Efficient Carrier Transport in 2D BiOSe/CsBiI Perovskite Heterojunction Enables Highly-Sensitive Broadband Photodetection.

2D BiOSe has recently garnered significant attention in the electronics and optoelectronics fields due to its remarkable photosensitivity, broad spectral absorption, and excellent long-term environmental stability. However, the development of integrated BiOSe photodetector with high performance and low-power consumption is limited by material synthesis method and the inherent high carrier concentration of BiOSe. Here, a type-I heterojunction is presented, comprising 2D BiOSe and lead-free bismuth perovskite CsBiI, for fast response and broadband detection.

Achieving Ultrahigh Capacity with Self-Assembled Ni(OH) Nanosheet-Decorated Hierarchical Flower-like MnCoO Nanoneedles as Advanced Electrodes of Battery-Supercapacitor Hybrid Devices.

Self-assembled Ni(OH) nanosheet-decorated hierarchical flower-like MnCoO nanoneedles were synthesized via a cost-effective and facile hydrothermal strategy, aiming to realize a high-capacity advanced electrode of a battery-supercapacitor hybrid (BSH) device. It is demonstrated that the as-synthesized hierarchical flower-like MnCoO@Ni(OH)-nanosheet electrode exhibits a high specific capacity of 318 mAh g at a current density of 3 A g and still maintains a capacity of 263.5 mAh g at a higher current density of 20 A g, with an extremely long cycle lifespan of 87.