CuInS_2/Mn-CdS quantum dot co-sensitized flexible solar cells based on single fibrous TiO_2 nanowire arrays

摘要

TiO_2 nanowire arrays are prepared on Ti wire by a hydrothermal process, which are co-sensitized with CuInS_2/Mn-CdS quantum dots to fabricate the solar cells with Cu_2S/brass as the counter electrode. The UV-Vis absorption spectra observe that the deposition of CuInS_2/ Mn-CdS quantum dots on the TiO_2 photoanodes obviously improves its optical absorption properties. The influence of the length of TiO_2 nanowire arrays is also investigated, which indicates that the solar cells with 20 urn TiO_2 nanowire arrays in length have the best photovoltaic performance. The diameter of Cu_2S/brass counter electrode has a significant influence on the illuminated area and electrocatalytic ability of the solar cells. For comparison, the fibrous CuInS_2/Mn-CdS quantum dot co-sensitized solar cells using the Cu_2S counter electrode of 100 μm in diameter exhibits a photovoltaic power conversion efficiency of 3.51 %.