U.S. Patent  Jun.25,2019  Sheet 5 of 35  US 10,332,688 B2  Figure 5  -30  ,-...,  N  E  -25  (.)  ~  -20  E  ._.  .Z"  -15  r.n  C  '  -10  ’"C  +- C  •-5  OJ  C:  ::J  0  0  -0.5  0.0  0.5  1 .. 0  Voltage (V) 