▲ Vol 12 Issue 48 | December 22 , 2022

Halide Diffusion Equilibrium and Its Impact on Efficiency Evolution of Perovskite Solar Cells

Qing Li, Yichu Zheng, Zhanpeng Wei, Jin Xie, Can Zou, Xinyi Liu, Da Liu, Ziren Zhou, Hua Gui Yang, Shuang Yang, Yu Hou

Perovskite Solar Cells
The halide diffusion from perovskites can chemically dope the electron transport layer and bring forth the nonstoichiometric perovskite surface, leading to initial enhancement but long-term loss of the photovoltaic efficiency of p-i-n cells. In article number 2202982, Shuang Yang, Yu Hou, and co-workers show that in striking contrast, pre-doping strategies can reach the diffusion equilibrium state for the fresh-fabricated device and improve device efficiency and stability.

https://onlinelibrary.wiley.com/doi/10.1002/aenm.202270203

▲ Vol 22 Issue 24 | December 28 , 2022

Ultralow-Loss Phonon Polaritons in the Isotope-Enriched α-MoO3

Yongqian Zhao, Jiancui Chen, Mengfei Xue, Runkun Chen, Shangtong Jia, Jianjun Chen, Lihong Bao, Hong-Jun Gao, and Jianing Chen

α-MoO3, a natural van der Waals (vdWs) material, has received wide attention in nano-optics for supporting highly confined anisotropic phonon polaritons (PhPs) from the mid-infrared to the terahertz region, which opens a new route for manipulating light at the nanoscale. However, its optical loss hinders light manipulation with high efficiency. This work demonstrates that the isotope-enriched Mo element enables ultralow-loss PhPs in the α-MoO3. Raman spectra reveal that the isotope-enriched Mo element in the α-MoO3 allows different optical phonon frequencies by efficiently altering the Reststrahlen band’s dispersion. The Mo isotope-enriched α-MoO3 significantly reduces the PhPs’ optical loss due to efficient optical coherence, which enhances the propagation length revealed by infrared nanoimaging. These findings suggest that the isotope-enriched α-MoO3 is a new feasible 2D material with an ultralow optical loss for possible high-performance integrated photonics and quantum optics devices.

https://pubs.acs.org/doi/10.1021/acs.nanolett.2c03742

▲ Vol 18 Issue 52 | December 28 , 2022

Ultra-Narrow Linewidth Photo-Emitters in Polymorphic Selenium Nanoflakes

Naveed Hussain, Shehzad Ahmed, Hüseyin U. Tepe, Kai Huang, Nardin Avishan, ShiJie He, Mohsin Rafique, Umar Farooq, Talip Serkan Kasirga, Alpan Bek, Rasit Turan, Khurram Shehzad, Hui Wu, Zhiming Wang

Ultra-Narrow Linewidth Photo-Emitters
In article number 2204302, Khurram Shehzad, Hui Wu, Zhiming Wang, and co-workers report that hot-pressing bulk Selenium into nanoflakes induces structural changes in the Selenium lattice, which leads to ultra-narrow bandwidth photoemission with full width at half maximum of 330 ± 90 μeV, an order of magnitude narrower than the other 2D materials at 300 K.

https://onlinelibrary.wiley.com/doi/10.1002/smll.202270283

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静远嘲风（MY Scimage） 成立于2007年，嘲风取自中国传统文化中龙生九子，子子不同的传说，嘲风为守护屋脊之瑞兽，喜登高望远；静远取自成语“宁静致远”，登高莫忘初心，远观而不可务远。