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한국센서학회> 센서학회지> 졸-겔 공법으로 제작된 SnO2 박막 트랜지스터의 광전기적 특성

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졸-겔 공법으로 제작된 SnO2 박막 트랜지스터의 광전기적 특성

Optoelectronic Properties of Sol-gel Processed SnO2 Thin Film Transistors

이창민 ( Changmin Lee ) , 장재원 ( Jaewon Jang )
  • : 한국센서학회
  • : 센서학회지 29권5호
  • : 연속간행물
  • : 2020년 09월
  • : 328-331(4pages)
센서학회지

DOI


목차

1. 서 론
2. 연구 방법
3. 결과 및 고찰
4. 결 론
감사의 글
REFERENCES

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초록 보기

In this study, a highly crystalline SnO2 thin film was formed using a sol-gel process. In addition, a SnO2 thin-film transistor was successfully fabricated. The fabricated SnO2 thin-film transistor exhibited conventional n-type semiconductor properties, with a mobility of 0.1 cm2 V-1 s-1, an on/off current ratio of 1.2 × 105, and a subthreshold swing of 2.69. The formed SnO2 had a larger bandgap(3.95 eV) owing to the bandgap broadening effect. The fabricated photosensor exhibited a responsivity of 1.4 × 10-6 Jones, gain of 1.43 × 107, detectivity of 2.75 × 10-6 cm Hz1/2 W-1, and photosensitivity of 4.67 × 102.

UCI(KEPA)

I410-ECN-0102-2021-500-001328631

간행물정보

  • : 공학분야  > 전기공학
  • : KCI등재
  • :
  • : 격월
  • : 1225-5475
  • : 2093-7563
  • : 학술지
  • : 연속간행물
  • : 1992-2021
  • : 1875


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Here, we studied the change in the mechanical stiffness of a diaphragm according to the corrugation pattern. The diaphragm consists of a silicon oxide and nitride double layer; a corrugation pattern was formed by dry etching, and the diaphragm was released by wet etching. The fabrication of the thin film was verified using focused ion beam and scanning electron microscopy images. The mechanical stiffness of the diaphragm was obtained by measuring the surface vibration using a laser Doppler vibrometer while applying external sound pressure. Flat squares, diaphragms with square corrugations, and circular corrugation patterns were measured and compared. The stiffness of the diaphragm with a corrugation structure was found to be smaller than that without a corrugation structure; in particular, circular corrugation showed a better effect because of the high symmetry. Furthermore, the effect of corrugation was theoretically predicted. The proposed corrugated diaphragm showed comparable flexibility with the state-of-the-art MEMS microphone diaphragm.

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발행기관 : 한국센서학회 간행물 : 센서학회지 30권 5호 발행 연도 : 2021 페이지 : pp. 279-285 (7 pages)

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Recently, cesium tellurium iodine (Cs2TeI6) has emerged as an inorganic halide perovskite material with potential application in optoelectronic devices due to its high absorption coefficient, suitable bandgap and because it consists of nontoxic and earth-abundant elements. However, studies on its fabrication process as well as photoresponse characteristics are limited. In this study, a simple and effective method is introduced for the synthesis of Cs2TeI6 thin films by a two-step dry process. A Cs2TeI6-based lateral photosensor was fabricated, and its photoresponse characteristics were explored under laser illuminations of four different wavelengths in the visible range: 405, 450, 520, and 655 nm. The initial photosensing results suggest potential application and can lead to more promising studies of Cs2TeI6 film in optoelectronics.

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발행기관 : 한국센서학회 간행물 : 센서학회지 30권 5호 발행 연도 : 2021 페이지 : pp. 286-289 (4 pages)

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Image classification is one of the fundamental applications of computer vision. It enables a system to identify an object in an image. Recently, image classification applications have broadened their scope from computer applications to edge devices. The convolutional neural network (CNN) is the main class of deep learning neural networks that are widely used in computer tasks, and it delivers high accuracy. However, CNN algorithms use a large number of parameters and incur high computational costs, which hinder their implementation in edge hardware devices. To address this issue, this paper proposes a lightweight image classifier that provides good accuracy while using fewer parameters. The proposed image classifier diverts the input into three paths and utilizes different scales of receptive fields to extract more feature maps while using fewer parameters at the time of training. This results in the development of a model of small size. This model is tested on the CIFAR-10 dataset and achieves an accuracy of 90% using .26M parameters. This is better than the state-of-the-art models, and it can be implemented on edge devices.

