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T‑ZnOw/ZnONP Double-Layer Composite Photoanode with One-Dimensional Low-Resistance Photoelectron Channels for High-Efficiency DSSCs

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journal contribution
posted on 14.02.2020, 16:37 by Yashuai Pang, Yang Zhang, Haiwu Zheng, Qiongzhe Yu, Xu Chen, Jihuai Wu, Qiwei Jiang
To enable the ZnO photoanode obtain superior photovoltaic performance, here, we design a T-ZnOw/ZnONP double-layer structure composite photoanode, in which tetra-needle-like zinc oxide whiskers (T-ZnOw) are used as the light scattering layer, the needles of T-ZnOw inserted into the ZnO nanoparticles (ZnONP) layer form a unique ZnO needle array structure, which acts as one-dimensional (1-D) low resistance channels and enables photoelectrons to reach the fluorine-doped tin oxide (FTO) conductive layer through relatively small number of interfaces. These characteristics make this double-layer structure photoanode possess lower photoelectron transport resistance and lower photoelectron recombination probability, resulting in higher photovoltaic efficiency compared with the traditional single-layer ZnONP photoanode. Moreover, the proposed self-adsorption and self-insertion preparation method of the T-ZnOw layer offer a novel strategy to form 1-D array structures.

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