Effective Piezo‐Phototronic Enhancement of Flexible Photodetectors Based on 2D Hybrid Perovskite Ferroelectric Single‐Crystalline Thin‐Films

Ding, Ran; Lyu, Yongxin; Wu, Zhenghao; Guo, Feng; Io, Weng Fu; Pang, Sin-Yi; Zhao, Yuqian; Mao, Jianfeng; Wong, Man‐Chung; Hao, Jian

doi:10.1002/adma.202101263

Cited by 69 publications

(60 citation statements)

References 53 publications

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“…[21] Moreover, the designable Lewis base/acid substituents in OFeMs enable us to regulate the defect states and crystallization dynamics of the perovskites. [22][23][24] In addition, the polarization orientations in the microstructures of the OFeM domains are likely to switch along with variations in the external electric field directions. [25] When the dipole moment direction is aligned with that of the device BEF, the BEF strength is further enhanced, which is beneficial for the separation and extraction of the photogenerated carriers.…”

Section: Introductionmentioning

confidence: 99%

High‐Polarizability Organic Ferroelectric Materials Doping for Enhancing the Built‐In Electric Field of Perovskite Solar Cells Realizing Efficiency over 24%

Chen

Liu

et al. 2022

Advanced Materials

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The built‐in electric field (BEF) intensity of silicon heterojunction solar cells can be easily enhanced by selective doping to obtain high power conversion efficiencies (PCEs), while it is challenging for perovskite solar cells (pero‐SCs) because of the difficulty in doping perovskites in a controllable way. Herein, an effective method is reported to enhance the BEF of FA0.92MA0.08PbI3 perovskite by doping an organic ferroelectric material, poly(vinylidene fluoride):dabcoHReO4 (PVDF:DH) with high polarizability, that can be driven even by the BEF of the device itself. The polarization of PVDF:DH produces an additional electric field, which is maintained permanently, in a direction consistent with that of the BEF of the pero‐SC. The BEF superposition can more sufficiently drive the charge‐carrier transport and extraction, thus suppressing the nonradiative recombination occurring in the pero‐SCs. Moreover, the PVDF:DH dopant benefits the formation of a mesoporous PbI2 film, via a typical two‐step processing method, thereby promoting perovskite growth with high crystallinity and a few defects. The resulting pero‐SC shows a promising PCE of 24.23% for a 0.062 cm2 device (certified PCE of 23.45%), and a remarkable PCE of 22.69% for a 1 cm2 device, along with significantly improved moisture resistances and operational stabilities.

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Section: Introductionmentioning

confidence: 99%

High‐Polarizability Organic Ferroelectric Materials Doping for Enhancing the Built‐In Electric Field of Perovskite Solar Cells Realizing Efficiency over 24%

Chen

Liu

et al. 2022

Advanced Materials

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“…The responsivity ( R ) as the key parameter of the devices is provided based on the following data analyses. [ 36 ] R represents the ratio of photocurrent responding to the illumination intensity, which can be defined as

R = \frac{I_{ph}}{P \times A} = \frac{I_{light} - I_{dark}}{P \times A}

where I ph is the photocurrent current, I light is the illuminated current, I dark is the dark current, A is the effective device area, and P is the incident light intensity. The photocurrent and responsivity corresponding to the incident light intensity at a bias voltage of 3 V are plotted in Figure 4d with a linear correlation as high as 0.99 in logarithmic coordinates.…”

Section: Resultsmentioning

confidence: 99%

“…The response speed is characterized by the rise time (τ rise ) and the decay time (τ decay ), as shown The responsivity (R) as the key parameter of the devices is provided based on the following data analyses. [36] R represents the ratio of photocurrent responding to the illumination intensity, which can be defined as…”

Section: Optoelectronic Stability Of the Devicementioning

confidence: 99%

“…τ rise and τ decay for K-based FD are 108 and 91 ms, respectively, measured under 405 nm laser with light intensity of 2.98 mW cm À2 . τ rise and τ decay for Pristine FD are 137 and 90 ms measured under the same condition, respectively.The responsivity (R) as the key parameter of the devices is provided based on the following data analyses [36]. R represents the ratio of photocurrent responding to the illumination intensity, which can be defined as…”