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저자 : Amrita Rana , Kyung Ki Kim

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 5호 발행 연도 : 2021 페이지 : pp. 290-294 (5 pages)

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Experts have designed popular and successful model architectures, which, however, were not the optimal option for different scenarios. Despite the remarkable performances achieved by deep neural networks, manually designed networks for classification tasks are the backbone of object detection. One major challenge is the ImageNet pre-training of the search space representation; moreover, the searched network incurs huge computational cost. Therefore, to overcome the obstacle of the pre-training process, we introduce a network adaptation technique using a pre-trained backbone model tested on ImageNet. The adaptation method can efficiently adapt the manually designed network on ImageNet to the new object-detection task. Neural architecture search (NAS) is adopted to adapt the architecture of the network. The adaptation is conducted on the MobileNetV2 network. The proposed NAS is tested using SSDLite detector. The results demonstrate increased performance compared to existing network architecture in terms of search cost, total number of adder arithmetics (Madds), and mean Average Precision(mAP). The total computational cost of the proposed NAS is much less than that of the State Of The Art (SOTA) NAS method.

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발행기관 : 한국센서학회 간행물 : 센서학회지 30권 5호 발행 연도 : 2021 페이지 : pp. 295-299 (5 pages)

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In this study, we present a complementary metal-oxide-semiconductor (CMOS) binary image sensor. It can shoot an object rotating at a high-speed by using a gate/body-tied (GBT) p-channel metal-oxide-semiconductor field-effect transistor (PMOSFET)-type photodetector. The GBT PMOSFET-type photodetector amplifies the photocurrent generated by light. Therefore, it is more sensitive than a standard N+/P-substrate photodetector. A binary operation is installed in a GBT PMOSFET-type photodetector with high-sensitivity characteristics, and the high-speed operation is verified by the output image. The binary operations circuit comprise a comparator and memory of 1- bit. Thus, the binary CMOS image sensor does not require an additional analog-to-digital converter. The binary CMOS image sensor is manufactured using a standard CMOS process, and its high- speed operation is verified experimentally.

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발행기관 : 한국센서학회 간행물 : 센서학회지 30권 5호 발행 연도 : 2021 페이지 : pp. 300-308 (9 pages)

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Usually, during slaughter, the meat is divided into large chunks by part after deboning. The meat chunks are inspected for the presence of needles with an X-ray scanner. Although needles in the meat chunks are easily detectable, they can also be found in trimmings and meat offals, where meat skins, fat chunks, and pieces of meat from different parts get agglomerated. Detection of needles in trimmings and meat offals becomes challenging because of many needle-like patterns that are detected by the X-ray scanner. This problem can be solved by learning the trimmings or meat offals using deep learning. However, it is not easy to collect a large number of learning patterns in trimmings or meat offals. In this study, we demonstrate the use of deep convolutional generative adversarial network (DCGAN) to create fake images of trimmings or meat offals and train them using a convolution neural network (CNN).

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In this study, biomarkers were analyzed and segmented using tunable infrared gas sensors after performing the principal component analysis. The free spectral range of the device under test (DUT) was around 30 nm and DUT-5580 yielded the highest output voltage property among the others. The biomarkers (isoprophyl alcohol, ethanol, methanol, and acetone solutions) were sequentially mixed with deionized water and their mists were carried into the gas chamber using high-purity nitrogen gas. A total of 17 different mixed gases were tested with three tunable infrared gas sensors, namely DUT-3144, DUT-5580, and DUT-8010. DUT-8010 resolved the infrared absorption spectra of whole mixed gases. Based on the principal component analysis with each DUT and their combinations, each mixed gas and the trends in increasing gas concentration could be well analyzed when the contributions of the eigenvalues of the first and second were higher than 70% and 10%, respectively, and their sum was greater than 90%.

