Monolithically Integrated PbS Colloidal Quantum Dot Photodetector Crossbar Array for Short‐Wavelength Infrared Imaging

Monolithically integrated pixels, with stacked PbS colloidal quantum dot (CQD) photodiodes and organic blocking diodes, are developed as the building block for constructing a short‐wavelength infrared (SWIR) crossbar imaging array. Arising from the back‐to‐back stacked configuration and a favorable...

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Bibliographic Details
Published in:Advanced optical materials 2023-07, Vol.11 (14), p.n/a
Main Authors: Jiang, Meng‐Ting, Yang, Qian, Xu, Jian‐Long, Yuan, Yu, Zhang, Jing‐Yue, Zhong, Ya‐Nan, Gao, Xu, Wang, Sui‐Dong
Format: Article
Language:English
Subjects:
Arrays
Blocking
crossbar array
electrical crosstalk
Energy levels
Infrared imaging
Materials science
monolithic integration
Optics
PbS quantum dots
Photodiodes
Pixels
Power consumption
Power management
Quantum dots
SWIR imaging
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Summary:Monolithically integrated pixels, with stacked PbS colloidal quantum dot (CQD) photodiodes and organic blocking diodes, are developed as the building block for constructing a short‐wavelength infrared (SWIR) crossbar imaging array. Arising from the back‐to‐back stacked configuration and a favorable energy level alignment, holes are blocked from the photodiode at zero and forward biases, which results in the normally‐OFF behavior of the pixels. Based on such device characteristics, the monolithically integrated pixels can effectively suppress electrical crosstalk under illumination in the crossbar array and consume nearly zero standby power. Furthermore, an 8×8 crossbar imaging array with both high imaging quality and low power consumption is achieved, which features as a high‐performance visible–SWIR imaging sensor. This work demonstrates a monolithically integrated pixel structure, with stacked PbS colloidal quantum dot photodiode and organic blocking diode, for building a short‐wavelength infrared (SWIR) crossbar imaging array. The pixels are realized by engineering the stack configuration, utilized to achieve high‐quality SWIR imaging with minimized electrical crosstalk among the pixels and almost zero standby power.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202202990