Recent progress in 2-dimensional organic–inorganic heterojunction optoelectronic devices

Emerging 2D heterojunction materials, especially organic-inorganic heterjunctions, combine high-performance inorganic materials with a wide range of organic semiconductors, showing good optoelectronic properties and scalability. These heterojunctions offer excellent flexibility and are ideal platforms for realizing various functional applications. Based on this, this paper reviews the domestic and international research progress based on organic-inorganic heterojunctions in optoelectronic devices, which can help to realize the development and application of multifunctional in multifunctional devices, and then summarize the common preparation methods of organic-inorganic heterojunctions. Subsequently, we delved into the multifunctional device applicaitons of organic-inorganic-heterojunctions in electronic devices, molecular swithes, photodetectors, memory devices, neuromorphic devices, and flexible devices, respectively. Finally, we deleve into the key challenges and future perspectives of organic-inorganic heterojunctions in optoelectronic device research. 

This review begins with an overview of developments in the field of two-dimensional inorganic-organic heterojunctions, describing various configurations, materials, and prototype assembley methods. The report then delves into the application of heterostructures in a range of multifaceted devices, invcluding electronic modules, molecular bistable devices, photonic sensors, data storage devices, neuromorphic computing systems, and flexible electronic frameworks. Notably, these heterostructures exhibit enhanced functionality beyond that of their discrete components, suggesting that the fusion of organic and inorganic matter heralds a burgeoning field of multifunctional instrumentation fabrication. Despite the great strides made in the fields of heterostructure synthesis, device engineering, interface analysis, and electronics and optoelectronics, there are still enormous challenges to overcome. On the one hand, the charge transport mechanism at the interface of organic-inorganic heterostructures is still unclear and needs to be further investigated experimentally or by theoretical calculations to explain the complex interactions in inorganic-organic heterostructures. On the other hand, atomically planar two-dimensional inorganic materials can be used as building blocks for organic crystal growth, which is important for the preparation of high-performance devices in various electronic fields, and thus there is an urgent need to develop large-scale, defect-poor, and low-cost synthesis methods for the efficient growth of organic materials with high crystal structures. The prospect of wide application of organic-inorganic heterojunctions has inspired great enthusiasm for fundamental research and is a comprehensive test of the multidisciplinary pratice of this technology. We believe that inorganic-organic heterojunctions are promising and can open up new areas for complex applications in multifunctional optoelectronic devices, electrocatalysis, and other fields.