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In this study, body pressure was quantitatively detected using built-in optical sensors, inside an air cushion seat. The proposed system visualizes the effect of the body pressure distribution on the air cushion seat. The built-in sensor is based on the time-of-flight (ToF) optical method, instead of the conventional electrical sensor. A ToF optical sensors is attached to the bottom surface of the air-filled cells in the air cushion. Therefore, ToF sensors are durable, as they do not come in physical contact with the body even after repeated use. A ToF sensor indirectly expresses the body pressure by measuring the change in the height of the air-filled cell, after being subjected to the weight of the body. An array of such sensors can measure the body pressure distribution when the user sits on the air cushion seat. We implemented a prototype of the air cushion seat equipped with 7 ToF optical sensors and investigated its characteristics. In this experiment, the ToF optical pressure sensor successfully identified the pressure distribution corresponding to a sitting position. The data were accessed through a mobile device.

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Current sensors that use a Hall element and Hall IC to measure the magnetic fields generated in steel silicon core gaps do not distinguish between direct and alternating currents. Thus, they are primarily used to measure direct current (DC) in industrial equipment. Although such sensors can measure the DC when installed in expensive equipment, ascertaining problems becomes difficult if the equipment is set up in an unexposed space. The control box is only opened during scheduled maintenance or when anomalies occur. Therefore, in this paper, a method is proposed for facilitating the safety management and maintenance of equipment when necessary, instead of waiting for anomalies or scheduled maintenance. A Bluetooth 4.0 low-energy current-sensor system based on near-field communication is used, which compensates for the nonlinearity of the current-sensor output signal using a piecewise linear model. The sensor is controlled using its generic attribute profile. Sensor nodes and cell phones used to check the signals obtained from the sensor at 50-A input currents showed an accuracy of ±1%, exhibiting linearity in all communications within the range of 0 to 50 A, with a stable output voltage for each communication segment.

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5A Triboelectric Nanogenerator Design for the Utilization of Multi-Axial Mechanical Energies in Human Motions

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As the use of mobile devices increase, there is public interest in the utilization of the human motion generated mechanical energy. The human motion generated mechanical energies vary depending on the body region, type of motion, etc., and an appropriate device has to be designed to utilize them effectively. In this work, a device based on the principles of triboelectric generation and inertia was assessed in order to utilize the multi-axial mechanical energies generated by human motions. To improve the output performance we confirm the changes in the output that vary with the structural design, the reasons for such changes, and variations in performance based on the parts of the human body. In addition, the level of electrical energy generated based on motion type was measured; a maximum voltage of 30 V and a current of 2 μA were generated. Finally, the proposed device was utilized in LEDs used for lighting, thus demonstrating that multi-axial mechanical energies can be harvested effectively. Based on the results, we expect that the developed device can be utilized as a sensor to detect mechanical energies, to sense changes in motion, or as a generator for auxiliary power supply for mobile devices.

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6In0.8Ga0.2As HEMT 소자에서 Output-conductance가 차단 주파수에 미치는 영향에 대한 연구

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The impact of output conductance (go) on the short-circuit current-gain cut-off frequency (fT) in In0.8Ga0.2As high-electron-mobility transistors (HEMTs) on an InP substrate was investigated. An attempted was made to extract the values of fT in a simplified small-signal model (SSM) of the HEMTs, derive an analytical formula for fT in terms of the extrinsic model parameters of the simplified SSM, which are related to the intrinsic model parameters of a general SSM, and verify its validity for devices with Lg from 260 to 25 nm. In longchannel devices, the effect of the intrinsic output conductance (goi) on fT was negligible. This was because, from the simplified SSM perspective, three model parameters, such as gm_ext, Cgs_ext and Cgd_ext, were weakly dependent on goi. However, in short-channel devices, goi was found to play a significant role in degrading fT as Lg was scaled down. The increase in goi in short-channel devices caused a considerable reduction in gm_ext and an overall increase in the total extrinsic gate capacitance, yielding a decrease in fT with goi. Finally, the results were used to infer how fT is influenced by goi in HEMTs, emphasizing that improving electrostatic integrity is also critical importance to benefit fully from scaling down Lg.

