Ambipolar conduction and multicolor photosensing behaviors from poly (9,9-di-n-octylfluorenyl-2,7-diyl)-molybdenum disulfide heterointerfaces
- Authors
- Lee, Dong Hyun; Yun, Hyung Joong; Hong, Seongin; Yoo, Hocheon
- Issue Date
- Dec-2021
- Publisher
- ELSEVIER
- Keywords
- Molybdenum disulfide; Transition metal dichalcogenides; Poly(9, 9-di-n-octylfluorenyl-2, 7-diyl); Heterojunction; Ambipolarity; Photosensitivity
- Citation
- SURFACES AND INTERFACES, v.27
- Journal Title
- SURFACES AND INTERFACES
- Volume
- 27
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/82347
- DOI
- 10.1016/j.surfin.2021.101448
- ISSN
- 2468-0230
- Abstract
- Molybdenum disulfide (MoS2) in two-dimensional (2D) transition metal dichalcogenides (TMDs) has attracted attention as a next-generation semiconductor material owing to its intriguing electrical, optical, and mechanical characteristics, which enable its applications in flexible display backplane thin-film transistors, photodetectors, and complementary metal oxide semiconductor (CMOS) digital circuits. However, MoS2 films only have n-type operating characteristics, and p-type conduction in MoS2 devices has rarely been reported owing to their strong n-type semiconducting property. Herein, we demonstrate the p-doping effects in poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO)-MoS2 heterointerface. By simply coating PFO on the top of pre-fabricated MoS2 field effect transistors (FETs), the proposed PFO-MoS2 heterointerface devices could be implemented. A positive shift in the threshold voltage and reduction in the on-current were observed in the proposed PFO-MoS2 heterointerface devices, which indicated ambipolar characteristics with p- and n-type charge transport behaviors. More importantly, the multicolor photosensing behaviors by red, green, and blue light with enhanced sensitivity of PFO-MoS2 hetero-interfacial devices were enhanced.
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