Controlled Sulfide Matrix Composite Structure Constructed And Used In Solar Cells

Quantum dot sensitized solar cells (QDSSCs) have become an important researchdirection of solar cells because of their low cost, simple preparation and high efficiency.This paper mainly studied sulfide-based solar cells and their photovoltaic performance,which were mainly based on galena (PbS) quantum dot sensitized solar cells and solarcells fabricated with molybdenum disulfide (MoS2) counter electrode.Different layers of PbS/TiO2composite were firstly prepared with successiveionic layer absorption and reaction (SILAR), followed by building solar cells. Therelationship between absorption layers of PbS quantum dot on TiO2and photoelectricalconversion efficiency were analyzed as well. PbS quantum dot could optimize thestructure of photoanode because of its narrow band gap, which benefited a largeabsorption coefficient in the visible light area.MoS2with different morphologies were prepared by hydrothermal method andthey were used as fabricating counter electrodes for building solar cells. The counterelectrode completed charge transfer by collecting photo generated electrons from theexternal circuit back to the redox shuttle and catalyzing the reduction of triiodide ion.MoS2were synthesized by controlling the proportion of precursors. The catalyticactivity of MoS2and photoelectric conversion efficiency were analyzed as well. MoS2band gap is very close to the visible light and possesses the strong catalytic, whichcould improve the photoelectric conversion efficiency of solar cells.