Visible Phototransistors Based on Vertical Nanolayered Heterostructures of SnS/SnS2 p-n and SnSe2/SnS2 n-n Nanoflakes
Author(s): Tian, H (Tian, He); Meng, XC (Meng, Xiancheng); Yang, JH (Yang, Juehan); Fan, C (Fan, Chao); Yuan, S (Yuan, Shuo); An, X (An, Xia); Sun, C (Sun, Chun); Zhang, YH (Zhang, Yonghui); Wang, MJ (Wang, Mengjun); Zheng, HX (Zheng, Hongxing); Wei, ZM (Wei, Zhongming); Li, EP (Li, Erping)
Source: ACS APPLIED NANO MATERIALS Volume: 3 Issue: 7 Pages: 6847-6854 DOI: 10.1021/acsanm.0c01213 Published: JUL 24 2020
Abstract: Two-dimensional (2D) nanomaterials have been attracting intensive interest due to their unique physical and optoelectronic properties. Van der Waals nanolayered heterostructures based on different 2D nanomaterials provide a state-of-the-art platform for investigating the physical phenomena and have extended the applications of 2D nanomaterials, leading to an era of next-generation high-performance electronic and optoelectronic technology. Herein, vertical 2D SnS/SnS2 p-n and SnSe2/SnS2 n-n nanolayered heterostructures are constructed by exfoliating individual materials and stacking them artificially. The two types of back-gate field-effect phototransistors show clear rectifying behaviors with the existence of band offset and excellent optoelectronic performances. The SnS/SnS2 p-n nanolayered heterostructure shows an ambipolar behavior with a hole mobility of 6.96 cm(2).V-1.s(-1) and electron mobility of 0.68 cm(2).V-1.s(-1), while the SnSe2/SnS2 n-n nanolayered heterostructure shows an intense n-type behavior with electron mobility of 3.78 cm(2).V-1.s(-1) and a high on/off ratio of over 10(5). Interestingly, due to the band alignments and built-in potentials in the two types of nanolayered heterostructures, the phototransistors exhibit enhanced responsive performances to illuminations of three-primary-color lasers (lambda = 405, 532, and 650 nm) compared to the individual components. The SnS/SnS2 phototransistor shows a high photoresponsivity of 3567 A W-1, a high detectivity of 3.64 x 10(13) Jones, and a fast response time of 0.8 ms. The SnSe2/SnS2 phototransistor also exhibits a high photoresponsivity of 1793 A W-1 and a fast response time of 15.4 ms.
Accession Number: WOS:000555518200069
ISSN: 2574-0970