Shuo Tian, Yunsen Wang, Shuyun Chen, Zhichao Yu, Di Wu, Jiao Qin, Dianyong Tang, Dianping Tang
catalyzed by the sandwich immunoenzyme, which enabled the development of a PEC immunoassay for the sensitive detection of carcinoembryonic antigen (CEA). The anisotropic separation of photocarriers and the highly selective recognition of target molecules could be effectively achieved by optimizing the ratio of facets exposed and the facets with characteristic adsorption. Combined with density functional theory (DFT) calculations, the electronic structure characteristics and photocarrier transfer behavior of anisotropic facets have been investigated, elucidating the critical role of crystal facet engineering in promoting the anisotropic separation of photocarriers and modulating the kinetics of surface reactions. This work provides an innovative engineering strategy for the development of PEC sensors with high photoelectric conversion efficiency.