Phenyl-Terminated Coupling Interface Enabled Highly Efficient and Stable Multiwavelength Perovskite Single Crystal/Silicon Integrated Photodetector

Abstract

The use of amino-terminated siloxanes as coupling interface for perovskite single crystals (PSCs)/silicon integrated devices has been demonstrated to be an effective method toward CMOS compatible optoelectronics; however, it suffers from the coupling stability against the hydrophilicity of the exposed terminal amino groups. In this work, a phenyl-terminated interfacial molecule, anilino-methyl-triethoxysilane (AMTES), is proposed to achieve the effectively galvanic coupling between PSCs and silicon, which can not only improve the device environmental reliability but also lower the surface energy of the silicon substrate so as to facilitate the epitaxial growth of PSCs. Benefiting from the interfacial coupling of AMTES, the obtained MAPbI3 SC/silicon integrated device possesses highly efficient multiwavelength photodetection properties across the X-ray and NIR range, which exhibits a specific detectivity D* of 3.84 × 1013 cm Hz1/2 W–1 in the visible-NIR region and an X-ray sensitivity of 1.18 × 104 μC Gyair –1 cm–2 with the lowest detection limit of 49.6 nGyair s–1. The ultra wide −3 dB bandwidth of 67,300 Hz and the linear dynamic range (LDR) of 112 dB also prove its impressive dynamic response capabilities. Moreover, the AMTES modified integrated device almost maintains 96% of the initial photodetection performance even after keeping in the atmosphere environment for 28 days. This work opens a new avenue for interfacial engineering toward the development of on-chip PSC integrated silicon optoelectronic devices.

Preferably Oriented Growth of Methylammonium-Based Perovskite Single Crystals with Ionic Liquid Solvent

“…Depending on the rapid progress of metallic halide perovskites with ABX 3 chemical constitution in the past decade, solution-grown perovskite single crystals (PSCs) without grain boundary provide an ideal material prototype for studying the intrinsic physicochemical properties and possess superior crystalline stability in comparison with polycrystal and nanocrystal forms. − From the perspective of lattice stability, only Goldschmidt’s tolerance factor τ resting with the ionic radius of perovskite components located between 0.9 and 1.0 is generally viewed as a good fit for perovskites, indicating the likelihood of highly symmetric cubic structures at normal pressure and temperature. − Regarding the most attractive iodide PSCs, like MAPbI 3 , the stable structure is found to be tetragonal phase between 165 and 327 K. − Owing to the intrinsic otherness of the tetragonal crystal structure along different directions, the optoelectronic properties of MAPbI 3 single crystals is anisotropic as well. − Conventionally, solution-grown MAPbI 3 single crystals in γ-butyrolactone (GBL) solvent usually expose (100), (010), and (112) facets in a rhombic dodecahedron shape, yet the theoretical calculation and experimental verification reveal the [001] crystalline direction indeed possesses a superior absorption coefficient, carrier dynamic, and the like . Therefore, regulation of the crystal orientation of PSCs plays a role of critical significance toward optoelectronic device applications.…”