Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

High-Quality Perovskite Materials Developed Capable of Utilizing Long-Wavelength Sunlight

04.11.2015

A research group from National Institute for Materials Science (NIMS) in Japan has developed the new method to fabricate high-quality perovskite materials capable of utilizing long-wavelength sunlight of 800 nm or longer.

Moving toward the Realization of Low-Cost, High-Efficiency Solar Cells


Figure: (a) Fabrication method for a high-quality perovskite material; (b) X-ray diffraction patterns of perovskite materials prepared with different methods. The x-axis represents the intensity of X-ray diffraction while the y-axis denotes the X-ray diffraction angle.

Copyright : NIMS

A NIMS research team led by Liyuan Han, director of the Photovoltaic Materials Unit, has developed the world’s first method to fabricate high-quality perovskite materials capable of utilizing long-wavelength sunlight of 800 nm or longer.

Compared to conventional methods, this method enables the creation of perovskite materials that have a 40-nm wider optical absorption spectrum, a high short-circuit current and high open-circuit voltage. Thus, this method is regarded as a new approach to enhance the efficiency of perovskite solar cells.

The currently available perovskite solar cells possess optical absorption spectra skewed toward shorter wavelengths. To improve the energy conversion efficiency of these cells, it is vital to develop perovskite materials with optical absorption spectra expanded to include longer wavelengths.

Accordingly, several research institutes are developing perovskite materials, (MA)xFA1—xPbI3, which include two types of cations, MA and FA, capable of absorbing light in the longer wavelength region. However, these cations have demerits: their mixing ratio and crystallization temperature are difficult to control. Moreover, due to their tendency to form a mixed crystal phase, there had been no effective method established to fabricate high-purity, single-crystalline perovskite materials.

To resolve these issues, we developed a new method to fabricate a new type of mixed cation-based perovskite material. We first fabricated a pure, single-crystalline precursor material, (FAI)1—xPbI2, under altering temperatures. Then, we performed a reaction between the precursor and MAI (methylammonium iodide).

The resulting perovskite material, (MA)xFA1—xPbI3, was a single crystalline phase and had a long fluorescence lifetime. These observations indicated that electrons in the material rarely recombine and they have long lifetimes. The optical absorption spectrum of the solar cells employing this material covered up to 840 nm, which was 40 nm wider than the spectrum of conventional perovskite material (MA3PbI3). As a result, the solar cells we developed obtained 1.4 mA/cm2 higher short-circuit current than the MAPbI3 solar cells that were manufactured under the same conditions.

In future studies, we intend to develop high-quality perovskite solar cells capable of utilizing a broader spectrum of sunlight by adjusting the ratio of the two cations.

A part of these results were obtained through research activities under the research topic “Device physics of dye-sensitized solar cells” in the research area “Creative research for clean energy generation using solar energy” (Research Supervisor: Masafumi Yamaguchi, Principal Professor, Toyota Technological Institute) specified in the Core Research of Evolutional Science and Technology (CREST) program sponsored by the Japan Science and Technology Agency (JST).


Associated links
Original article from NIMS

Mikiko Tanifuji | Research SEA
Further information:
http://www.researchsea.com

More articles from Materials Sciences:

nachricht Scientist invents way to trigger artificial photosynthesis to clean air
26.04.2017 | University of Central Florida

nachricht Researchers invent process to make sustainable rubber, plastics
25.04.2017 | University of Delaware

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

Scientist invents way to trigger artificial photosynthesis to clean air

26.04.2017 | Materials Sciences

Ammonium nitrogen input increases the synthesis of anticarcinogenic compounds in broccoli

26.04.2017 | Agricultural and Forestry Science

SwRI-led team discovers lull in Mars' giant impact history

26.04.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>