Fig. 1: Working mechanism of dark-current-shunting (DCS) detector and conventional photoconduction detector. | Nature Communications

Fig. 1: Working mechanism of dark-current-shunting (DCS) detector and conventional photoconduction detector.

From: Realizing nearly-zero dark current and ultrahigh signal-to-noise ratio perovskite X-ray detector and image array by dark-current-shunting strategy

Fig. 1: Working mechanism of dark-current-shunting (DCS) detector and conventional photoconduction detector.The alt text for this image may have been generated using AI.

a Working mechanism of conventional photoconduction detector. The dark current and photocurrent are conducted in the same path and collected by the same electrodes. b Working mechanism of dark-current-shunting (DCS) detector. The electrons in the dark are emitted from the source and collected by the DCS electrode. c The X-ray induced electrons are generated from X-ray sensitive material and part of them drifted into a conduction channel with high carrier mobility under a built-in electric field between X-ray sensitive material and electron transport layer (ETL), then collected by drain electrode under an electric field applied in the lateral conduction channel. Even some of the X-ray induced electrons will be attracted to DCS electrode, with the high photoconductive gain effect of the conduction channel, the photocurrent is still strong.

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