Interface engineering of Ta(3)N(5) thin film photoanode for highly efficient photoelectrochemical water splitting.
Interface engineering of Ta(3)N(5) thin film photoanode for highly efficient photoelectrochemical water splitting.
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用于高效光电化学水分解的Ta3N5薄膜光阳极界面工程
DOI：
10.1038/s41467-022-28415-4
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发表时间：
2022-02-07
影响因子：
16.6
通讯作者：
Li Y
中科院分区：
文献类型：
--
作者：
Fu J;Fan Z;Nakabayashi M;Ju H;Pastukhova N;Xiao Y;Feng C;Shibata N;Domen K;Li Y
界面工程是提高基于薄膜半导体的太阳能转换装置的效率的成熟策略。Ta_3N_5薄膜光阳极是一种很有前途的光电化学（PEC）分解水的材料。然而，仍然缺乏设计Ta 3 N5薄膜光电阳极的底部和顶部界面的协同努力。在这里，我们采用n型In：GaN和p型Mg：GaN来分别修饰Ta 3 N5薄膜光阳极的底部和顶部界面。所获得的In：GaN/Ta 3 N5/Mg：GaN异质结光阳极显示出增强的体载流子分离能力和更好的光阳极/电解质界面注入效率，这导致Ta 3 N5基光阳极的创纪录高的外加偏压光电流效率为3.46%。此外，In：GaN和Mg：GaN层的作用是通过机械研究区分。虽然In：GaN层主要有助于增强体电荷分离效率，但Mg：GaN层提高了表面电荷注入效率。这项工作证明了适当的界面工程薄膜为基础的光阳极在实现高效的PEC水裂解的关键作用。太阳能到燃料的能量转换需要精心设计的材料特性，以确保有利的电荷载流子运动。在这里，作者采用界面工程的Ta 3 N5薄膜，以加强体载流子分离和界面载流子注入，以提高水的分解效率。
Interface engineering is a proven strategy to improve the efficiency of thin film semiconductor based solar energy conversion devices. Ta3N5 thin film photoanode is a promising candidate for photoelectrochemical (PEC) water splitting. Yet, a concerted effort to engineer both the bottom and top interfaces of Ta3N5 thin film photoanode is still lacking. Here, we employ n-type In:GaN and p-type Mg:GaN to modify the bottom and top interfaces of Ta3N5 thin film photoanode, respectively. The obtained In:GaN/Ta3N5/Mg:GaN heterojunction photoanode shows enhanced bulk carrier separation capability and better injection efficiency at photoanode/electrolyte interface, which lead to a record-high applied bias photon-to-current efficiency of 3.46% for Ta3N5-based photoanode. Furthermore, the roles of the In:GaN and Mg:GaN layers are distinguished through mechanistic studies. While the In:GaN layer contributes mainly to the enhanced bulk charge separation efficiency, the Mg:GaN layer improves the surface charge inject efficiency. This work demonstrates the crucial role of proper interface engineering for thin film-based photoanode in achieving efficient PEC water splitting. Solar-to-fuel energy conversion requires well-designed materials properties to ensure favorable charge carrier movement. Here, authors employ interface engineering of Ta3N5 thin film to enhance bulk carrier separation and interface carrier injection to improve the water-splitting efficiency.
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