High-Performance Near-Infrared Photodetectors Based on the Synergy Effect of Short Wavelength Light Filter and Long Wavelength Response of a Perovskite/Polymer Hybrid Structure

Abstract

Near-infrared photodetectors (NIR-PDs) are widely used in communications, biomedical imaging, and national defense. Here we report a new strategy to prepare a short wavelength light filter based NIR-PDs by introducing an interface layer between the perovskite layer and the polymer layer to achieve the selective passage of carriers. Through the synergistic effect of the perovskite and the interface layer, the short wavelength light component in the signal spectrum is effectively filtered out. The organic polymer layer with a bulk heterojunction structure is applied to realize the absorption and conversion of near-infrared light. The prepared device achieves a maximum external quantum efficiency of 83.7% without bias, a high specific detectivity of 1.52 × 1013 Jones, an NIR responsivity of 0.577A/W, and a short response time of 1.73/0.97 μs within the detection range from 770 to 900 nm. All these properties show great advantages compared with other perovskite/polymer hybrid NIR photodetectors that have been reported. This innovative strategy provides a new way to prepare high-performance near-infrared photodetectors.

Vitality surveillance at distance using thin-film tandem-like narrowband near-infrared photodiodes with light-enhanced responsivity

“…1C). A similar strategy has been reported before (39). The narrowband EQE spectrum is thus the effect of the photocurrent generated in the BHJ because of the longer wavelength absorption of the incident light.…”

“…For instance, NIR-sensitive PDs have been demonstrated by blending narrow-bandgap polymers in bulk heterojunctions (BHJs) (21)(22)(23) or by introducing tin (Sn) in lead halide perovskites (24)(25)(26)(27). PDs with narrow or multiwavelength responsivity have been achieved without the use of optical filters, by using narrowband organic (28)(29)(30)(31) and perovskite absorbers (32), by using the antibatic responsivity of thick active layers (33)(34)(35)(36), or by constructing hybrid perovskite/organic hierarchical structures that self-filter parts of the visible spectrum (37)(38)(39)(40).…”

Quasi-Tandem Photodetector with Tunable Narrowband Response and Submicrosecond Response Time: Charge-Selected Transmitting Narrowing

“…Instead, it specifically impedes the transportation of photo-generated electrons present in the perovskite subcell. The process of transportation of holes from the organic heterojunction to the anode remains unaffected . The band alignment and the schematic illustration of the carrier transport are shown in Figure S6.…”

“…The process of transportation of holes from the organic heterojunction to the anode remains unaffected. 35 The band alignment and the schematic illustration of the carrier transport are shown in Figure S6. Single carrier devices, with a structure of ITO/SnO 2 /MAPbI 3 / PFN (with and without)/PM6:IT-4F/BCP/Ag and a structure of ITO/PEDOT:PSS/MAPbI 3 /PFN (with and without)/ PM6:IT-4F/MoO 2 /BCP/Ag, were fabricated to test the electron-only and hole-only current response of the materials under external reverse bias, respectively.…”

X-Graphene Quantum Dot/PbX (X = S, Se) Hybrid Nanostructures for Self-Powered Two-Color UV-NIR Photodetectors

“…Infrared (IR) photodetectors are indispensable for various applications, including night vision, military missile tracking, medical imaging, industrial defect imaging, environmental sensing, and astrophysics . Conventional semiconductor fabrication techniques, such as mercury cadmium telluride (HgCdTe) and III–V material-based photodetectors, − have dominated the market for many years.…”