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Photocurrent Enhancement by Spontaneous Formation of a p-n Junction in Calcium-Doped Bismuth Vanadate Photoelectrodes.
ChemPlusChem ( IF 3.4 ) Pub Date : 2018-05-30 , DOI: 10.1002/cplu.201800119
Fatwa F Abdi 1 , David E Starr 1 , Ibbi Y Ahmet 1 , Roel van de Krol 1
Affiliation  

The application of bismuth vanadate (BiVO4 ) photoelectrodes for solar water splitting is hindered by the poor carrier transport. To overcome this, multiple donor-doping strategies (e.g. dual doping, gradient doping) have been explored. Here, we show for the first time the successful introduction of calcium (Ca) as an acceptor-type dopant into BiVO4 photoelectrodes. Interestingly, instead of generating cathodic photocurrents, the Ca-doped BiVO4 photoelectrodes show anodic photocurrents with an enhanced carrier separation efficiency. Hard X-ray photoelectron spectroscopy (HAXPES) shows that this enhancement is caused by out-diffusion of Ca during the deposition process, which spontaneously creates a p-n junction within the BiVO4 layer. Overall, a significant two-fold improvement of the AM1.5 photocurrent is obtained upon Ca-doping. This study highlights the importance of controlled doping beyond simply modifying carrier concentration and may enable new device architectures in photoelectrode materials.

中文翻译:

通过自发形成钙掺杂的钒酸铋光电电极中的pn结来增强光电流。

由于载流子传输不良,阻碍了钒酸铋(BiVO4)光电极在太阳能水分解中的应用。为了克服这个问题,已经探索了多种施主掺杂策略(例如双重掺杂,梯度掺杂)。在这里,我们首次展示了将钙(Ca)作为受体型掺杂剂成功地引入BiVO4光电极中的情况。有趣的是,代替产生阴极光电流,Ca掺杂的BiVO4光电极显示出具有增强的载流子分离效率的阳极光电流。硬X射线光电子能谱(HAXPES)表明,这种增强是由于在沉积过程中Ca向外扩散引起的,Ca的自发扩散在BiVO4层内自发地形成了一个pn结。总体而言,Ca掺杂可以使AM1.5光电流显着提高两倍。
更新日期:2018-05-30
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