Fig. 2: Challenges in responsivity/EQE characterization.
From: Guidelines for accurate evaluation of photodetectors based on emerging semiconductor technologies
a, Left: overfilling incident beam causing inaccurate responsivity/EQE determination due to carrier generation beyond the nominal active area, extending into a peripheral region of feature size DL. Right: aperture adoption for accurate responsivity/EQE determination. b, Importance of monitoring the time-dependent dark current for accurate responsivity/EQE measurements, during which the device is subjected to multiple optical pulses with power Pi(t). c, Impact of unsuitable modulation frequency on modulated measurements for continuous-wave responsivity/EQE characterization. d, Time-domain illustration of the effect displayed in c. Top: suitable modulation frequency, allowing the accurate determination of the continuous-wave responsivity/EQE from a modulated measurement. Bottom: unsuitable modulation frequency.
