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New research: semiconductor isomorphism can improve LED design

According to foreign media reports, researchers from the Moscow Institute of Physics and Technology (MIPT) found that superinjection (previously believed to have effects that could only occur in semiconductor heterostructures) may also occur in homostructures (consisting of a single semiconductor material) structure). They point out that most known semiconductors can be used to build homogeneous structures capable of super-injection, and the discovery could provide a whole new approach to light source development and production.

Researchers say that diamond and many emerging wide bandgap semiconductor materials have excellent optical and magnetic properties. However, these materials cannot be doped as effectively as silicon or gallium arsenide, which limits their practical applications.

The MIPT team predicted the super-injection effect in diamond pin diodes. Compared to the doping of n-type implanted layers, they found that this method allows more orders of magnitude electrons to be injected into the diode's i-region. The team believes that the electron concentration generated in the diamond diode by superinjection may be 10,000 times higher than previously thought. Therefore, researchers said that diamond may be used as the basis of UV LEDs, thousands of times brighter than current theoretical calculations predict.

“令人惊讶的是,相比大多数大众市场的半导体LED和基于异质结构的激光器,金刚石中的超注射效果要强50到100倍。 Researcher Igor Khramtsov said: "It is surprising that compared to most mass market semiconductor LEDs and heterostructure-based lasers, the superinjection effect in diamond is 50 to 100 times stronger. "

“针对硅和锗的超注射需要低温,可能会对其效用产生影响。 但在金刚石或氮化镓中,即使是在室温下也可进行强烈的超注射。 Researcher Dmitry Fedyanin pointed out: "The ultra-injection for silicon and germanium requires low temperatures, which may affect its effectiveness. But in diamond or gallium nitride, strong over-injection can be performed even at room temperature. "

They point out that super injection can be performed in a variety of semiconductor materials, including traditional wide bandgap semiconductors and new 2D materials. In this way, it can open up new ways for the design of high-efficiency blue, violet, ultraviolet and white LEDs and optical wireless communication (Li-Fi) light sources, new lasers, quantum Internet transmitters, and optical equipment for early disease diagnosis.

Their research results have been published in Semiconductor Science and Technology.

15:40 April 28, 2019 15:40
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