Spacer Conformation Induced Multiple Hydrogen Bonds in 2D Perovskite toward Highly Efficient Optoelectronic Devices.
basic_science · Level V
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- Record sourced from PubMed, PMID 38536181.
- Also identified by DOI 10.1002/adma.202313889.
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Abstract
Two-dimensional (2D) Dion-Jacobson (DJ) perovskites typically outperform Ruddlesden-Popper (RP) analogs in terms of photodetection (PD). However, the mechanism behind this enhanced performance remains elusive. Theoretical calculations for elucidating interlayer spacer conformation-induced multiple hydrogen bonds in 2D perovskite are presented, along with the synthesis of DPAPbBr<sub>4</sub> (DPB) single crystals (SCs) and their PD properties under X-ray/ultraviolet (UV) excitation. The high-quality DPB SC enhances PD with exceptional photoresponse attributes, including a high on/off ratio (4.89 × 10<sup>4</sup>), high responsivity (2.44 A W⁻<sup>1</sup>), along with large dynamic linear range (154 dB) and low detection limit (7.1 nW cm⁻<sup>2</sup>), which are currently the best results among 2D perovskite SC detectors, respectively. Importantly, high-resolution images are obtained under UV illumination with weak light levels. The SC X-ray detector exhibits a high sensitivity of 663 µC Gy<sub>air</sub>⁻<sup>1</sup> cm<sup>-2</sup> at 10 V and a detection limit of 1.44 µGy<sub>air</sub> s⁻<sup>1</sup>. This study explores 2D DJ perovskites for efficient and innovative optoelectronic applications.