2D Ruddlesden-Popper Perovskite with Ordered Phase Distribution for High-Performance Self-Powered Photodetectors.
basic_science · Level V
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- Record sourced from PubMed, PMID 34302390.
- Also identified by DOI 10.1002/adma.202101714.
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Abstract
2D Ruddlesden-Popper perovskites exhibit great potential in optoelectronic devices for superior stability compared with their 3D counterparts. However, to achieve a high level of device performance, it is crucial but challenging to regulate the phase distribution of 2D perovskites to facilitate charge carrier transfer. Herein, using a solvent additive method (adding a small amount of dimethyl sulfoxide (DMSO) in N,N-dimethylformamide (DMF)) combined with a hot-casting process, the phase distribution of (PEA)<sub>2</sub> MA<sub>3</sub> Pb<sub>4</sub> I<sub>13</sub> (PEA<sup>+</sup> = C<sub>6</sub> H<sub>5</sub> CH<sub>2</sub> CH<sub>2</sub> NH<sub>3</sub> <sup>+</sup> , MA<sup>+</sup> = CH<sub>3</sub> NH<sub>3</sub> <sup>+</sup> ) perovskite can be well controlled and the Fermi level of perovskites along the film thickness direction can achieve gradient distribution. The increased built-in potential, oriented crystal, and improved crystal quality jointly contribute to the high photoresponse of devices in the entire response spectrum range. The optimum device exhibits a characteristic detection peak at 570 nm with large responsivity/detectivity (0.44 A W<sup>-1</sup> /3.38 × 10<sup>12</sup> Jones), ultrafast response speed with a rise/fall time of 20.8/20.6 µs, and improved stability. This work suggests the possibility of manipulating the ordered phase distribution of 2D perovskites toward high-performance and stable optoelectronic conversion devices.