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This is the world's first technique to make high-quality perovskite materials using long-wavelength sunlight of 800 nanometers or longer, in order to permit a wider absorption spectrum than normally possible, according to HNGN.

The existing perovskite solar cells are made with shorter wavelengths, even though the creation of "perovskite materials with optical absorption spectra expanded to include longer wavelengths" would boost effectiveness, reports the National Institute for Materials Science    

This novel material is called (MA)xFA1-xPbI3, and blends the two cations MA and FA. They are able to absorb light at longer wavelengths, but the "demerits" that go with them include "a mixing ratio and crystallization temperature" which are tough to bring under control.

Moreover, they form a mixed crystal phase, and hence it is almost impossible to have a method that can "fabricate high-purity, single-crystalline perovskite materials".

One team of scientists created a novel technique in order to blend and form mixed cation-based perovskite material, leading to a perovskite material that had a single crystalline phase and long fluorescence lifetime.

As the optical absorption of the new material was 40 nm wider than existing models, it was infinitely more efficient.

"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," the researchers concluded.

The findings were published in a recent edition of the Journal Advanced Materials.