Department of Physics and Stephenson Institute for Renewable Energy, The University of Liverpool, Chadwick Building, Peach Street, Liverpool, L69 7ZF, UK.
Nanoscale. 2015 Oct 28;7(40):16606-10. doi: 10.1039/c5nr04950d.
We report that the internal quantum efficiency for hydrogen generation in spherical, Pt-decorated CdS nanocrystals can be tuned by quantum confinement, resulting in higher efficiencies for smaller than for larger nanocrystals (17.3% for 2.8 nm and 11.4% for 4.6 nm diameter nanocrystals). We attribute this to a larger driving force for electron and hole transfer in the smaller nanocrystals. The larger internal quantum efficiency in smaller nanocrystals enables a novel colloidal dual-band gap cell utilising differently sized nanocrystals and showing larger external quantum efficiencies than cells with only one size of nanocrystals (9.4% for 2.8 nm particles only and 14.7% for 2.8 nm and 4.6 nm nanocrystals). This represents a proof-of-principle for future colloidal tandem cell.
我们报告称，通过量子限制，球形 Pt 修饰的 CdS 纳米晶体中制氢的内量子效率可以被调节，从而使得较小的纳米晶体的效率高于较大的纳米晶体（2.8nm 直径的纳米晶体为 17.3%，而 4.6nm 直径的纳米晶体为 11.4%）。我们将其归因于在较小的纳米晶体中电子和空穴转移的驱动力更大。较小纳米晶体中更高的内量子效率使得新型胶体双能带隙电池成为可能，该电池利用不同尺寸的纳米晶体，并显示出比仅使用一种尺寸纳米晶体的电池更高的外量子效率（仅 2.8nm 颗粒为 9.4%，而 2.8nm 和 4.6nm 纳米晶体为 14.7%）。这代表了未来胶体串联电池的原理验证。
