期刊
PHYSICAL REVIEW APPLIED
卷 8, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.8.054011
关键词
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资金
- Japan Society for the Promotion of Science (JSPS) KAKENHI [26246014, 16K13661, 17H05144]
- Japan Science and Technology Agency (JST)
- JSPS [17K14370]
- JST
- Grants-in-Aid for Scientific Research [17K14370, 16K13661, 26246014, 17H05144] Funding Source: KAKEN
Layered crystallinity of organic semiconductors is crucial to obtaining high-performance organic thin-film transistors (OTFTs), as it allows both smooth-channel-gate-insulator interface formation and efficient two-dimensional carrier transport along the interface. However, the role of vertical transport across the crystalline molecular layers in device operations has not been a crucial subject so far. Here, we show that the interlayer carrier transport causes unusual nonlinear current-voltage characteristics and enormous access resistance in extremely high-quality single-crystal OTFTs based on 2-decyl-7-phenyl[1]benzothieno[3; 2-b][1]-benzothiophene (Ph-BTBT-C-10) that involve inherent multiple semiconducting pi-conjugated layers interposed, respectively, by electrically inert alkyl-chain layers. The output characteristics present layer-number (n)-dependent nonlinearity that becomes more evident at larger n (1 <= n <= 15), demonstrating tunneling across multiple alkyl-chain layers. The n-dependent device mobility and four-probe measurements reveal that the alkyl-chain layers generate a large access resistance that suppresses the device mobility from the intrinsic value of about 20 cm(2) V-1 s(-1). Our findings clarify the reason why device characteristics are distributed in single-crystal OTFTs.
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