No abstract

No abstract

No abstract

No abstract

Cu 2 AgInS 2 Se 2 alloyed quantum dots are synthesized through a simple hot injection method. Its tetragonal structure and crystallite size are determined by using X-ray diffraction analysis. Its optical properties are observed by using Ultraviolet-Vis absorption and PL emission spectroscopies. The oxidation state and elemental composition of Cu 2 AgInS 2 Se 2 quantum dots are confirmed by X-ray photoelectron spectroscope analysis and energy dispersive X-ray analysis, respectively. The optical bandgap of the synthesized quantum dots is measured to be 1.29 eV. The synthesized Cu 2 AgInS 2 Se 2 quantum dots are sensitized onto the porous TiO 2 nanofibers (CAISSe/P-TiO 2 ) and its morphological and optical properties are examined. The quantum dot sensitized solar cell is assembled using CAISSe/P-TiO 2 , polysulfide and Cu 2 S as the photoanode, electrolyte and the counter electrode exhibited photoconversion efficiency (PCE) of 5.87%, which is significantly higher than that assembled using Cu 2 AgInSe 4 (4.21%) and Cu 2 AgInS 4 (4.89%) quantum dots sensitized porous TiO 2 NFs as the photoanodes.