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Solution-processed perovskite light emitting diodes with efficiency exceeding 15% through additive-controlled nanostructure tailoring.
Nature Communications ( IF 16.6 ) Pub Date : 2018-09-24 , DOI: 10.1038/s41467-018-06425-5
Muyang Ban , Yatao Zou , Jasmine P. H. Rivett , Yingguo Yang , Tudor H. Thomas , Yeshu Tan , Tao Song , Xingyu Gao , Dan Credgington , Felix Deschler , Henning Sirringhaus , Baoquan Sun

Organometal halide perovskites (OHP) are promising materials for low-cost, high-efficiency light-emitting diodes. In films with a distribution of two-dimensional OHP nanosheets and small three-dimensional nanocrystals, an energy funnel can be realized that concentrates the excitations in highly efficient radiative recombination centers. However, this energy funnel is likely to contain inefficient pathways as the size distribution of nanocrystals, the phase separation between the OHP and the organic phase. Here, we demonstrate that the OHP crystallite distribution and phase separation can be precisely controlled by adding a molecule that suppresses crystallization of the organic phase. We use these improved material properties to achieve OHP light-emitting diodes with an external quantum efficiency of 15.5%. Our results demonstrate that through the addition of judiciously selected molecular additives, sufficient carrier confinement with first-order recombination characteristics, and efficient suppression of non-radiative recombination can be achieved while retaining efficient charge transport characteristics.

中文翻译:

通过添加剂控制的纳米结构定制,固溶钙钛矿发光二极管的效率超过15%。

有机金属卤化物钙钛矿(OHP)是低成本,高效发光二极管的有前途的材料。在具有二维OHP纳米片和小的三维纳米晶体分布的薄膜中,可以实现一个能量漏斗,该能量漏斗将激发集中在高效的辐射复合中心。但是,该能量漏斗可能包含无效的途径,因为纳米晶体的尺寸分布,OHP和有机相之间的相分离。在这里,我们证明可以通过添加抑制有机相结晶的分子来精确控制OHP的微晶分布和相分离。我们使用这些改进的材料特性来实现具有15.5%的外部量子效率的OHP发光二极管。
更新日期:2018-09-25
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