Stable organic lead iodides with three-dimensional crystallographic and electronic structures showing high photoresponse

Hybrid lead halide perovskites have been intensively investigated due to their structural diversity and outstanding optoelectronic properties. As emerging semiconducting materials, their bandgaps play a key role in regulating the performance. Qualitative correlations between the bandgap and structure have been uncovered; however, quantified relationships have not yet been established. Herein, we report a series of hydrogen-bonded quasi-Dion–Jacobson (DJ) perovskite semiconductors, [(HOOC n H2n–2NH3)2]PbBr4 (n = 3–8), as a model system to set up a more clear relationship between the structural distortions and optoelectronic properties. When the n ranges from 4 to 8, the serial compounds are featured by distinctive hydrogen-bonded diammonium layers containing dimerized COOH linkers and balanced photoluminescent and photodetection properties. A linear relationship between the bandgap (E g) and two structural parameters (D int and D d) is set up, that is, E g = 2.694 + 0.004680D int + 0.3109D d, indicating the roles of both the interlayer distance and inorganic framework distortion. This work not only expands the typical DJ-type perovskites but also provides a deepened understanding of the relationship between the structures and optoelectronic properties.

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“…Notably, the cations contribute little to the band edges due to their relatively high electropositivity (Figure S4). , …”

Section: Resultsmentioning

confidence: 99%

Establishing a Relationship between the Bandgap and the Structure in 2D Lead Halide Perovskite Semiconductors

Fan

Liu

et al. 2023

Chem. Mater.

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“…To further understand the electronic properties of the HDA-BiI 5 , we calculate the partial charge density (PCD) . The most representative PCDs of the CBM and VBM are extracted from the ab -plane (Figure c and d).…”

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confidence: 99%

Spectrally Selective Polarization-Sensitive Photodetection Based on a 1D Lead-Free Hybrid Perovskite Ferroelectric

Liu

Fan

Liang

et al. 2023

ACS Materials Lett.

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Green, self-powered, flexible, and tunable features have been greatly desired to satisfy the increasing demands for next-generation photodetectors and sensors. Here, we report a 1D lead-free perovskite ferroelectric HDA-BiI 5 (HDA = hexane-1,6diammonium) based photodetector showing a spectrally selective linear polarized light response due to a unique linear dichroic conversion behavior. The HDA-BiI 5 single crystal device shows an orthogonal reverse of polarization-sensitive photocurrent and can distinguish linearly polarized light in different wavelength ranges with the photocurrent anisotropy ratio ω of about 1.37 at 405 nm, 1.00 at 490 nm, and 1.17 at 530 nm. Importantly, the device achieves a ferroelectricity-driven self-powered detection with an excellent ω (∼1.28 at 405 nm) and a high detectivity D* of 5.3 × 10 8 Jones. This research provides a pathway for the design of future integratable polarization-sensitive photodetectors.

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“…The in-plane-type device exhibits a high photoresponse with an on/off ratio of >10 4 under 130 mW/cm 2 sunlight illumination and in the dark (Figures d and S12). At the same time, under the same test conditions, the out-of-plane-type device also exhibits a relatively excellent photoresponse with an on/off ratio of >2.6 × 10 3 (Figures e and S13), comparable to a quasi-three-dimensional perovskite . After the out-of-plane-type device is positive poling by a 3 kV/cm electric field, V oc and I sc of the out-of-plane-type device are −0.29 V and 0.05 nA, respectively (Figure f).…”

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confidence: 72%

A Two-Dimensional Hybrid Lead Bromide Ferroelectric Semiconductor with an Out-of-Plane Polarization

et al. 2023

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A two-dimensional (2D) organic−inorganic hybrid perovskite (OIHP) material with out-of-plane ferroelectricity is the key to the miniaturization of vertical-sandwich-type ferroelectric optoelectronic devices. However, 2D OIHP ferroelectrics with out-of-plane polarization are still scarce, and effective design strategies are lacking. Herein, we report a novel 2D Dion−Jacobson perovskite ferroelectric semiconductor synthesized by a rigid-to-flexible cationic tailoring strategy, achieving an out-of-plane polarization of 1.7 μC/cm 2 and high photoresponse. Integrating out-of-plane ferroelectricity with excellent photoelectric properties affords a promising platform to investigate ferroelectricity-related effects in vertical optoelectronic devices.

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Stable organic lead iodides with three-dimensional crystallographic and electronic structures showing high photoresponse

Abstract: Motivated by the success of methylammonium lead iodide, substantial efforts have been made to search for moisture & air—stable metal halide perovskites (MHPs) for various optoelectronic applications. Lowering the structural dimensionality such...

Cited by 10 publications

References 50 publications

Establishing a Relationship between the Bandgap and the Structure in 2D Lead Halide Perovskite Semiconductors

Establishing a Relationship between the Bandgap and the Structure in 2D Lead Halide Perovskite Semiconductors

Spectrally Selective Polarization-Sensitive Photodetection Based on a 1D Lead-Free Hybrid Perovskite Ferroelectric

A Two-Dimensional Hybrid Lead Bromide Ferroelectric Semiconductor with an Out-of-Plane Polarization

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