Ya-Hsiang Tai;Chih-Chung Tu;Chi-Hao Lin;Chi-Fan Lu
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Reliability of Gap-Type Thin Film Transistors Under Low Illumination for Imaging Sensing Applications
In large-area image sensing applications, such as under-display fingerprint sensors, amorphous silicon (a-Si) gap-type thin-film transistors (TFTs) are favored due to their simple fabrication process and high sensing current. These applications typically involve device operation under low-light illumination conditions. Despite these advantages, the recovery behavior of performance parameters after exposure to stress factors, including bias stress and photo-stress, has not been comprehensively explored, particularly in relation to reliability recovery. This study systematically investigates the impact of fixed-bias and pulsed-stress operations under low-light conditions. The experimental findings are further analyzed using Technology Computer-Aided Design (TCAD) simulations to elucidate the underlying mechanisms. Results indicate that long-term bias stress induces significant variations in the photocurrent characteristics of the devices. However, the introduction of pulsed operations in sensing applications markedly enhances the operational lifetime of the devices, offering a promising pathway to improving their reliability.
期刊介绍:
The IEEE Journal of the Electron Devices Society (J-EDS) is an open-access, fully electronic scientific journal publishing papers ranging from fundamental to applied research that are scientifically rigorous and relevant to electron devices. The J-EDS publishes original and significant contributions relating to the theory, modelling, design, performance, and reliability of electron and ion integrated circuit devices and interconnects, involving insulators, metals, organic materials, micro-plasmas, semiconductors, quantum-effect structures, vacuum devices, and emerging materials with applications in bioelectronics, biomedical electronics, computation, communications, displays, microelectromechanics, imaging, micro-actuators, nanodevices, optoelectronics, photovoltaics, power IC''s, and micro-sensors. Tutorial and review papers on these subjects are, also, published. And, occasionally special issues with a collection of papers on particular areas in more depth and breadth are, also, published. J-EDS publishes all papers that are judged to be technically valid and original.