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In this study, a highly crystalline SnO2 thin film was formed using a sol-gel process. In addition, a SnO2 thin-film transistor was successfully fabricated. The fabricated SnO2 thin-film transistor exhibited conventional n-type semiconductor properties, with a mobility of 0.1 cm2 V-1 s-1, an on/off current ratio of 1.2 × 105, and a subthreshold swing of 2.69. The formed SnO2 had a larger bandgap(3.95 eV) owing to the bandgap broadening effect. The fabricated photosensor exhibited a responsivity of 1.4 × 10-6 Jones, gain of 1.43 × 107, detectivity of 2.75 × 10-6 cm Hz1/2 W-1, and photosensitivity of 4.67 × 102.

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8InGaZnO 용액의 농도가 Drop-casting으로 제작된 산화물 박막 트랜지스터의 전기적 특성에 미치는 영향

저자 : 노은경 ( Eun-kyung Noh ) , 유경민 ( Kyeong Min Yu ) , 김민회 ( Min-hoi Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 29권 5호 발행 연도 : 2020 페이지 : pp. 332-335 (4 pages)

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Drop casting, a solution process, is a simple low-cost fabrication technique that does not waste material. In this study, we elucidate the effect of the concentration of a InGaZnO solution on the electrical properties of drop-cast oxide thin-film transistors. The higher the concentration the larger the amount of remnant InGaZnO solutes, which yields a thicker thin film. Accordingly, the electrical properties were strongly dependent on the concentration. At a high concentration of 0.3 M (or higher), a large current flowed but did not lead to switching characteristics. At a concentration lower than 0.01 M, switching characteristics were observed, but the mobility was small. In addition to a high mobility, sufficient switching characteristics were obtained at a concentration of 0.1 M owing to the appropriate thickness of the semiconductor layer. This study provides a technical basis for the low-cost fabrication of switching devices capable of driving a sensor array.

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9무게측정방식에 따른 Lever-linked Roberval Mechanism의 설계특성

저자 : 안지윤 ( Ji Yun An ) , 안중환 ( Jung Hwan Ahn ) , 이길승 ( Gil Seung Lee ) , 김화영 ( Hwa Young Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 29권 5호 발행 연도 : 2020 페이지 : pp. 336-341 (6 pages)

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The deflection and null balance methods are used for precision force measurement in the precision industry. Since both methods are based on deformation, the performance of the load cell mechanism is important. In this study, the design variables were obtained via the free body diagram of a lever-linked Roberval mechanism (combined with a flexible hinge link and a Roberval mechanism), and the design characteristics were analyzed according to the weight method. Based on the design characteristics, the optimal design was conducted according to the weight method and FEM was used to verify its reliability.

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10부영양화 사전 예방을 위한 휴대용 총인 모니터링 시스템 개발

저자 : 정동건 ( Dong Geon Jung ) , 김승덕 ( Seung Deok Kim ) , 권순열 ( Soon Yeol Kwon ) , 이재용 ( Jae Yong Lee ) , 김유성 ( Yu Seong Kim ) , 이준엽 ( Junyeop Lee ) , 김재건 ( Jaekeon Kim ) , 김세완 ( Sae-wan Kim ) , 공성호 ( Seong Ho Kong ) , 정대웅 ( Daewoong Jung )

발행기관 : 한국센서학회 간행물 : 센서학회지 29권 5호 발행 연도 : 2020 페이지 : pp. 342-347 (6 pages)

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In this study, a portable total-phosphorus (TP) monitoring system utilizing a photocatalytic-reaction-based pretreatment method is proposed, fabricated, and characterized. Commercial TP monitoring systems are only used in laboratories because of their complex monitoring procedure, bulk-size, and high-cost. In particular, pretreatment in commercial TP monitoring systems is performed at high temperatures (> 120 ℃) and pressure (> 1.1 kg cm-2) making it difficult to minimize the scale of the systems. The proposed TP monitoring system employs a pretreatment method with a photocatalytic reaction; thus, its size can be reduced, as photocatalytic reactions occur at room temperature and atmospheric pressure. Analytes with various TP concentrations are pretreated using the proposed portable TP monitoring system and are quantitatively measured with an LED and a photodiode.

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