期刊
SOLAR ENERGY
卷 227, 期 -, 页码 1-7出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2021.08.076
关键词
Upconversion nanoparticle; Dye-sensitized solar cell; Low-temperature process; Active anatase TiO2; Surface property
资金
- Ministry of Science and Technology, the Republic of China [MOST 108-2221-E-224-026-MY3]
By incorporating UCNPs into mesoporous TiO2, the photovoltaic performance of dye-sensitized solar cells can be significantly improved, leading to an increase in power conversion efficiency.
Upconversion nanoparticles (UCNPs) can effectively assist solar cells in utilizing near infrared through the anti-Stokes' emission mechanism. We incorporate UCNPs, for the first time, into the mesoporous TiO2 of dye-sensitized solar cells (DSSCs) in a low-temperature fabrication process. The mesoporous TiO2 is designed as a two-layer structure, where the lower layer is prepared from reactive anatase TiO2 chelated by acetic acid (h-TAc). The UCNP incorporation into the lower layer displays a significant improvement in photovoltaic performance. For an optimized UCNP incorporation, the power conversion efficiency (PCE) of the DSSCs can increase from 6.49 to 7.98%, an enhancement of 23%, further exceeding most of the improvement on low-temperature fabricated DSSCs reported in the literature. The enhanced PCE may be ascribed to the increase of photocurrent. We find that the hydrophobic UCNPs reveal better enhancement than hydrophilic UCNPs due to the prevention from the electrolyte penetration. However, the hydrophobic UCNP incorporation may cause the cracking of the mesoporous TiO2 layer. The strong bonding ability of h-TAc effectively alleviates the cracking issue.
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