二硫化钼中近乎完美的光致发光量子产率。
Near-unity photoluminescence quantum yield in MoS₂.
机构信息
Electrical Engineering and Computer Sciences, University of California, Berkeley, Berkeley, CA 94720, USA. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Electrical Engineering and Computer Sciences, University of California, Berkeley, Berkeley, CA 94720, USA. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. Computer, Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia. Department of Electrical Engineering, Institute of Electronics Engineering, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
出版信息
Science. 2015 Nov 27;350(6264):1065-8. doi: 10.1126/science.aad2114.
Two-dimensional (2D) transition metal dichalcogenides have emerged as a promising material system for optoelectronic applications, but their primary figure of merit, the room-temperature photoluminescence quantum yield (QY), is extremely low. The prototypical 2D material molybdenum disulfide (MoS2) is reported to have a maximum QY of 0.6%, which indicates a considerable defect density. Here we report on an air-stable, solution-based chemical treatment by an organic superacid, which uniformly enhances the photoluminescence and minority carrier lifetime of MoS2 monolayers by more than two orders of magnitude. The treatment eliminates defect-mediated nonradiative recombination, thus resulting in a final QY of more than 95%, with a longest-observed lifetime of 10.8 ± 0.6 nanoseconds. Our ability to obtain optoelectronic monolayers with near-perfect properties opens the door for the development of highly efficient light-emitting diodes, lasers, and solar cells based on 2D materials.
二维（2D）过渡金属二卤化物已成为光电应用中很有前途的材料体系，但它们的主要衡量标准，即室温下的光致发光量子产率（QY），非常低。典型的二维材料二硫化钼（MoS2）的最大 QY 报告为 0.6%，这表明存在相当大的缺陷密度。在这里，我们报告了一种通过有机超酸进行的稳定、基于溶液的化学处理方法，该方法可将 MoS2 单层的光致发光和少子寿命均匀提高两个数量级以上。该处理消除了缺陷介导的非辐射复合，从而导致最终 QY 超过 95%，最长观察到的寿命为 10.8±0.6 纳秒。我们能够获得具有近乎完美性能的光电单层材料，为基于 2D 材料的高效发光二极管、激光和太阳能电池的发展开辟了道路。
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