Thermally Induced Neodymium-Doped Strategy toward Wide Band Gap Perovskite Solar Cells with a Fill Factor over 86.

To approach the Shockley-Queisser (S-Q) limit in perovskite solar cells (PSCs), enhancing the fill factor (FF), a crucial parameter associated with carrier transport and nonradiative recombination, is of paramount importance. In this paper, the rare earths (RE), neodymium salt is used as dopant of 4-(3-,6-dimethoxy-9h-carbazol-9-butyl) phosphonic acid (MeO-4PACz) to obtain MeO-4PACz:Nd, and Nd migration is induced during annealing. It is worth noting that the uniform diffusion of Nd in the perovskite layer significantly increases the defect-formation energy of perovskite, thus reducing the density of the perovskite defect states, greatly improving the carrier transport rate and inhibited non-radiative recombination.

Imidazole-Based Ionic Liquid Engineering for Perovskite Solar Cells with High Efficiency and Excellent Stability.

Despite the remarkable progress of perovskite solar cells (PSCs), the substantial inherent defects within perovskites restrict the achievement of higher efficiency and better long-term stability. Herein, we introduced a novel multifunctional imidazole analogue, namely, 1-benzyl-3-methylimidazolium bromide (BzMIMBr), into perovskite precursors to reduce bulk defects and inhibit ion migration in inverted PSCs. The electron-rich environment of -N- in the BzMIMBr structure, which is attributed to the electron-rich adjacent benzene ring-conjugated structure, effectively passivates the uncoordinated Pb cations.

Discarded COVID-19 masks-derived-doped porous carbon for lithium-sulfur batteries.

Despite the high theoretical capacity and energy density of lithium-sulfur (Li-S) batteries, the development of Li-S batteries has been slow due to the poor electrical conductivity and the shuttle effect of the electrode materials, resulting in low sulfur utilization and fast long-term cycling capacity decay. The modified carbon materials are often used as sulfur hosts to significantly improve the cycling performance of the materials, but also bring high-cost issues. Here, the porous carbon materials are synthesized quickly and conveniently by the microwave cross-linking method using discarded medical masks as carbon sources and concentrated sulfuric acid as solvent.