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Molybdenum disulfide holds promise for light absorption

Light-capturing properties of atomically thin MoS2 probed

Date:
May 5, 2016
Source:
Rice University
Summary:
Using a layer of molybdenum disulfide less than 1 nanometer thick, researchers have designed a system that can absorb more than 35 percent of incident light in the 400- to 700-nanometer wavelength range.
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Using a layer of molybdenum disulfide less than one nanometer thick, researchers in Rice University's Thomann lab were able to design a system that absorbed more than 35 percent of incident light in the 400- to 700-nanometer wavelength range.
Credit: Thomann Group/Rice University

Mechanics know molybdenum disulfide (MoS2) as a useful lubricant in aircraft and motorcycle engines and in the CV and universal joints of trucks and automobiles. Rice University engineering researcher Isabell Thomann knows it as a remarkably light-absorbent substance that holds promise for the development of energy-efficient optoelectronic and photocatalytic devices.

"Basically, we want to understand how much light can be confined in an atomically thin semiconductor monolayer of MoS2," said Thomann, assistant professor of electrical and computer engineering and of materials science and nanoengineering and of chemistry. "By using simple strategies, we were able to absorb 35 to 37 percent of the incident light in the 400- to 700-nanometer wavelength range, in a layer that is only 0.7 nanometers thick."

Thomann and Rice graduate students Shah Mohammad Bahauddin and Hossein Robatjazi have recounted their findings in a paper titled "Broadband Absorption Engineering To Enhance Light Absorption in Monolayer MoS2," which was recently published in the American Chemical Society journal ACS Photonics. The research has many applications, including development of efficient and inexpensive photovoltaic solar panels.

"Squeezing light into these extremely thin layers and extracting the generated charge carriers is an important problem in the field of two-dimensional materials," she said. "That's because monolayers of 2-D materials have different electronic and catalytic properties from their bulk or multilayer counterparts."

Thomann and her team used a combination of numerical simulations, analytical models and experimental optical characterizations. Using three-dimensional electromagnetic simulations, they found that light absorption was enhanced 5.9 times compared with using MoS2 on a sapphire substrate.

"If light absorption in these materials was perfect, we'd be able to create all sorts of energy-efficient optoelectronic and photocatalytic devices. That's the problem we're trying to solve," Thomann said.

She is pleased with her lab's progress but concedes that much work remains to be done. "The goal, of course, is 100 percent absorption, and we're not there yet."


Story Source:

Materials provided by Rice University. Original written by Jade Boyd. Note: Content may be edited for style and length.


Journal Reference:

  1. Shah Mohammad Bahauddin, Hossein Robatjazi, Isabell Thomann. Broadband Absorption Engineering to Enhance Light Absorption in Monolayer MoS2. ACS Photonics, 2016; DOI: 10.1021/acsphotonics.6b00081

Cite This Page:

Rice University. "Molybdenum disulfide holds promise for light absorption: Light-capturing properties of atomically thin MoS2 probed." ScienceDaily. ScienceDaily, 5 May 2016. <www.sciencedaily.com/releases/2016/05/160505140738.htm>.
Rice University. (2016, May 5). Molybdenum disulfide holds promise for light absorption: Light-capturing properties of atomically thin MoS2 probed. ScienceDaily. Retrieved May 23, 2017 from www.sciencedaily.com/releases/2016/05/160505140738.htm
Rice University. "Molybdenum disulfide holds promise for light absorption: Light-capturing properties of atomically thin MoS2 probed." ScienceDaily. www.sciencedaily.com/releases/2016/05/160505140738.htm (accessed May 23, 2017).

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