.02.038
Keywords
Non-volatile memory; Heterojunction; Organic field-effect transistors
Funding
- National Basic Research Program of China [2014CB648300, 2015CB932200]
- National Natural Science Foundation of China [61775100, 61475074, 61775089, 21471082]
- Natural Science Foundation of Jiangsu Province [BK20160088]
- Alliance Fund of Shandong Provincial Key Laboratory [SDKL2016038]
- Special Construction Project Fund for Shandong Province Taishan Scholars
- Synergetic Innovation Center for Organic Electronics and Information Displays, Changjiang Scholars and Innovative Research Team in University [IRT_15R37]
- Talents in Six Fields of Jiangsu Province [XYDXX-047]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Non-volatile heterojunction transistor memory was fabricated by successively depositing pentacene/tris(8-hydroxy quinoline) aluminum(Alq(3)) layers. In this specified configuration, pentacene functioned as the active layer between the source and drain of field-effect transistor memory, and Alq(3) was adopted as the charge-trapping layer. Operation of non-volatile memory was implemented by an electrical writing and light illumination erasing procedure. Band bending between pentacene and Alq(3) due to the formation of a type II heterojunction prohibited back-injection of trapped charges, which demonstrated hysteresis for the transfer characteristics. The specified heterojunction structure (without a tunneling layer) enabled carriers to facilely transport between the active layer and charge trapping layer. Therefore, a large memory window (40.3 V, for a programming voltage of -80 V) and fast writing speed of less than 1 mu s were demonstrated; in addition, the 1-bit non-volatile memory device showed a moderate retention time of more than 2 years. The large memory window, fast writing speed, and long retention time can potentially enable practical applications of non-volatile memory.
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