The oxygen vacancy (VO) engineering is proved to be an effective approach for improving the hydrogen evolution reaction (HER) performance of low-cost metal oxides electrocatalysts. Cerium dioxide (CeO2), one of...

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The bottom-up preparation of two-dimensional material micro-nano structures at scale facilitates the realisation of integrated applications in optoelectronic devices. Fibrous Phosphorus (FP), an allotrope of black phosphorus (BP), is one of the most promising candidate materials in the field of optoelectronics with its unique crystal structure and properties. [1] However, to date, there are no bottom-up micro-nano structure preparation methods for crystalline phosphorus allotropes. [1c, 2] Herein, we present the bottom-up preparation of fibrous phosphorus micropillar (FP-MP) arrays via a low-pressure gas-phase transport (LP-CVT) method that controls the directional phase transition from amorphous red phosphorus (ARP) to FP. In addition, self-powered photodetectors (PD) of FP-MP arrays with pyro-phototronic effects achieved detection beyond the band gap limit. Our results provide a new approach for bottom-up preparation of other crystalline allotropes of phosphorus.

The model system of the InGaN/GaN quantum wells (QWs), based on the first principles calculation, was chosen to understand the underlying mechanism of interfacial polarization and its synergic effect with the built-in electric field (B ef ) at the p−n junction in solar cells (SLs). The polarized electric field (P ef ) was generated due to the redistribution of electrons and holes at the interface; moreover, the P ef of InGaN/GaN heterostructure on the semipolar (01-11) GaN surface was consistent with that of on the N-polar (000-1) surface, which is on the lines of the B ef and favors the electron−hole separation efficiency in SLs. Furthermore, the growth of high-quality InGaN/GaN QWs on the semipolar (01-11) GaN surface was achieved. Such an atomic-scale investigation provides a fundamental understanding of the polarization chargeinduced P ef and its interaction coupling with B ef at the p−n junction, which could be generalized to polar material-based SLs.

The bottom‐up preparation of two‐dimensional material micro‐nano structures at scale facilitates the realisation of integrated applications in optoelectronic devices. Fibrous Phosphorus (FP), an allotrope of black phosphorus (BP), is one of the most promising candidate materials in the field of optoelectronics with its unique crystal structure and properties.[1] However, to date, there are no bottom‐up micro‐nano structure preparation methods for crystalline phosphorus allotropes.[1c, 2] Herein, we present the bottom‐up preparation of fibrous phosphorus micropillar (FP‐MP) arrays via a low‐pressure gas‐phase transport (LP‐CVT) method that controls the directional phase transition from amorphous red phosphorus (ARP) to FP. In addition, self‐powered photodetectors (PD) of FP‐MP arrays with pyro‐phototronic effects achieved detection beyond the band gap limit. Our results provide a new approach for bottom‐up preparation of other crystalline allotropes of phosphorus.