Abstract
The single-photon absorption induced single event transient in the silicon-germanium heterojunction bipolar transistor is investigated. The laser wavelength and bias condition have been proven to have significant impacts on the characterization of the single event transient (SET) response of the device by two-dimensional (2-D) raster scanning. After optical analytical calculation, the laser-induced charge distribution is well-embedded in the 3-D TCAD process simulation conducted to explore the underlying physical mechanism. In addition to the ion shunt effect, the excess electron injection from the emitter to the base could play a vital role in the SET peak amplitude and charge collection. The impact of the metal layer on the SPA experimental results is also determined by establishing a figure of merit that will help researchers estimate the laser-induced transient sensitivity of devices with metal layer blocking.
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The authors would like to thank the contributions of the Institute of Microelectronics, Tsinghua University, for providing the DUT in this work. Sun Yabin and Fu Jun have also provided many valuable suggestions on the process simulation. The authors and Shangguan Shipeng from NSSC have carried out many meaningful discussions on the pulsed laser’s application. What is more, the authors are very grateful to the engineers of SPELS and EKSPLA for their technical support on the daily use of the laser system.
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Pan, X., Guo, H., Feng, Y. et al. Single event transient characterization of SiGe HBT by SPA experiment and 3-D process simulation. Sci. China Technol. Sci. 65, 1193–1205 (2022). https://doi.org/10.1007/s11431-021-2013-1
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DOI: https://doi.org/10.1007/s11431-021-2013-1