Band-Like Carrier Transport at the Single-Crystal Contact Interfaces between 2,5-Difluoro-7,7,8,8-tetracyanoquinodimethane and Electron Donors
Band-Like Carrier Transport at the Single-Crystal Contact Interfaces between 2,5-Difluoro-7,7,8,8-tetracyanoquinodimethane and Electron Donors
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DOI：
10.1021/acs.jpclett.7b03053
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发表时间：
2018-01-18
影响因子：
5.7
通讯作者：
Inabe, Tamotsu
中科院分区：
文献类型：
--
作者：
Shimada, Takuro;Takahashi, Yukihiro;Inabe, Tamotsu
一些与分子固体形成的异质结界面表现出类似金属的输运行为。为了阐明这一要求，我们采用单晶电子受体2，5-二氟-7，7，8，8-四氰基醌二甲烷（F（2）TCNQ）和具有宽范围电离势的电子供体分子叠层的方法制备了界面。载流子注入的受主和施主晶体之间的高导电界面，其中一些表现出带状的电荷输运行为。与弱施主的组合也导致了具有带状输运性质的界面。因此，在施主晶体和受主晶体的能带能量不匹配的界面上实现了带状传导。结果表明，这类化合物在有机晶体电子结构修饰方面具有很大的潜力。本方法预期能够控制界面的电子性质。
Some heterojunction interfaces formed with molecular solids show metal-like transport behavior. In order to clarify the requirement, interfaces are fabricated by lamination of single-crystal electron-accepting 2,5-difluoro-7,7,8,8-tetracyanoquinodimethane (F(2)TCNQ) and electron donating molecules with a wide range of ionization potentials. Carrier injection between the acceptor and donor crystals leads to highly conducting interfaces, some of which exhibited band-like charge transport behaviors. Combinations with weak donors also resulted in interfaces with band-like transport properties. Accordingly, band-like conduction was achieved for interfaces where the donor and acceptor crystals do not have well-matched band energies. The results indicate that the wide range of candidates have great potential for modification of the electronic structure of organic crystals. The present method is expected to enable control of the electronic properties of the interface.