Journal article
Evaporated SexTe1-x Thin Films with Tunable Bandgaps for Short-Wave Infrared Photodetectors
C Tan, M Amani, C Zhao, M Hettick, X Song, DH Lien, H Li, M Yeh, VR Shrestha, KB Crozier, MC Scott, A Javey
Advanced Materials | WILEY-V C H VERLAG GMBH | Published : 2020
Abstract
Semiconducting absorbers in high-performance short-wave infrared (SWIR) photodetectors and imaging sensor arrays are dominated by single-crystalline germanium and III–V semiconductors. However, these materials require complex growth and device fabrication procedures. Here, thermally evaporated SexTe1-x alloy thin films with tunable bandgaps for the fabrication of high-performance SWIR photodetectors are reported. From absorption measurements, it is shown that the bandgaps of SexTe1-x films can be tuned continuously from 0.31 eV (Te) to 1.87 eV (Se). Owing to their tunable bandgaps, the peak responsivity position and photoresponse edge of SexTe1-x film-based photoconductors can be tuned in th..
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Grants
Awarded by U.S. Department of Energy
Funding Acknowledgements
C.T. and M.A. contributed equally to this work. Device fabrication and measurements were supported by the Defense Advanced Research Projects Agency under Contract No. HR0011-16-1-0004. Synthesis work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05CH11231 within the Electronic Materials Program (KC1201). Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The authors also thank Dr. Yeonbae Lee for his kind help on the RBS measurements.