title: Composition and bandgap-graded semiconductor alloy nanowires.
abstract: Semiconductor alloy nanowires with spatially graded compositions (and bandgaps) provide a new material platform for many new multifunctional optoelectronic devices, such as broadly tunable lasers, multispectral photodetectors, broad-band light emitting diodes (LEDs) and high-efficiency solar cells. In this review, we will summarize the recent progress on composition graded semiconductor alloy nanowires with bandgaps graded in a wide range. Depending on different growth methods and material systems, two typical nanowire composition grading approaches will be presented in detail, including composition graded alloy nanowires along a single substrate and those along single nanowires. Furthermore, selected examples of applications of these composition graded semiconductor nanowires will be presented and discussed, including tunable nanolasers, multi-terminal on-nanowire photodetectors, full-spectrum solar cells, and white-light LEDs. Finally, we will make some concluding remarks with future perspectives including opportunities and challenges in this research area.
authors: College of Physics and Microelectronics Science, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, Hunan University, Changsha, 410082, China.
authors: Xiujuan
authors: X
authors: Zhuang
authors: C Z
authors: CZ
authors: Ning
authors: Anlian
authors: A
authors: Pan
mesh_terms: D000497:Alloys / Q000737:chemistry*; D007834:Lasers; D008027:Light; D053770:Nanowires / Q000737:chemistry*; D012666:Semiconductors; D012993:Solar Energy
chemical_list: D000497:Alloys