Enhanced Photostability of “Hollow” Mixed Halide Wide-Bandgap Perovskite Films

Kim, Daehan; Safdari, Majid; Lee, Seung Won; Liu, Cheng; Yang, Yi; Namgung, Seok Daniel; Sargent, Edward H.; Hersam, Mark C.; Kim, Dong-Hwan; Kanatzidis, Mercouri G.

doi:10.1021/acsenergylett.3c02104

Cited by 2 publications

(3 citation statements)

References 49 publications

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“…Introducing bromide salts with moderate chain lengths, such as phenylammonium bromide [PhABr], phenymethylammonium bromide [PMABr], and phenylethylammonium bromide [PEABr], into FA 0.75 MA 0.15 Cs 0.1 PbI 2 Br has enhanced the stability of the corresponding device under constant illumination. The addition of small concentrations did not alter any structural or optoelectronic properties but exhibited a passivation effect that suppressed halide segregation. , …”

Section: Tolerance Factormentioning

confidence: 93%

“…In another study, Zhou et al reported that the crystallinity of wide bandgap perovskites can be improved by manipulating the antisolvent addition process, which is a pathway to suppress halide segregation . Structural modification to “hollow” perovskites is another strategy that improves the photostability of perovskite solar cells . Doping of small quantities of organic cations has proven effective in reducing halide segregation.…”

Section: Tolerance Factormentioning

confidence: 99%

“…Another factor is the variation of the cationic size and shape in the perovskite framework originating from dimethylammonium substitution which eventually leads to a different position for the cationic center of mass. These two structural alternations lead to a higher activation energy barrier for ion migration, hence a higher energy barrier for halide segregation. ,− …”

Section: Tolerance Factormentioning

confidence: 99%

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Mitigation of Halide Segregation by Cation Composition Management in Wide Bandgap Perovskites

Safdari,

Kim,

Balvanz

et al. 2024

ACS Energy Lett.

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Light-induced phase segregation poses challenges for the application of mixed-halide hybrid perovskites in photovoltaics, causing voltage deficits. Here, we investigate the role of chemical composition in improving the photostability of wide bandgap mixed-halide perovskites. We partially substituted the formamidinium cation in the composition of (Cs 0.17 FA 0.83 )Pb(Br 0.2 I 0.8 ) 3 with seven alternative cations to achieve a slight blue shift in the bandgap, typically achieved by increasing bromide content. Among alternative cations, dimethylammonium (DMA) and acetamidinium (Ac) induced greater blue shifts at 10% concentration without forming a new low-dimensional second phase. Photoluminescence studies, which analyzed the halide segregation induced by high-power laser irradiation of all new compositions, revealed reduced phase segregation for DMA and Ac compositions. Further adjustments, e.g., increased cesium content, effectively compensated for the lower bromide content in the bandgap while enhancing light stability. Among all compositions, Cs 0.25 FA 0.65 DMA 0.1 Pb(Br 0.2 I 0.8 ) 3 exhibited enhanced photostability. These findings highlight the potential of structural modifications to produce highly stable compositions with the desired bandgap, paving the way for the development of stable perovskite solar cells.

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Section: Tolerance Factormentioning

confidence: 93%

Section: Tolerance Factormentioning

confidence: 99%

Section: Tolerance Factormentioning

confidence: 99%

See 1 more Smart Citation

Mitigation of Halide Segregation by Cation Composition Management in Wide Bandgap Perovskites

Safdari,

Kim,

Balvanz

et al. 2024

ACS Energy Lett.

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Recent Advances in Structure Design and Application of Metal Halide Perovskite-Based Gas Sensor

Zhou,

Tang,

Zhu

et al. 2024

ACS Sens.

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Metal halide perovskites (MHPs) are emerging gas-sensing materials and have attracted considerable attention in gas sensors due to their unique bandgap structure and tunable optoelectronic properties. The past decade has witnessed significant developments in the gas-sensing field; however, their intrinsic structural instability and ambiguous gas-sensing mechanisms hamper their practical applications. Herein, we summarize the recent advances in MHP-based gas sensors. The physicochemical properties of MHPs are discussed at first. The structure design, including dimension design and engineering design, is overviewed as well as their fabrication methods, and we put forward our insights into the gas-sensing mechanism of MHPs. It is believed that enhanced understanding of gas-sensing mechanisms of MHPs are helpful for their application as gas-sensing materials, and structure design can enhance their stability, sensing sensitivity, and selectivity to target gases as gas sensors. Subsequently, the latest developments in MHP-based gas sensors are summarized according to their different application scenarios. Finally, we conclude with the current status and challenges in this field and propose future perspectives.

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Enhanced Photostability of “Hollow” Mixed Halide Wide-Bandgap Perovskite Films

Cited by 2 publications

References 49 publications

Mitigation of Halide Segregation by Cation Composition Management in Wide Bandgap Perovskites

Mitigation of Halide Segregation by Cation Composition Management in Wide Bandgap Perovskites

Recent Advances in Structure Design and Application of Metal Halide Perovskite-Based Gas Sensor

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