A study of resonant cavity-enhanced light-emitting diodes based on a columnar liquid crystal was presented in this article. An organic layer made of the electroluminescent liquid crystal was sandwiched between a Bragg mirror deposited on a silicon substrate and a semitransparent top electrode. The fabrication of the substrates was complementary metal oxide semiconductor compatible, the maximum electroluminescence intensity was enhanced by a factor of 3–4, and the spectral width of the emission could be reduced down to 18 nm, thereby improving the chromaticity coordinates, considerably
Abstract. This paper presents new integration techniques to combine silicon-and dye sensitized solar cells (DSSCs).The idea of this work is to install DSSCs on the back side of silicon solar cell panels to make use of the reflected radiation from the ground or from solar cells arranged behind.It has been shown that the architecture of the combined solar cells can be designed as monolithic structure by depositing the DSSC layers one after the other on the back side of Si-cells or as hybrid structure by combining Si-cells with foil-DSSCs. To enhance the current efficiency the different kinds of cells were connected in parallel. The TiO 2 nano particles, dissolved in dispersion, were coated on foil-or glass substrates. Here, it was possible to enhance the efficiency of dye sensitized solar cells by treating the semiconducting layer with pulsed UV radiation. As a result of the UV light treatment the short circuit current has more than tripled. Nevertheless, the cells maintain their low-cost characteristics, because synthetic dyes have not been used to coloured the nano particles. Additionally, the DSSCs were connected in series. Thus, it was possible to adapt the voltage of the DSSC to the voltage of the Si-cells.
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