Hairdressing is now able to repair defects in the process of film material efficiency increased by 100 times

Engineers at the University of California at Berkeley and the Laurence National Laboratory in have discovered a new process for repairing common defects in thin films, according to cnbeta. This discovery can promote the development of atomic level single layer semiconductor, suitable for transparent LED screen, high efficiency solar cells, as well as micro transistor. Through the treatment of a single layer of semiconductors made of molybdenum disulfide with a super strong organic acid, researchers have been able to make the material more than 100 times more efficient. Lead researcher, professor at University of California at Berkeley Ali Javey, said: "this study is the first demonstration of 'a perfect single layer of optoelectronic materials', we have never heard of such a thin material can do".

Shown here is a defect free MoS2 is excited by laser (MoS2) semiconductor monolayer, which contributes to a transparent LED display, ultra high efficiency solar panel, photoelectric detector, and the development of nanoscale transistors.

The researchers created a layer of molybdenum disulfide with a thickness of only 7/10 nm, thinner than the diameter of 2.5nm DNA. The material is immersed in a super acid, which is able to remove the contaminants and fill the missing atoms to repair the defect. This chemical reaction is called proton implantation (protonation)

The industry's strong interest in single - layer semiconductors is due to its low absorption of light and the ability to withstand torsion due to bending and other stresses. This makes it an ideal choice for transparent or flexible devices, such as deformable high performance LED displays and devices that can be turned off when power is off.

Pictured above left -Cal Logo shape of a single layer of semiconductor MoS2; top right - after the effect of super acid treatment.

This process can also improve the performance of the transistor by removing defects, and when the chip becomes smaller and thinner, the defect has become an important obstacle to the development of the computer.

Javey said: "the development of a defect free monolayer material, but also can clear away many of the problems encountered in the development of new types of low-power switches". The team's work has been published in a recent issue of the journal Nature (Science).