Cu ₂ AgInS ₂ Se ₂ quantum dots sensitized porous TiO ₂ nanofibers as a photoanode for high‐performance quantum dot sensitized solar cell

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.

Near-infrared photoactive Ag-Zn-Ga-S-Se quantum dots for high-performance quantum dot-sensitized solar cells

“…Preparation of a AZGSSe QD-sensitized TiO 2 NF-based photoanode A pre-prepared TiO 2 nanofiber (NF) paste was coated on FTO glass via the doctor blade method, which was followed by sintering at 450 °C for 30 min as described earlier [8][9][10]. The glass plate was dipped in 0.12 M of titanium tetrachloride solution at 70 °C for 30 min and was then rinsed with distilled water thoroughly and dried at 60 °C.…”

“…In QDSCs, QDs are added to the metal oxides. Our earlier reports demonstrated that porous TiO 2 nanofibers possess an enormous surface area for the maximum absorption of QDs [8][9][10].…”