Solution-processed perovskite light emitting diodes with efficiency exceeding 15% through additive-controlled nanostructure tailoring

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 () and Baoquan Sun ()
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Muyang Ban: Soochow University
Yatao Zou: Soochow University
Jasmine P. H. Rivett: University of Cambridge
Yingguo Yang: Chinese Academy of Sciences
Tudor H. Thomas: University of Cambridge
Yeshu Tan: Soochow University
Tao Song: Soochow University
Xingyu Gao: Chinese Academy of Sciences
Dan Credgington: University of Cambridge
Felix Deschler: University of Cambridge
Henning Sirringhaus: University of Cambridge
Baoquan Sun: Soochow University

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract 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.

Date: 2018
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DOI: 10.1038/s41467-018-06425-5

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