High-performance plastic dye-sensitized solar cells (DSCs) based on low-cost commercial Degussa P25 TiO2 and organic indoline dye D149 have been fabricated using electrophoretic deposition (EPD) with compression post-treatment at room temperature. The pressed EPD electrode outperformed the sintered EPD electrode and as-prepared EPD electrode in short-circuit current density and power conversion efficiency. About 150% and 180% enhancement in power conversion efficiency have been achieved in DSC devices with sintering and compression post-treatment as compared to the as-prepared electrode, respectively.
Several characterizations including intensity modulated photocurrent spectroscopy, incident photon-to-electron conversion efficiency and electrochemical impedance spectra have been employed to reveal the nature of improvement with post-treatment. Experimental results indicate that the sintering and compression post-treatment are beneficial to improve the electron transport and thus lead to the enhancement of photocurrent and power conversion efficiency.
In addition, the compression post-treatment is more efficient than sintering post-treatment in improving interparticle connection in the as-prepared EPD electrode. Under optimized conditions, the conversion efficiency of plastic devices with D149-sensitized P25 TiO2 photoanode has reached 5.76% under illumination of AM 1.5G (100 mW cm–2). This study demonstrates that the EPD combined with compression post-treatment provides a way to fabricate highly efficient plastic photovoltaic devices.
Yin, X., Xue, Z., Wang, L., Cheng, Y. and Liu, B., 2012. High-performance plastic dye-sensitized solar cells based on low-cost commercial P25 TiO2 and organic dye. ACS applied materials & interfaces, 4(3), pp.1709-1715.
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Categories: Solar & Photovoltaics