Fig. 3
From: Giant piezoresistive effect by optoelectronic coupling in a heterojunction
The role of the tuning current in the enhancement of the piezoresistive effect. a Characteristics of GF with respect to the supplied tuning current. Three ranges of tuning current are magnified in b, the negative GF range; in c, the optimal range; and in d, the positive GF range. Under the same light condition, the sensitivity (i.e., GF) changed significantly versus the supplied current. Under a light intensity of 19,000 lx, as the supplied current was swept from 15 to 45 μA, the GF increased from approximately −16 to a maximum of ~95,500, and then decreased to about ~50
