A composite consisting of a phase‐separated porous polymer network and a liquid crystal that can change its structural color (covering the whole visible region) in response to temperature is reported by Yukikazu Takeoka and co‐workers. The response is achieved by means of changes in both the diffraction properties and the wavelength dispersions of the refractive indices.

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One of the most important factors influencing silicon solar cells performances is the front side reflectivity. Consequently, new methods for efficient reduction of this reflectivity are searched. This has always been done by creating a rough surface that enables incident light of being absorbed within the solar cell. Combination of texturization‐porous silicon surface treatment was found to be an attractive technical solution for lowering the reflectivity of monocrystalline silicon (c‐Si). The texturization of the monocrystalline silicon wafer was carried out by means of mechanical grooving. A specific etching procedure was then applied to form a thin porous silicon layer enabling to remove mechanical damages. This simple and low cost method reduces the total reflectivity from 29% to 7% in the 300 ‐ 950 nm wavelength range and enhances the diffusion length of the minority carriers from 100 µm to 790 µm (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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