When searching for these structures in reviews about CO 2 reduction, we just found brief mentions of it . Nevertheless, we did come across reviews specifically discussing the application of these structures in CO 2 photo-reduction, indicating their potential as promising catalysts in this field. Interestingly, we noted that these reviews were all published after 2020 . Upon analyzing the sentences extracted from our corpus, we discovered that the first mention of this structure was in a paper published in 2017 by Xu et al. , which coincidentally was also cited in the review by Wu et al. . Actually, according to the own authors of this paper "is the first report on artificial photosynthesis based on halide perovskite QDs".