An Electrically Modulated Single-Color/Dual-Color Imaging Photodetector.
basic_science · Level V
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- Record sourced from PubMed, PMID 32383310.
- Also identified by DOI 10.1002/adma.201907257.
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Abstract
An electrically modulated single-/dual-color imaging photodetector with fast response speed is developed based on a small molecule (CO<sub>i</sub> 8DFIC)/perovskite (CH<sub>3</sub> NH<sub>3</sub> PbBr<sub>3</sub> ) hybrid film. Owing to the type-I heterojunction, the device can facilely transform dual-color images to single-color images by applying a small bias voltage. The photodetector exhibits two distinct cut-off wavelengths at ≈544 nm (visible region) and ≈920 nm (near-infrared region), respectively, without any power supply. Its two peak responsivities are 0.16 A W<sup>-1</sup> at ≈525 nm and 0.041 A W<sup>-1</sup> at ≈860 nm with a fast response speed (≈10<sup>2</sup> ns). Under 0.6 V bias, the photodetector can operate in a single-color mode with a peak responsivity of 0.09 A W<sup>-1</sup> at ≈475 nm, showing a fast response speed (≈10<sup>2</sup> ns). A physical model based on band energy theory is developed to illustrate the origin of the tunable single-/dual-color photodetection. This work will stimulate new approaches for developing solution-processed multifunctional photodetectors for imaging photodetection in complex circumstances.