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( Phung Dinh Hoat ),( Vo Van Khoe ),( Sung-hoon Bae ),( Hyo-jun Lim ),( Pham Tien Hung ),( Young-woo Heo ) 한국센서학회 2021 센서학회지 Vol.30 No.5
Recently, cesium tellurium iodine (Cs<sub>2</sub>TeI<sub>6</sub>) 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 Cs<sub>2</sub>TeI<sub>6</sub> thin films by a two-step dry process. A Cs<sub>2</sub>TeI<sub>6</sub>-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 Cs<sub>2</sub>TeI<sub>6</sub> film in optoelectronics.
Phung Dinh Hoat,In-Taek Lee,Hyo-Jun Lim,Yu-Jin Nam,Sung-Hoon Bae,Sangwook Lee,Joon-Hyung Lee,Young-Woo Heo 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
This study proposes a reliable process for synthesizing hybrid nanomaterials made of methylammonium tin iodide (MASnI<sub>3</sub>) submicron spheres and tin dioxide (SnO<sub>2</sub>) nanowires. Post-fabricated hybrid nanomaterials were investigated for NO<sub>2</sub> sensing properties at 25℃ in the dark. The effect of moisture on the NO<sub>2</sub> sensitivity and the durability of sensor components using this material was investigated. The limit of NO<sub>2</sub> detection is 25ppb with a response of 10. Additionally, the NO<sub>2</sub> sensing mechanism of this hybrid nanomaterial has been proposed and discussed.
Biaxial p-SnO/n-ZnO nanowires and its NO₂ gas sensing properties
Phung Dinh Hoat,In-Taek Lee,Hyo-Jun Lim,Yu-Jin Nam,Sung-Hoon Bae,Sangwook Lee,Joon-Hyung Lee,Young-Woo Heo 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
In this study, we introduce a single-step process for synthesizing biaxial p-SnO/n-ZnO heterostructured nanowires using a CVD system. The growth process includes: the VLS catalyticgrowth of the ZnO nanowire and subsequent epitaxial SnO growth on the sidewall of the pre-grown ZnO nanowire. The device exhibit a good performance to ppb-level NO<sub>2</sub> at room temperature (without light illumination) with the detection limit of 50ppb. the NO<sub>2</sub> sensing properties was investigated under various relative humidity. Finally, the NO<sub>2</sub> sensing mechanism of the p-SnO/n0ZnO nanowires was proposed and discussed.