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- W2883141625 abstract "Low bulk band gaps and conductive surface electronic states of tetradymite topological insulators (TTI) make them potential candidates for next generation ultra-broadband photodevices. Here, we demonstrate a broadband and self-biased photodiode based on a Sb2Te3-Si heterostructure. A low-cost thermal evaporation technique was employed to fabricate the photodiode. The self-biased nature of the photodiode was due to the built-in potential at the Sb2Te3-Si interface. Upon characterizing the Sb2Te3 nanocrystalline film via AFM, SEM, EDX, and XPS it was found that the film exhibited p-type behavior due to antimony vacancies or antisites. The fabricated photodiode showed an excellent rectification ratio of 3388 with n-Si confirming a robust Schottky barrier at the interface and a well-defined photocurrent upon illumination. Due to the p-type behavior of the Sb2Te3 nanocrystalline film, a rectification ratio of only 0.38 was observed with p-Si. The barrier at the interface also increases the carrier lifetimes, thereby eliminating one of the biggest drawbacks of ultrafast carrier recombination times in TTI as a photodetection material. Moreover, the photodiode exhibited excellent Ion/Ioff of three orders of magnitude under the self-biased conditions, and photocurrents ranging from 520 nm to 980 nm wavelengths were observed." @default.
- W2883141625 created "2018-08-03" @default.
- W2883141625 creator A5000280535 @default.
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- W2883141625 date "2018-01-01" @default.
- W2883141625 modified "2023-10-02" @default.
- W2883141625 title "A broadband, self-biased photodiode based on antimony telluride (Sb<sub>2</sub>Te<sub>3</sub>) nanocrystals/silicon heterostructures" @default.
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- W2883141625 doi "https://doi.org/10.1039/c8nr04047h" @default.
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