Efficient, stable silicon tandem cells enabled by anion-engineered wide-bandgap perovskites
Maximizing the power conversion efficiency (PCE) of perovskite/silicon tandem solar cells that can exceed the Shockley-Queisser single-cell limit requires a high-performing, stable perovskite top cell with a wide bandgap. We developed a stable perovskite solar cell with a bandgap of ~1.7 electron volts that retained more than 80% of its initial PCE of 20.7% after 1000 hours of continuous illumination. Anion engineering of phenethylammonium-based two-dimensional (2D) additives was critical for controlling the structural and electrical properties of the 2D passivation layers based on a lead iodide framework. The high PCE of ...
Source: ScienceNOW - April 8, 2020 Category: Science Authors: Kim, D., Jung, H. J., Park, I. J., Larson, B. W., Dunfield, S. P., Xiao, C., Kim, J., Tong, J., Boonmongkolras, P., Ji, S. G., Zhang, F., Pae, S. R., Kim, M., Kang, S. B., Dravid, V., Berry, J. J., Kim, J. Y., Zhu, K., Kim, D. H., Shin, B. Tags: Materials Science r-articles Source Type: news
A spin-pumping antiferromagnet
(Source: ScienceNOW)
Source: ScienceNOW - April 8, 2020 Category: Science Authors: Stajic, J. Tags: Materials Science, Physics twis Source Type: news
Engineering perovskites with anions
(Source: ScienceNOW)
Source: ScienceNOW - April 8, 2020 Category: Science Authors: Szuromi, P. Tags: Materials Science twis Source Type: news
Room-temperature electron ratchets
(Source: ScienceNOW)
Source: ScienceNOW - April 8, 2020 Category: Science Authors: Szuromi, P. Tags: Materials Science, Physics twis Source Type: news
Critical differences in 3D atomic structure of individual ligand-protected nanocrystals in solution
Precise three-dimensional (3D) atomic structure determination of individual nanocrystals is a prerequisite for understanding and predicting their physical properties. Nanocrystals from the same synthesis batch display what are often presumed to be small but possibly important differences in size, lattice distortions, and defects, which can only be understood by structural characterization with high spatial 3D resolution. We solved the structures of individual colloidal platinum nanocrystals by developing atomic-resolution 3D liquid-cell electron microscopy to reveal critical intrinsic heterogeneity of ligand-protected plat...
Source: ScienceNOW - April 1, 2020 Category: Science Authors: Kim, B. H., Heo, J., Kim, S., Reboul, C. F., Chun, H., Kang, D., Bae, H., Hyun, H., Lim, J., Lee, H., Han, B., Hyeon, T., Alivisatos, A. P., Ercius, P., Elmlund, H., Park, J. Tags: Chemistry, Materials Science r-articles Source Type: news
