Multiple hydrogen bonds induced by spacer conformation in two-dimensional perovskite for efficient optoelectronic devices

• Two-dimensional (2D) Dion-Jacobson (DJ) perovskites generally outperform their Ruddlesden-Popper analogues in photodetection (PD). However, the mechanism behind this performance enhancement remains elusive.

  
  

  Huahua Fu of Huazhong University of Science and Technology, Yaofang of Wuhan University, Ke Weijun, Fang Guoguo et al. introduced the theoretical calculation of multiple hydrogen bonds induced by the interlayer spacer conformation in two-dimensional perovskite, as well as the synthesis of DPAPbBr4 (DPB) single crystal and its PD properties under x-ray/ultraviolet (UV) excitation. High-quality DPB single crystal enhances PD with excellent photoresponse characteristics, including high on/off ratio (4.89×104), high responsivity (2.44 a/W), large dynamic linear range (154 dB), and low detection limit (7.1 nW/cm2), respectively, are currently the best results among two-dimensional perovskite single-crystal detectors.

  Importantly, high-resolution images are obtained under low-light levels of UV illumination. The SC x-ray detector has a high sensitivity of 663 μC Gyair-1 cm-2 and a detection limit of 1.44 μC Gyair s-1 at 10 V. This study explores the efficient and innovative optoelectronic applications of 2D DJ perovskites.

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• K. Dong, X. Yang, F. Yao, H. Cong, H. Zhou, S. Zhou, H. Cui, S. Wang, C. Tao, C. Sun, H. Fu, W. Ke, G. Fang, Spacer Conformation Induced Multiple Hydrogen Bonds in 2D Perovskite Toward Highly Efficient Optoelectronic Devices. Adv. Mater. 2024, 2313889.

  https://doi.org/10.1002/adma.202313889