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confidence: 99%

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A Universal Approach for Potassium‐Passivated 2D Perovskites

Wang

et al. 2022

Solar RRL

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2D hybrid halide‐layered perovskites have been compelling candidates for photovoltaics and optoelectronics owing to their remarkable electrical and optical properties. However, high‐quality crystals are usually obtained either through complicated and energy‐consuming procedures or using toxic solvents, which remains a significant challenge to the crystal synthesis. To address the issue, a facile, universal, ecofriendly, and energy‐saving approach to synthesize the Ruddlesden−Popper‐ and Dion−Jacobson‐phase 2D‐layered potassium‐passivated perovskites at room temperature is reported. By involving potassium iodide to the reaction, potassium ions can assist both the crystal growth and surface passivation, improving their stability and passivated trap states. Potassium‐passivated (R‐MBA)2PbI4 exhibits superior optoelectronic features than pristine (R‐MBA)2PbI4 as well as outstanding strain stability. The findings herein may not only improve synthetic methods to obtain high‐quality crystals, but also motivate more fundamental investigations for potential optoelectronic and flexible applications.

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“…Figure 4a displays the flexible perovskite device structure and the bending system to apply compressive and tensile strain on the flexible 2D perovskite thin film on polyethylene terephthalate (PET) substrates. The applied global bending strain (ε′) on the PET substrate can be measured according to the following relationship: [62] /…”

Section: Microstrain Release Of Flexible 2d Perovskite and Photodetec...mentioning

confidence: 99%

Supramolecular Interactions of Flexible 2D Perovskite in Microstrain Releasing and Optoelectronic Properties Recovery

Song

Feng

Wei

et al. 2022

Adv Funct Materials

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The conductivity of 2D perovskite is mainly dominated by halide metal octahedron skeletons. However, in contrast to 3D perovskite structures, the layered inorganic skeletons are easily compressed or stretched by large organic cations, causing serious microstrain with impaired optoelectronic responses. Here, fluorination modulated supramolecular interactions in 2D fluorophenethylammonium lead iodide (FPEA 2 PbI 4 ) perovskites are reported. In the double layered organic spacer, interlayer supramolecular interactions between electronegative F atoms and electron-rich benzene rings dominate the lattice microstrain of 2D (p-FPEA) 2 PbI 4 perovskite, which can be released by interlayer interactions pulling during compressively bending the flexible devices. This strong electrostatic interaction can maximally release the compression to the inorganic octahedron skeleton during compressive bending, leading to a maximum degree of released microstrain with improved stability. The 60% microstrain can be released by compressive bending, and the corresponding photocurrent response is recovered by about three times in (p-FPEA) 2 PbI 4 perovskite film. In contrast, intralayer supramolecular interactions dominate microstrain of 2D (o-FPEA) 2 PbI 4 perovskites, which prevents the microstrain release during compressive bending. The strong electrostatic interaction design in the organic spacer of 2D perovskite takes an important role in releasing the microstrain and re-bursting the device performance of flexible perovskite devices.

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Effective Piezo‐Phototronic Enhancement of Flexible Photodetectors Based on 2D Hybrid Perovskite Ferroelectric Single‐Crystalline Thin‐Films

Cited by 69 publications

References 53 publications

High‐Polarizability Organic Ferroelectric Materials Doping for Enhancing the Built‐In Electric Field of Perovskite Solar Cells Realizing Efficiency over 24%

High‐Polarizability Organic Ferroelectric Materials Doping for Enhancing the Built‐In Electric Field of Perovskite Solar Cells Realizing Efficiency over 24%

A Universal Approach for Potassium‐Passivated 2D Perovskites

Supramolecular Interactions of Flexible 2D Perovskite in Microstrain Releasing and Optoelectronic Properties Recovery

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