摘要： High-purity monocrystalline silicon has a long history in development of photovoltaics and so far has dominated the modern computers with its profound implementations in transistors and chips. The success of silicon has shown that monocrystalline wafers/thin films of semiconducting materials which have superior electronic properties are good platform for these optoelectronic and electronic applications. Recently, the newly emerging semiconducting materials of halide perovskites (HPs) have attracted much attention owing to their continuing success in high-efficiency solar cells. Demonstrated optoelectronic properties of HPs indicate that it could be a promising alternative to the silicon-based semiconducting industry. While the prerequisite of high-efficiency device is the material accessibility of monocrystalline HPs (mono-HP), as can be learned from the lessons of monocrystalline silicon. Current HPs based technologies, in terms of research areas like solar cells, photodetectors, light-emitting diodes (LEDs), lasers and transistors, are bottlenecked in manufacturing the mono-HP wafer/thin film materials, hence lacking exciting results of mono-HP devices. The state-of-the-art optoelectronic HP based devices are exclusively built using polycrystalline thin films, which are limited in their performance due to issues such as grain boundary defects, large trap-density and inhomogeneous charge transport. However, these issues can be resolved by utilizing mono-HPs. In this review, we will manifest in-depth analyses and discussions on the potential of mono-HPs in photovoltaics and transistor applications, and present the remaining challenges as well as promising research strategies to provide direction for future programs.