An Antimony Selenide Molecular Ink for Flexible Broadband Photodetectors

Abstract

The need for low-cost high-performance broadband photon detection with sensitivity in the near infrared (NIR) has driven interest in new materials that combine high absorption with traditional electronic infrastructure (CMOS) compatibility. Here, we demonstrate a facile, low-cost and scalable, catalyst-free one-step solution-processed approach to grow one-dimensional Sb2Se3 nanostructures directly on flexible substrates for high-performance NIR photodetectors. Structural characterization and compositional analyses reveal high-quality single-crystalline material with orthorhombic crystal structure and a near-stoichiometric Sb/Se atomic ratio. We measure a direct band gap of 1.12 eV, which is consistent with predictions from theoretical simulations, indicating strong NIR potential. The fabricated metal-semiconductor-metal photodetectors exhibit fast response (on the order of milliseconds) and high performance (responsivity ~ 0.27 A/W) as well as excellent mechanical flexibility and durability. The results demonstrate the potential of molecular-ink-based Sb2Se3 nanostructures for flexible electronic and broadband optoelectronic device applications.

The Highly Uniform Photoresponsivity from Visible to Near IR Light in Sb2Te3 Flakes

“…These reports show that the observed photocurrent is strongly dependent on light wavelength, which would limit the application potential of the broadband light sensor. Advancing the findings of previous reports, our experimental results reveal that the photocurrent is weakly wavelength dependent [ 10 , 15 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ]. The α roughly deviates by 30% at the three different wavelengths, which is much smaller than the reported values.…”

“…This characteristic is more flexible and stable for a wide range of potential applications. The broadband light response has been observed in many low-dimensional systems [ 10 , 15 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ]. These reports show that the observed photocurrent is strongly dependent on light wavelength, which would limit the application potential of the broadband light sensor.…”

Kinetics and mechanistic details of bulk ZnO dissolution using a thiol–imidazole system

“…13 In the same way, compositionally controlled alloyed semiconductors can be solution processed by tuning the ink formulation. 5,11 The alkahest solvent system returns functional thin lms that have proven useful in a multitude of applications, including solar cells, 17,18 photodetectors, 19 thermoelectrics, 20 neuromorphic devices, 21 electrocatalysts, 22 and it has also been used to engineer the surfaces of colloidal nanocrystals. [23][24][25] This approach has the potential to be translated to large-scale solution processing.…”

High-Crystallinity Epitaxial Sb2Se3 Thin Films on Mica for Flexible Near-Infrared Photodetectors

“…The van der Waals interactions between the ribbons enable the c-axis-oriented grain boundaries to be free of dangling bonds and can reduce the recombination losses . Because of these excellent properties, Sb 2 Se 3 has presented potential applications in photovoltaics, − , photodetectors, − photocatalysis, − and electrochemistry . However, there are challenges for developing these devices because the device performance is very sensitive to defects, such as dislocations, grain boundaries, and strains .…”