Cen Jiajie, Wu Qiyuan, Yan Danhua, Tao Jing, Kisslinger Kim, Liu Mingzhao, Orlov Alexander
Department of Materials and Science Engineering, Stony Brook University, Stony Brook, New York 11794, USA.
Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
Phys Chem Chem Phys. 2017 Jan 25;19(4):2760-2767. doi: 10.1039/c6cp07111b.
A very limited knowledge exists about the effect of non-uniform doping of epitaxially grown strontium titanate thin film electrodes on their photoelectrochemical performance in water splitting. In this work, water splitting photoanodes featuring an n-n homojunction were fabricated by the pulsed laser deposition technique, where epitaxial SrTiO thin films were grown on Nb doped n-SrTiO single crystalline substrates. Thermal diffusion of niobium from doped substrates into the deposited thin films formed an n-n homojunction, which was profiled by angle-resolved XPS and cross-sectional STEM-EDX techniques. This homojunction was found to make a significant impact on the incident photon-to-current efficiency of photoanodes by affecting their depletion width, which was in agreement with the theoretical simulations.
关于外延生长的钛酸锶薄膜电极的非均匀掺杂对其在水分解中的光电化学性能的影响，目前所知非常有限。在这项工作中，通过脉冲激光沉积技术制备了具有n-n同质结的水分解光阳极，其中外延SrTiO薄膜生长在掺铌的n-SrTiO单晶衬底上。铌从掺杂衬底向沉积薄膜的热扩散形成了一个n-n同质结，通过角分辨XPS和横截面STEM-EDX技术对其进行了表征。发现这种同质结对光阳极的入射光子到电流效率有显著影响，这是通过影响其耗尽宽度实现的，这与理论模拟结果一致。
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