Improving Photovoltaic Performance of Dye-Sensitized Solar Cell by Modification of Photoanode With g-Csub3/subNsub4/sub/TiOsub2/sub Nanofibers

摘要

In order to improve the photovoltaic performance of dye-sensitized solar cell (DSSC), graphitic carbon nitride (g-Csub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"3/subNsub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"4/sub)/titanium dioxide (TiOsub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"2/sub) nanofibers (NFs) are added into the photoanode of DSSC as an additional layer. g-Csub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"3/subNsub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"4/sub is prepared by high-temperature calcination. Through sol–gel method and electrospinning technology, we prepare g-Csub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"3/subNsub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"4/sub/TiOsub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"2/sub NFs. The material properties of g-Csub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"3/subNsub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"4/sub/TiOsub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"2/sub NFs are characterized through X-ray diffraction (XRD), ultraviolet-visible (UV-Vis), and field emission scanning electron microscope (FE-SEM). From the measurements of electrochemical impedance spectroscopy (EIS), incident photon to current efficiency (IPCE), and inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" tex-math notation="LaTeX"${J}-{V}$ /tex-math/inline-formula characteristics, the performances of the DSSCs are analyzed, including impedance parameters, short-circuit current density, open-circuit voltage, fill factor, and photoelectric conversion efficiency. The results show that the addition of g-Csub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"3/subNsub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"4/sub/TiOsub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"2/sub NFs is able to enhance the photovoltaic performance. The photoelectric conversion efficiency of the modified DSSC is increased to 5.22%. Compared with the photoelectric conversion efficiency of the DSSC without modification (4.11%), it is an increase of 27%.