Yb2O3/Au Upconversion Nanocomposites with Broad-Band Excitation for Solar Cells

详细信息    查看全文

• 作者：Tong Liu ; Xue Bai ; Chuang Miao ; Qilin Dai ; Wen Xu ; Yanhao Yu ; Qidai Chen ; Hongwei Song
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：February 13, 2014
• 年：2014
• 卷：118
• 期：6
• 页码：3258-3265
• 全文大小：486K
• ISSN：1932-7455

文摘

Luminescent upconversion (UC) is a promising way to harvest near-infrared (NIR) sunlight and improve the power conversion efficiency (PCE) of solar cells. However, most of efficient upconversion phosphors (UCPs) are based on 4f鈥?f transitions of rare earth (RE) ions, which have only a narrower excitation band matching with sun spectrum. To solve this significant problem, we designed and fabricated a novel kind of efficient UC nanocomposites, Yb₂O₃/Au, in which the upconversion luminescence (UCL) of Yb₂O₃ was a white broad band that originated from electron鈥揾ole recombination, and the excitation bands were expanded at least a range of 770鈥?80 nm through the energy transfer (ET) from anisotropic gold nanoparticles (GNPs) to the Yb₂O₃ host. To our knowledge, the direct ET from the noble metal to the lanthanide phosphors has never been evidenced. Exploring Yb₂O₃/Au as the upconverter of a dye-sensitized solar cell (DSSC), NIR photovoltaic response was successfully demonstrated as proof-of-concept.