Journal
IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 68, Issue 3, Pages 1155-1161Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2021.3052154
Keywords
Photovoltaic systems; Titanium dioxide; Lighting; Absorption; Graphene; Glass; Photovoltaic cells; Dye-sensitized solar cell (DSSC); electrospinning; low light intensities; nanofibers (NFs); reduced graphene oxide (rGO); zirconium dioxide
Funding
- Ministry of Science and Technology, Taiwan, Republic of China (ROC) [MOST 108-2221-E-224-019, MOST 1082221-E-224-020]
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This study synthesized titanium dioxide nanofibers doped with ZrO2 and rGO to modify the photoanode of DSSCs, improving the photovoltaic performance. With decreasing light intensity, DSSCs showed an upward trend in photovoltaic performance, reaching a peak photovoltaic conversion efficiency of 9.12%. The enhancement in photovoltaic conversion efficiency was attributed to reduced electron recombination and improved compatibility with the dye N719 under low light intensities.
In this study, we synthesized the titanium dioxide nanofibers (NFs) doped with ZrO2 and reduced graphene oxide (rGO) to modify photoanode of dye-sensitized solar cells (DSSCs). Commercial titanium dioxide P25 was used as the compact layer coated on fluorine doped tin oxide coated glass (FTO) glass and then a layer, which was titanium dioxide P25 mixed with rGO- and ZrO2-doped TiO2 nanofibers, was added beside the compact layer to enhance the photovoltaic performance of DSSCs. The study found that the photovoltaic performance of the DSSCs had an upward trend while the light intensity of 100 mW/cm(2) decreased to 10 mW/cm(2). It was found that the DSSCs modified with the titanium dioxide nanofibers doped with rGO and ZrO2 had the best photovoltaic conversion efficiency, and its photovoltaic conversion efficiency increased from 5.37% to 9.12% from the light intensity of 100 to 10 mW/cm(2). We attributed the increased photovoltaic conversion efficiency to the decrease of the inverse recombination of electrons due to low amount of light energy injected. Moreover, the dye N719 used in the DSSCs had an absorption spectrum in the visible region and the absorption spectrum of the layer, which was titanium dioxide P25 mixed with rGO- and ZrO2-doped TiO2 nanofibers, was more compatible with the dye N719 at low light intensities.
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