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Link: http://www.nature.com/ncomms/2015/151118/ncomms9932/full/ncomms9932.html

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The paper indicates that this could be one of the innovative methods to fabricate solar cells with suitable and low cost processing. 

The perovskite is the name of structure based upon finding the structure of CaTiO₃ by Lev Perovski. This became famous for creating high efficient solar cells. In addition, it needs a process only at temperature of 500 degrees Celcius that is lower than the other processes. (The perovskite crystal absorbs blue and yellow spectra converting into electricity; thus, more efficient solar cells can be made by combining perovskite with others that absorb red and infrared radiation.) 

The substance abbreviated as PCBM (phenyl-C61-butyric acid methyl ester) is a derivative of fullerenes; namely, soccer balls. The other characteristic of PCBM is being resolved in organic solvents contrary to simple fullerenes. It is technically important to eliminate current density-voltage (J-V) hysteresis to have stable semiconductors in the process. PCBM is proven to aid to have such hysteresis. 

In addition to using perovskite, researchers think to use a planar structure which can much lower the temperature for the development. The temperature can eventually be at just 50 degrees Celsius, so we do not need “wet process” to fabricate the solar cells. 

There are still a lot of obstacles to overcome to commercialize such solar cells, but this development could be promising to have more efficient and less costly products.