Vol.5 No.1 (February 2015)
Investigation on Preparation of Perovskite Layer and Electron-Transport Materials for Perovskite Solar Cells
In organic-inorganic hybrid halogen perovskite solar cell, the electron transport material and its interface with absorption layer play an important role in the efficiency of photoelectrical conversion. The mesoscopic structures of the electron-transport layer will directly influence the growth of perovskite layer, whose microstructures are crucial for the stability and life-span of solar cells. In this work, the layer of TiO2 nanorod arrays grown by hydrothermal method was used as the electron transport material, and a compact TiO2 thin film deposited on FTO substrate by magnetron sputtering as the blocking layer. It is found that the compact TiO2 layer can effectively inhibit the recombination of electron-hole pairs at interface and thus open-circuit voltage is raised. The perovskite layers were prepared via one-step or two-step chemical solution deposition. The quality of the two-step prepared perovskite layer is much better than the one-step one; the corresponding short-circuit current and efficiency are greatly enhanced compared with the former.
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