Oxygen Intercalation Induced by Photocatalysis on the Surface of Hybrid Lead Halide Perovskites

Kong, Weiguang; Rahimi‐Iman, Arash; Bi, Gang; Dai, Xusheng; Wu, Huizhen

doi:10.1021/acs.jpcc.6b00496

Cited by 56 publications

(60 citation statements)

References 31 publications

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“…Similar formation of PbO x lead oxide is observed also for the films on glass (Figure 4 Recently Kong et al 48 reported that oxygen intercalation into the frameworks of , therefore a certain concentration of vacancies will be present. The evolution of Raman spectra is similar for the films in all substrates except that for PEDOT:PSS where PbO x phase cannot be identified, see Figure S7.…”

Section: Films On Different Substratessupporting

confidence: 68%

Influence of the substrate on the bulk properties of hybrid lead halide perovskite films

et al. 2016

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In addition to the known effect of substrate on interfacial properties of perovskite films, here we show that bulk properties of Hybrid Lead Halide Perovskite films depend on the type of substrate used for film growth. Despite the relative large film thickness, ~600 nm, the roughness and nature of the substrate layer (glass, FTO, TiO 2 and PEDOT:PSS) affect not just the degree of preferential orientation and crystal grain size Raman peaks.The irreversible photoluminescence enhancement observed at low power with illumination time, also dependent on the substrate nature, is proposed to be due to the localization of the electron-hole excitons created in the vicinity of the light generated defects. The results shed light into the performance of the perovskite layer and help understanding how bulk processes, where ion migration is a conspicuous example, are severely affected by interfacial properties as those imposed by the substrate.

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Section: Films On Different Substratessupporting

confidence: 68%

Influence of the substrate on the bulk properties of hybrid lead halide perovskite films

et al. 2016

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“…These observations indicate that the presence of oxygen and water vapor in air plays an important role, likely related to the photochemical reactions at the perovskite crystal surface. 40,46−49 A detailed discussion on this point can be found in a later section, where PL blinking under different environmental conditions is reported (Figure 6). …”

Section: Results and Discussionmentioning

confidence: 84%

Photoluminescence Blinking of Single-Crystal Methylammonium Lead Iodide Perovskite Nanorods Induced by Surface Traps

et al. 2016

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Photoluminescence (PL) of organometal halide perovskite materials reflects the charge dynamics inside of the material and thus contains important information for understanding the electro-optical properties of the material. Interpretation of PL blinking of methylammonium lead iodide (MAPbI3) nanostructures observed on polycrystalline samples remains puzzling owing to their intrinsic disordered nature. Here, we report a novel method for the synthesis of high-quality single-crystal MAPbI3 nanorods and demonstrate a single-crystal study on MAPbI3 PL blinking. At low excitation power densities, two-state blinking was found on individual nanorods with dimensions of several hundred nanometers. A super-resolution localization study on the blinking of individual nanorods showed that single crystals of several hundred nanometers emit and blink as a whole, without showing changes in the localization center over the crystal. Moreover, both the blinking ON and OFF times showed power-law distributions, indicating trapping–detrapping processes. This is further supported by the PL decay times of the individual nanorods, which were found to correlate with the ON/OFF states. Furthermore, a strong environmental dependence of the nanorod PL blinking was revealed by comparing the measurements in vacuum, nitrogen, and air, implying that traps locate close to crystal surfaces. We explain our observations by proposing surface charge traps that are likely related to under-coordinated lead ions and methylammonium vacancies to result in the PL blinking observed here.

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“…Despite the high device efficiency, solution process at a low cost, and potential for large‐scale manufacturing, the stability of the perovskite solar cells is one major challenge that impedes commercialization . Several factors that affect the stability of hybrid perovskites have been systematically investigated, such as humidity, oxygen, heat, and irradiation . When exposed to humidity, the perovskite hydrate CH 3 NH 3 PbI 3 · x H 2 O forms, driving the perovskite crystal decomposition to PbI 2 .…”

Section: Introductionmentioning

confidence: 99%

Exploring Red, Green, and Blue Light‐Activated Degradation of Perovskite Films and Solar Cells for Near Space Applications

et al. 2019

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Hybrid perovskite solar cells with a high specific power have great potential to become promising power sources mounted on spacecrafts in space applications. However, there is a lack of study on their photostability as light absorbers in those conditions. Herein, the stability of the perovskite films and solar cells under red, green, and blue (RGB) light illumination in medium vacuum that belongs to near space is explored. The perovskite active layers exhibit different degradations from morphological, chemical, and structural points of view. This is attributed to the strong coupling between photoexcited carriers and the crystal lattice and the diversity of RGB light absorption in the perovskite films. Device characterizations reveal that the efficiency loss of perovskite solar cells results from not only perovskite degradation, but also the photoexcited carriers reducing the energy barrier of ion migration and accelerating the migration to generate more deep‐level trap defects. Moreover, comparative devices suggest that the well encapsulation can weaken the effect of vacuum on stability.

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Oxygen Intercalation Induced by Photocatalysis on the Surface of Hybrid Lead Halide Perovskites

Cited by 56 publications

References 31 publications

Influence of the substrate on the bulk properties of hybrid lead halide perovskite films

Influence of the substrate on the bulk properties of hybrid lead halide perovskite films

Photoluminescence Blinking of Single-Crystal Methylammonium Lead Iodide Perovskite Nanorods Induced by Surface Traps

Exploring Red, Green, and Blue Light‐Activated Degradation of Perovskite Films and Solar Cells for Near Space Applications

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