Fig. 5: Impact of different noise conditions on D* in scenarios of single detection and imaging detection.
From: How to characterize figures of merit of two-dimensional photodetectors
a Noise and responsivity characteristics for photodetectors with different response bandwidths for single detection (the blue line represents the typical responsivity curve of photodetectors of high response bandwidth, the green line represents the typical responsivity curve of photodetectors of low response bandwidth, and the red line represents the typical noise characteristics. The vertical dashed lines represent the −3 dB bandwidth for photodetectors with high and low response bandwidth). b Overestimation of specific detectivity based on noise characteristics for single detection. The solid and dashed lines present the calculated specific detectivity with \({D}^{*}=\frac{R\sqrt{{A}_{d}\Delta f}}{{i}_{n}}\) from the measured noise and estimated noise of thermal noise and shot noise (ignoring the 1/f noise and g-r noise). c Noise and responsivity characteristics for photodetectors of imaging detection. d Overestimation of specific detectivity based on noise characteristics for imaging detection. The solid and dashed lines present the calculated specific detectivity with \({D}^{*}=\frac{R\sqrt{{A}_{d}{f}_{B}}}{\sqrt{{\int }_{0}^{{f}_{B}}{i}_{n}{df}}}\) from the measured noise and estimated noise of thermal noise and shot noise (ignoring the 1/f noise and g-r noise).
