论文标题
结构传输相关性揭示了耦合PBS纳米晶体超级晶格的各向异性电荷传输
Structure-transport correlation reveals anisotropic charge transport in coupled PbS nanocrystal superlattices
论文作者
论文摘要
半导体纳米晶体（NCS）可以自组装成有序的超晶格（SLS），以创建具有新兴集体特性的人造固体。计算研究预测，诸如电子耦合或电荷运输之类的属性不仅由单个NC确定，而且还取决于其组织和结构的程度。但是，在NC SL中的结构和电荷传输之间存在相关性的实验证明仍在待处理中。在这里，我们执行X射线纳米划分，并应用角X射线互相关分析（AXCCA）来表征耦合的PBS NC SLS的结构，这些结构与同一SL MicroDOMON的电子性质直接相关。我们发现有力的证据表明SL结晶度对电荷运输的影响并揭示了高度有序的单晶六角形封闭式PBS NC SLS的各向异性电荷转运，这是由于最短粒子间距离的主要作用而引起的。这意味着转运各向异性应该是弱耦合NC SLS的一般特征。
Semiconductive nanocrystals (NCs) can be self-assembled into ordered superlattices (SLs) to create artificial solids with emerging collective properties. Computational studies have predicted that properties such as electronic coupling or charge transport are determined not only by the individual NCs but also by the degree of their organization and structure. However, experimental proof for a correlation between structure and charge transport in NC SLs is still pending. Here, we perform X-ray nano-diffraction and apply Angular X-ray Cross-Correlation Analysis (AXCCA) to characterize the structures of coupled PbS NC SLs, which are directly correlated with the electronic properties of the same SL microdomains. We find strong evidence for the effect of SL crystallinity on charge transport and reveal anisotropic charge transport in highly ordered monocrystalline hexagonal close-packed PbS NC SLs, caused by the dominant effect of shortest interparticle distance. This implies that transport anisotropy should be a general feature of weakly coupled NC SLs.
