Recent progress and strategies in photodetectors based on 2D inorganic/organic heterostructures

Abstract

Two-dimensional (2D) inorganic/organic heterostructures have attracted great attention in the field of optoelectronics due to their unique properties. Comparing with purity organic semiconductors or 2D inorganic heterostructures, the 2D inorganic/organic heterostructure overwhelms the current limitations of photodetectors and provides more opportunities for the optoelectronic field. However, no in-depth reviews on the important progresses, challenges, and optimizing strategies of performance of photodetectors based on 2D inorganic/organic heterostructures are found in literatures to date. Herein, this report firstly introduces unique features of 2D inorganic/organic heterostructures. Then, we sum up the main growing methods according to the technological principle, and the main properties of photodetectors, and summarize the progresses of photodetectors of 2D inorganic-organic heterostructures based on different physical mechanisms (mainly as photovoltaic effect and photoconductive effect). More importantly, this report presents some design strategies for optimizing photodetector performance of 2D inorganic-organic heterostructures, especially introducing 2D organic ultrathin film design strategy. Furthermore, future challenges and opportunities of 2D inorganic-organic heterostructures are highlighted.

Ti3C2Tx MXene‐RAN van der Waals Heterostructure‐Based Flexible Transparent NIR Photodetector Array for 1024 Pixel Image Sensing Application

“…Organic photosensitive materials with controlled thickness, superior flexibility, and high transmittance can easily attain uniform coverage in target areas and cooperate with conductive electrodes to fulfill the procedure of regional highly transparent device arrays. [11][12][13][14] Moreover, the existence of large electronegative N and O atoms in some organic photosensitive materials provide suitable conditions for the formation of noncovalent bonds. Looking for a specific conductive electrode that offers the formation possibility of heterostructure and noncovalent bonds with the active material could accelerate the separation of electron and hole, optimize and raise the performance of the material itself, in the meantime, make the two parts become more tightly.…”

Engineering sensitivity and spectral range of photodetection in van der Waals materials and hybrids

“…Successful development of thin film organic photodetectors (OPDs) faces major challenges such as short exciton diffusion lengths (of the order of few nanometers), low carrier mobility and poor photoresponse beyond NIR wavelengths [117,118]. Studies have demonstrated improved photosensitivity and high detector gain by integrating organic compounds with 2D vdW materials [119]. Here, the organic semiconductor acts as a tunable bandgap photoactive material, and the vdW material is used as a high-quality substrate with high mobility and an ideal interface for fast charge carrier transportation.…”

Recent Progress in 2D Inorganic/Organic Charge Transfer Heterojunction Photodetectors

“…[30,31] The early CT 2D inorganic/organic planar or vertical P-N junctions were directly performed to increase the efficiency of dissociation and enlarge the gain for high responsivity (upper left of Figure 1). [32,33] Besides, two trade-off tendencies were suggested. First, the thick film indeed promotes the responsivity, but the exciton far from the interface is hard to drift into channel.…”

“…[41,42] Nevertheless, the majority of the present 2D inorganic/ organic CT works cover from UV to visible (VIS) but even hard to contain the full communication window. [32,33] As for longwave detection, efforts were done respectively in 2D and organic. [43] The high-performance longwave 2D detections have been investigated by using black phosphorus (b-P) [44,45] and black arsenic phosphorus (b-AsP), [46,47] further incorporated with waveguide, [48] Figure 1.…”