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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.