A UV to NIR Si Wavelength Sensor With Simple Geometry and Good Resolution

Fu, Can; Lü, Chuan; Cheng, H. P.; Zhang, Xiang; Zhang, Zhixiang; Xiao, Yu-Tian; Lin, Di‐Hua; Wang, Jiang; Hu, Jigang; Wang, Zhili; Wu, Di; Luo, Lin‐Bao

doi:10.1109/ted.2022.3161253

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…Miniaturized spectrometers with advantages of portability and low cost and power consumption have attracted much attention due to their potential in advanced application scenarios, including wearable devices, hyperspectral imaging, and internet of things. − Computational spectrum reconstruction based on a series of response-modulated photodetectors with a gradient bandgap is one of the most promising methods for achieving such miniaturized spectroscopy systems. − For instance, Yang et al successfully demonstrate a miniaturized spectrometer at the scale of tens of micrometers using a single compositionally graded CdS x Se 1– x nanowire . Recently, halide perovskites have also been used in photodetectors for human visual-like spectrum projection, full-color detection, and multispectral recognition owing to their outstanding properties such as facile solution-process fabrication, excellent light harvesting coefficients, and tunable bandgaps. − Xu et al demonstrated a miniaturized multispectral detector based on a composition-gradient perovskite microwire detector array, offering a response edge ranging from 450 to 790 nm .…”

Section: Introductionmentioning

confidence: 99%

Flexible Microspectrometers Based on Printed Perovskite Pixels with Graded Bandgaps

Huang

Chen

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Miniaturized spectrometers have attracted much attention due to their capability to detect spectral information within a small size. However, such technology still faces challenges including large-scale preparation and performance repeatability. In this work, we overcome these challenges by demonstrating a microspectrometer constructed with a series of pixelized graded-bandgap perovskite photodetectors fabricated with inkjet printing. High-quality perovskite films with minimal pinholes and large grains are deposited by optimizing printing conditions including substrate temperature and surface modification. The resulting perovskite photodetectors show decent photosensing performance, and the different photodetectors based on perovskite films with different bandgaps exhibit various spectral responsivities with different cutoff wavelength edges. Microspectrometers are then constructed with the array of the pixelized graded-bandgap perovskite photodetectors, and incident spectra are algorithmically reconstructed by combining their output currents. The reconstruction performance of the miniaturized spectrometer is evaluated by comparing the results to the spectral curve measured with a commercial bulky spectrometer, indicating a reliable spectral reconstruction with a resolution of around 10 nm. More significantly, the miniaturized spectrometers are successfully fabricated on polymer substrates, and they demonstrate excellent mechanical flexibility. Therefore, this work provides a flexible miniaturized spectrometer with large-scale fabricability, which is promising for emerging applications including wearable devices, hyperspectral imaging, and internet of things.

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Section: Introductionmentioning

confidence: 99%

Flexible Microspectrometers Based on Printed Perovskite Pixels with Graded Bandgaps

Huang

Chen

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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“…The stacked Si detectors reported a high resolution of 1 nm for wavelength. [ 18 ] And a wide‐range detection from UV to NIR region (265–1550 nm) has been presented in the stack of two junctions based on monolayer graphene (MLG)/ thin Si single‐crystalline film/MLG and MLG/Ge wafer. [ 19 ] It should be noticed that the photocurrent ratio of two detectors changes as incident light intensity varies in these systems.…”

Section: Introductionmentioning

confidence: 99%

Vertically Stacked Transparent Organic Photodetectors for Light Intensity‐Independent Wavelength Recognition

Song,

Jiang,

Liu

2023

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Wavelength recognition is one of the important functions of photodetectors. However, wavelength recognition of the reported photodetectors generally depends on light intensity, which limits the practical applications. Here, a light intensity‐independent wavelength recognition scheme based on vertically stacked transparent photodetectors is reported. By analyzing light intensity attenuation behavior in the multiple stacked photodetectors, the wavelength of incident light can be accurately determined. Due to the high transparency of the detectors, the multiple stacked detectors allow incident light to pass through. Meanwhile, since the attenuation coefficients at different wavelengths are attributed to the detector's absorption characteristics, the intensity of incident light and its wavelength can be determined by analyzing the attenuation coefficients measured through each stacked detector. Consistent wavelength values obtained at different light intensities verify the light intensity‐independence of the multistacked detector system.

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High‐Performance Flexible PbS Nanofilm Wavelength Sensor with Detection Region Ranging from DUV to NIR

Liang,

Hu,

Zhu

et al. 2024

Adv Materials Technologies

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In this study, on the fabrication of a flexible wavelength sensor is reported, which is achieved by growing a layer of lead sulfide (PbS) nanofilm on both sides of a polyethylene terephthalate substrate using the chemical bath deposition method, followed by the deposition of two parallel Au interdigital electrodes. Experimental result shows that the photocurrent ratio of the two photodetectors monotonically decreases with increasing wavelength in the range from 265 nm (UV) to 2000 nm (NIR), indicating that the incident light wavelength can be distinguished by the photocurrent ratio. Notably, the as‐constructed wavelength sensor exhibits superior performance compared to most previously reported filter‐less designs, achieving an average absolute error of 11.5 nm and an average relative error of 1.1%. It is also found that the sensor exhibits excellent mechanical flexibility and environmental stability. Furthermore, by introducing the back‐end circuit, real‐time detection of the wavelength of monochromatic light and the peak wavelength of LED light are achieved, with detection errors not exceeding 2.8% and 2.6%, respectively. It is believed that the flexible PbS nanofilm wavelength sensor prepared in this study has potential application in future portable and flexible optoelectronic devices.

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A UV to NIR Si Wavelength Sensor With Simple Geometry and Good Resolution

Cited by 5 publications

References 22 publications

Flexible Microspectrometers Based on Printed Perovskite Pixels with Graded Bandgaps

Flexible Microspectrometers Based on Printed Perovskite Pixels with Graded Bandgaps

Vertically Stacked Transparent Organic Photodetectors for Light Intensity‐Independent Wavelength Recognition

High‐Performance Flexible PbS Nanofilm Wavelength Sensor with Detection Region Ranging from DUV to NIR

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