Steering the behavior of photogenerated carriers in semiconductor photocatalysts: a new insight and perspective,Journal of Materials Chemistry A

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Steering the behavior of photogenerated carriers in semiconductor photocatalysts: a new insight and perspective
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-09-28 , DOI: 10.1039/d1ta06899g
Fang Li _{1,

2} , Lei Cheng _{1,

2} , Jiajie Fan ₃ , Quanjun Xiang _{1,

2}

Affiliation

The current semiconductor photocatalysts only exhibit unsatisfactory photocatalytic efficiency due to the easy recombination of photogenerated carriers. Regulating the separation and transfer of photogenerated carriers and reducing the recombination of photogenerated carriers are essential for improving the catalytic efficiency of photocatalysts. The recombination of photogenerated carriers is produced by the attraction of Coulombic force. Consequently, reducing the recombination of photogenerated carriers requires an additional driving force to counteract the attraction of Coulombic force. However, exploring the mechanism of photogenerated carrier regulation from the perspective of the driving force of photogenerated carrier separation and transfer has received only sporadic attention. This review first starts with the fundamental mechanism of photogenerated carrier recombination and the impairment of photogenerated carrier recombination to photocatalytic performance. Then it focuses on several main strategies for regulating the behavior of photogenerated carriers from the aspect of the driving force for the separation and transfer of photogenerated carriers, including heterojunction design, construction of an intramolecular donor–acceptor (D–A) system, exciton regulation, and electron spin regulation. Subsequently, advanced characterization techniques and the latest developments of theoretical calculations in the separation and migration of photogenerated carriers have been introduced. At the end, we summarize the current challenges of photogenerated carrier regulation and put forward the prospects for future development.

中文翻译：

引导半导体光催化剂中光生载流子的行为：新的见解和视角

由于光生载流子容易复合，目前的半导体光催化剂仅表现出令人不满意的光催化效率。调控光生载流子的分离和转移，减少光生载流子的复合，对于提高光催化剂的催化效率至关重要。光生载流子的复合是由库仑力的吸引力产生的。因此，减少光生载流子的复合需要额外的驱动力来抵消库仑力的吸引力。然而，从光生载流子分离和转移驱动力的角度探索光生载流子调控的机制还只是零星的关注。本综述首先从光生载流子复合的基本机制和光生载流子复合对光催化性能的损害开始。然后从光生载流子分离和转移的驱动力方面重点介绍了几种调节光生载流子行为的主要策略，包括异质结设计、分子内供体-受体（D-A）系统的构建、激子调节，和电子自旋调节。随后，介绍了光生载流子分离和迁移的先进表征技术和理论计算的最新进展。最后，我们总结了当前光生载流子调控面临的挑战，并提出了未来的发展前景。

更新日期：2021-10-21

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