Photo‐Induced Degradation of 2D Dion−Jacobson Perovskites under Continuous Light Illumination

Zeng, Zhongle; Chen, Xiangyu; Yue, Yunfan; Li, Sheng; Chai, Nianyao; Mai, Bo; Meng, Jiaqi; Cheng, Yi‐Bing; Wang, Xuewen

doi:10.1002/solr.202200359

Cited by 7 publications

(4 citation statements)

References 49 publications

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“…Adapted with permission. [ 137 ] Copyright 2018, Springer Nature. j) Directly evidence into the deep‐level trap states formed after white light soaking (red line) as compared with steady‐state thin (blue line) by NIR absorption measurement in the MAPbI 3 .…”

Section: Negative Effects Of Lsesmentioning

confidence: 99%

“…Zeng et al found DJ phase 2D perovskite [NH 3 (CH) 3 NH 3 ](FA) n −1 Pb n I 3 n +1 can transform to 3D α‐FAPbI 3 under continuous illumination. [ 137 ] In this process, the hydrogen bonds between the inorganic layer and the organic diammonium spacers are broken, which causes the dissociation of diammonium spacers. Afterward, α‐FAPbI 3 is formed by the inorganic layer directly in contact with the adjacent inorganic layer, and also further degrades into PbI 2 and δ‐FAPbI 3 .…”

Section: Negative Effects Of Lsesmentioning

confidence: 99%

“…h) Evolution of device trap density of states and i) the transient photovoltage for MAPbI 3 solar cells after illumination under maximum power point (MPP) at 20 °C, MPP at 60 °C, and open circuit condition at 60 °C for 2 h, respectively. Adapted with permission [137]. Copyright 2018, Springer Nature.…”

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confidence: 99%

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Positive and Negative Effects under Light Illumination in Halide Perovskites

Zhang,

Wei,

Ghasemi

et al. 2024

Small Science

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Metal halide perovskites (MHPs) have excellent characteristics and present great potential in a broad range of applications such as solar cells, light‐emitting diodes, and photodetectors. However, the light stability of devices remains an unresolved issue and has received great research attention. Under light illumination, MHPs exhibit various anomalous phenomena, such as photoluminescence (PL) enhancement, defect curing, PL blinking, and phase segregation. These phenomena are commonly considered intimately correlated with the performance and stability of MHP devices. In recent years, significant efforts have been made experimentally and theoretically toward understanding the physical origins of these anomalous effects. However, most research focuses on negative effects while the positive effects are mostly ignored. Herein, the positive effects and the negative effects of light soaking in MHPs are systematically discussed with a classification of the correlated physical mechanisms by specifically focusing on variation occurring in timescale from second to hour, corresponding to the unique ionic–electronic interaction. This intends to provide a new insight into ion effects on excellent properties of perovskites, and deep physical understanding of charge‐carrier and ion dynamics in perovskite, and theoretical guidelines for the fabrication of high‐quality and stability perovskite‐based photovoltaic and photoelectric devices.

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Section: Negative Effects Of Lsesmentioning

confidence: 99%

Section: Negative Effects Of Lsesmentioning

confidence: 99%

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Positive and Negative Effects under Light Illumination in Halide Perovskites

Zhang,

Wei,

Ghasemi

et al. 2024

Small Science

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“…26,27 However, ironically, photostability has become a major topic of discussion among researchers in the 2D perovskite research field, as it is a significant challenge to their application in optoelectronic devices. [28][29][30][31][32][33] For example, the daily used fluorescent lamps, which emit also high-energy photons at extremely low intensities, can rapidly degrade the surface structure of 2D RP perovskites. 29 In many reports, it has been also revealed that the high-energy light irradiation on perovskites can disrupt crystalline structures, leading to undercoordinated Pb states that impede carrier transport and cause substantial loss of photoluminescence (PL).…”

Section: Introductionmentioning

confidence: 99%

Enhancing photostability of 2D Ruddlesden–Popper perovskite via molecular acceptor passivation of metallic lead defects

Kim,

Kang,

Blumstengel

et al. 2023

Applied Physics Reviews

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Two-dimensional (2D) Ruddlesden–Popper (RP) perovskites hold great potential for novel optoelectronic applications. However, their unconventional optoelectronic properties are often compromised by a vulnerability to light irradiation, which leads to the formation of metallic Pb (Pb0) defects. This study investigates the passivation mechanism of these Pb0 defects in phenylethylammonium lead iodide (PEA2PbI4) using a strong molecular acceptor, 2,2′-(perfluoronaphthalene-2, 6-diylidene) dimalononitrile (F6-TCNNQ). In situ x-ray photoelectron spectroscopy results demonstrate that F6-TCNNQ effectively removes the light-induced Pb0 states, leading to the recovery of photoluminescence intensity in photodegraded PEA2PbI4 samples and significantly improving the photostability of pristine PEA2PbI4. F6-TCNNQ protects the terrace edge of PEA2PbI4, which is the site of initial degradation, as evidenced by atomic force microscopy and scanning electron microscopy analyses. In situ ultraviolet photoelectron spectroscopy measurements confirm substantial electron transfer from Pb0 to F6-TCNNQ, causing the oxidation of Pb0 to Pb2+. Furthermore, the staggered energy level alignment prevents electron transfer from the valence band maximum of PEA2PbI4 to the lowest unoccupied molecular orbital of F6-TCNNQ, thereby preserving the pristine electronic structure of PEA2PbI4. These findings provide new insights into defect passivation in 2D RP perovskites and offer a design strategy for highly stable optoelectronic devices.

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Ultrafast Photoexcitation Induced Passivation for Quasi‐2D Perovskite Photodetectors

Yue,

Chai,

et al. 2024

Advanced Materials

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Quasi‐2D perovskites exhibit great potential in photodetectors due to their exceptional optoelectronic responsivity and stability, compared to their 3D counterparts. However, the defects are detrimental to the responsivity, response speed, and stability of perovskite photodetectors. Herein, an ultrafast photoexcitation‐induced passivation technique is proposed to synergistically reduce the dimensionality at the surface and induce oxygen doping in the bulk, via tuning the photoexcitation intensity. At the optimal photoexcitation level, the excited electrons and holes generate stretching force on the Pb─I bonds at the interlayered [PbI6]−, resulting in low dimensional perovskite formation, and the absorptive oxygen is combined with I vacancies at the same time. These two induced processes synergistically boost the carrier transport and interface contact performance. The most outstanding device exhibits a fast response speed with rise/decay time of 201/627 ns, with a peak responsivity/detectivity of 163 mA W−1/4.52 × 1010 Jones at 325 nm and the enhanced cycling stability. This work suggests the possibility of a new passivation technique for high performance 2D perovskite optoelectronics.

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Photo‐Induced Degradation of 2D Dion−Jacobson Perovskites under Continuous Light Illumination

Cited by 7 publications

References 49 publications

Positive and Negative Effects under Light Illumination in Halide Perovskites

Positive and Negative Effects under Light Illumination in Halide Perovskites

Enhancing photostability of 2D Ruddlesden–Popper perovskite via molecular acceptor passivation of metallic lead defects

Ultrafast Photoexcitation Induced Passivation for Quasi‐2D Perovskite Photodetectors

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