Flexible Miniaturized Multispectral Detector Derived from Blade-Coated Organic Narrowband Response Unit Array

Abstract

Multispectral sensing is extremely desired in intelligent systems, e.g., autonomous vehicles, encrypted information communication, and health biometric monitoring, due to its highly sensitive spectral discrimination ability. Nevertheless, rigid bulky optics and delicate optical paths in devices significantly increase their complexity and size, which subsequently impede their integration in smart optoelectronic chips for universal applications. In this work, a filterless miniaturized multispectral photodetector is realized with an organic narrowband response unit array. With the manipulation of Frenkel exciton dissociation in active layers, a series of narrowband organic sensing units with full-width-at-half-maximum (fwhm) narrowing to ∼50 nm are achieved from 700 to 1050 nm with a laudable performance of responsivity of over 60 mA/W, −3 dB bandwidth over 10 kHz, linear dynamic range (LDR) reaching ∼120 dB, and a low noise current of less than 4 × 10–14 A·Hz–0.5. Furthermore, a 6 × 8 multispectral sensing array on a flexible substrate was fabricated with blade-coating. Assisted by a computational process, we successfully demonstrate the spectral recognition with a resolution of ∼50 nm and a mismatch of ∼10 nm. Finally, the function of matter identification is successfully achieved with our multispectral detector array.

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

“…where λ is the wavelength of light, h is the Planck constant, c is the speed of light, A is the working area of the device, B is the bandwidth, i n is the noise, and R denotes responsivity. 34 A high D* value (>10 12 Jones) was recorded for the developed QT-NPDs (Figure 2e), and this confirmed that the detectors could potentially be used to detect weak signals. Furthermore, the LDR, defined as the range of incident light power where the photocurrent is linearly proportional to irradiance, was determined for the QT-NPDs.…”

“…Currently, single-junction devices are primarily used to realize narrowband detection. − Armin et al and Lin et al independently proposed narrowband PDs based on the charge collect narrowing (CCN) strategy using organics or perovskite materials. Thick photo-active layers are used to regulate the optical field and carrier behavior of the devices fabricated based on the CCN strategy.…”

Emerging Computational Micro‐Spectrometers — From Complex System Integration to Simple In Situ Modulation

“…The strong data processing software capabilities compensate for potential compromises in device performance arising from reduced hardware sizes. Table 1 , [ 16,19,24–26 ] Table 2 , [ 27–33 ] Table 3 , [ 15,34–66 ] and Table 4 [ 67–71 ] compare the performance indicators such as footprint, spectrum range and resolution of spectrometers based on conventional, mapping of spectrum to space, spectrum response modulation, and single detector strategies, respectively. Although miniaturized spectrometers based on spectrum‐to‐space mapping strategy generally achieve spectrum resolution comparable to conventional spectrometers, their footprints still cannot meet the miniaturization requirements.…”

Design of dual-band spectral response Cu2O/TiO2 heterojunction photodetector

“…Multispectral photoelectric detection has attracted much attention because of its ability to detect multiple bands, and has potential application prospects in the fields of imaging, remote sensing, missile early warning and encrypted communications [1][2][3][4] . However, the intrinsic absorption limit of a single material limits the detection range of PDs.…”