The research results were titled "Strain-controlled power devices as inspired by human reflex" and published in the recent "Nature Communications". Co-corresponding authors are Associate Research Fellow of Hua Qilin, Researcher Hu Weiguo, and Academician Wang Zhonglin, Beijing Institute of Nano Energy and Systems, Chinese Academy of Sciences. This research work has been funded by the National Natural Science Foundation of China, the National Key Research and Development Program, and the Chinese Academy of Sciences Hundred Talents Program.
Figure 1 New intelligent stress-regulated power devices inspired by human nerve reflexes
a schematic diagram of the human knee jump reflection process;
b. Conceptual diagram of a new type of intelligent stress control power device (SPD).
Figure 2 Structure and characterization of SPD
a schematic diagram of a micron-scale cantilever structure AlGaN / GaN HEMT unit;
b. Scanning electron microscopy (SEM) photo of the device unit;
c. Elemental distribution map of AlGaN / AlN / GaN heterojunction;
d. High resolution transmission electron microscopy (TEM) pictures of AlGaN / AlN / GaN heterojunctions.
Figure 3 Electrical characteristics of SPD
a, b. SPD output characteristic and transfer characteristic curve;
c. Comparison of Raman spectrum of AlGaN / AlN / GaN heterojunction with or without micrometer cantilever structure;
d, e. Output characteristics of SPD under different stresses (0-16 mN) when the gate voltage is -5 V and 1 V, respectively;
f. Transconductance characteristic curves of SPD under different stresses (0mN, 4 mN and 16 mN).
Figure 4 SPD stress
a. When the grid voltage is -5 V and 1 V, the output power density of the SPD under different stresses (0-16 mN);
b. The relationship between the output power density of SPD and the input strain and grid voltage;
c. The relative output power density of the SPD during cyclic loading / releasing stress.
Figure 5 Repeatable stress dependence analysis of the device
a. SPD output characteristic curve during continuous loading / releasing stress (0/16 mN);
b. The relationship between SPD output and different stresses (0-16 mN) when the gate voltage is -10 V and 0 V.
Figure 6 SPD acceleration feedback power control
a. Conceptual diagram of automatic unsupervised output power adjustment of an autonomous vehicle under emergency braking conditions;
b. Conceptual diagram of power self-adjustment for the robot to achieve attitude balance during the movement process;
c. Real-time self-adjusting output power of SPD under different acceleration (1-5G);
d. The relationship between the SPD output power density change and acceleration.
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