Electron-Conducting PbS Nanocrystal Superlattices with Long-Range Order Enabled by Terthiophene Molecular Linkers.
Electron-Conducting PbS Nanocrystal Superlattices with Long-Range Order Enabled by Terthiophene Molecular Linkers.
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DOI：
10.1021/acsami.8b06044
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发表时间：
2018-07
影响因子：
9.5
通讯作者：
Alexander André;Michelle Weber;K. Wurst;S. Maiti;F. Schreiber;Marcus Scheele
中科院分区：
文献类型：
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作者：
Alexander André;Michelle Weber;K. Wurst;S. Maiti;F. Schreiber;Marcus Scheele
将PbS纳米晶体与有机半导体5,5″-二硫醇-[2,2':5,2″-噻吩]进行表面功能化，并组装成具有大结构相干性和电子迁移率为0.2 cm2/(V s)的杂化纳米结构薄膜。利用电化学、光谱学和量子力学计算分析了无机/有机界面上的电子结构，发现电子注入分子改变了分子的电子结构，极大地促进了邻近的PbS - 1Se态的耦合。这被场效应和电化学门控输运测量证实，并提供了载流子输运主要通过1Se态发生的证据。所提出的材料允许研究半导体纳米晶体超晶格中的结构-输运相关性和探索输运各向异性。
PbS nanocrystals are surface-functionalized with the organic semiconductor 5,5″-dithiol-[2,2':5,2″-terthiophene] and assembled to afford hybrid nanostructured thin films with a large structural coherence and an electron mobility of 0.2 cm2/(V s). Electrochemistry, optical spectroscopy, and quantum mechanical calculations are applied to elucidate the electronic structure at the inorganic/organic interface, and it is established that electron injection into the molecule alters its (electronic) structure, which greatly facilitates coupling of the neighboring PbS 1Se states. This is verified by field-effect and electrochemically gated transport measurements, and evidence is provided that carrier transport occurs predominantly via the 1Se states. The presented material allows studying structure-transport correlations and exploring transport anisotropies in semiconductor nanocrystal superlattices.