Black-phosphorus-based junctions and their optoelectronic device applications

Black phosphorus (BP) has attracted significant attention owing to its unique structure and preeminent photoelectric properties, which can be utilized to create novel junctions. Based on different BP-based junctions, versatile optoelectronic devices have been fabricated and investigated in recent years, providing a fertile library for the characteristics of BP-based junctions and their optoelectronic applications. This review summarizes diverse BP-based junctions and their optoelectronic device applications. We firstly introduce the structure and properties of BP. Then, we emphatically describe the formation, properties, and optoelectronic device applications of the BP-based junctions including heterojunctions of BP and other two-dimensional (2D) semiconductors, BP p–n homojunctions, and BP/metal Schottky junctions. Finally, the challenge and prospect of the development and application of BP-based junctions are discussed. This timely review gives a snapshot of recent research breakthroughs in BP-based junctions and optoelectronic devices based on them, which is expected to provide a comprehensive vision for the potential of BP in the optoelectronic field.