Interlayers help perovskite crystallisation for high-performance light-emitting diodes

phys.org | 2/14/2019 | Staff
monna (Posted by) Level 3
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Scientists at LiU working with colleagues from China have shown how to achieve efficient perovskite light-emitting diodes (LEDs). In an article published in Nature Communications, they provide guidelines on fabricating high-quality perovskite light emitters, and consequently high-efficiency perovskite LEDs.

The halide perovskites, which are defined by their crystal structures, can be easily prepared by low-cost solution processing from precursor solution comprising metal halides and organic halides. The resulting perovskites possess excellent optical and electrical properties, making them promising candidates for various kinds of optoelectronic devices, such as solar cells, LEDs and photodetectors.

Perovskites - Amounts - Defects - Vacancies - Control

Since solution-processed perovskites contain large amounts of defects, which are mostly halide vacancies, efficient control of the perovskite crystallinity is required for high-performance optoelectronic devices. The research group at LiU, under the leadership of Senior Lecturer Feng Gao, in collaboration with scientists from Nanjing Tech University, and Soochow University in China, has now studied how the precursor components and the interfaces affect the crystallisation process of perovskites.

"We and several other groups found that simply introducing an extra amount of organic halides in the precursor can help to passivate the defects and achieve highly emissive perovskite films" says Zhongcheng Yuan, Ph.D. student in Department of Physics, Chemistry and Biology (IFM) at LiU, who is the first author of the article. The excess organic halides, however, hamper the perovskite crystallisation, resulting in low-conductivity perovskite emissive layers and poor-performance LEDs.

Scientists - Dilemma

The scientists have now resolved this dilemma by supporting the...
(Excerpt) Read more at: phys.org
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