2D Silicon‐Based Semiconductor Si2Te3 toward Broadband Photodetection

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 17; no. 13
• Main Authors: Chen, Jiawang, Tan, Chaoyang, Li, Gang, Chen, Lijie, Zhang, Hanlin, Yin, Shiqi, Li, Ming, Li, Liang, Li, Guanghai
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.04.2021
• Subjects: 2D materials; Broadband; Compatibility; Field effect transistors; Nanotechnology; Optoelectronics; photodetector; Photoluminescence; Photometers; Semiconductor materials; Si 2Te 3; Silicon; silicon based; Spectral sensitivity; Tellurides; transistor; Two dimensional materials
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.202006496

Silicon‐based semiconductor materials dominate modern technology for more than half a century with extraordinary electrical‐optical performance and mutual processing compatibility. Now, 2D materials have rapidly established themselves as prospective candidates for the next‐generation semiconductor industry because of their novel properties. Considering chemical and processing compatibility, silicon‐based 2D materials possess significant advantages in integrating with silicon. Here, a systematic study is reported on the structural, electrical, and optical performance of silicon telluride (Si2Te3) 2D material, a IV−VI silicon‐based semiconductor with a layered structure. The ultrawide photoluminescence (PL) spectra in the range of 550–1050 nm reveals the intrinsic defects in Si2Te3. The Si2Te3‐based field‐effect transistors (FETs) and photodetectors show a typical p‐type behavior and a remarkable broadband spectral response in the range of 405–1064 nm. Notably, the photoresponsivity and detectivity of the photodetector device with 13.5 nm in thickness and upon 405 nm illumination can reach up to 65 A W−1 and 2.81 × 1012 Jones, respectively, outperforming many traditional broadband photodetectors. It is believed this work will excite interests in further exploring the practical application of 2D silicon‐based materials in the field of optoelectronics. A 2D silicon‐based photodetector based on Si2Te3 with broad spectrum response is introduced. The intrinsic defects in Si2Te3 are revealed through ultrawide photoluminescence spectra in the range of 550–1050 nm. A remarkable broadband spectral response from 405 to 1064 nm and a photoresponsivity up to 65 A W−1 is realized in Si2Te3‐based photodetectors.