Carbon‐Electrode‐Tailored All‐Inorganic Perovskite Solar Cells To Harvest Solar and Water‐Vapor Energy

Duan, Jialong; Hu, T.; Zhao, Yuanyuan; He, Benlin; Tang, Qunwei

doi:10.1002/ange.201801837

Cited by 30 publications

(14 citation statements)

References 35 publications

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“…Unfortunately, the hybrid perovskites are susceptible to be degraded under thermal condition due to the volatility nature of the organic cations 7 – 9 . Replacing the volatile organic cations with inorganic Cs + can offer intrinsically thermal stable perovskite phase over 400 °C with a tunable bandgap between 1.73 eV of CsPbI 3 to 2.25 eV of CsPbBr 3 10 , 11 . Among various cesium halide perovskites, CsPbI 2 Br perovskite is considered to be a good candidate for the high efficiency and stable all-inorganic perovskite solar cells (PSCs) due to its reasonable Goldschmidt tolerance factor and the lower phase transition temperature with band gaps between 1.82 and 1.92 eV 12 , 13 .…”

Section: Introductionmentioning

confidence: 99%

Surface chelation of cesium halide perovskite by dithiocarbamate for efficient and stable solar cells

et al. 2020

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Surface engineering has been shown critical for the success of perovskite solar cells by passivating the surface enriched defects and mobile species. The discovery of surface modulators with superior interaction strength to perovskite is of paramount importance since they can retain reliable passivation under various environments. Here, we report a chelation strategy for surface engineering of CsPbI 2 Br perovskite, in which dithiocarbamate molecules can be coordinate to surface Pb sites via strong bidentate chelating bonding. Such chelated CsPbI 2 Br perovskite can realize excellent passivation of surface under-coordinated defects, reaching a champion power conversion efficiency of 17.03% and an open-circuit voltage of 1.37 V of CsPbI 2 Br solar cells. More importantly, our chelation strategy enabled excellent device stability by maintaining 98% of their initial efficiency for over 1400 h in ambient condition. Our findings provide scientific insights on the surface engineering of perovskite that can facilitate the further development and application of perovskite optoelectronics.

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Section: Introductionmentioning

confidence: 99%

Surface chelation of cesium halide perovskite by dithiocarbamate for efficient and stable solar cells

et al. 2020

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“…Wider-bandgap materials can provide higher photovoltages in the range required for water splitting. CsPbBr 3 for instance, a fully inorganic compound stable up to 500°C under N 2 , has an energy bandgap of 2.3 eV, and solar cells with very high open-circuit voltages have been reported [32][33][34][35][36][37][38][39][40] . For example, we have used CsPbBr 3 in mesoporous carbon solar cells to obtain efficiencies of 8.2% and open-circuit voltages up to 1.45 V 41 .…”

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confidence: 99%

Graphite-protected CsPbBr3 perovskite photoanodes functionalised with water oxidation catalyst for oxygen evolution in water

et al. 2019

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Metal-halide perovskites have been widely investigated in the photovoltaic sector due to their promising optoelectronic properties and inexpensive fabrication techniques based on solution processing. Here we report the development of inorganic CsPbBr 3 -based photoanodes for direct photoelectrochemical oxygen evolution from aqueous electrolytes. We use a commercial thermal graphite sheet and a mesoporous carbon scaffold to encapsulate CsPbBr 3 as an inexpensive and efficient protection strategy. We achieve a record stability of 30 h in aqueous electrolyte under constant simulated solar illumination, with currents above 2 mA cm −2 at 1.23 V RHE . We further demonstrate the versatility of our approach by grafting a molecular Ir-based water oxidation catalyst on the electrolyte-facing surface of the sealing graphite sheet, which cathodically shifts the onset potential of the composite photoanode due to accelerated charge transfer. These results suggest an efficient route to develop stable halide perovskite based electrodes for photoelectrochemical solar fuel generation.

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“…Among these methods, the generally accepted effective way is to replace the volatile organic group by inorganic cesium (Cs) cations to make a Cs-based all-inorganic perovskite (CsPe) light-absorption layer. For example, CsPe (CsPbX 3 , X = I, Br, Cl, or their mixture) based perovskite solar cells (PSCs) have shown remarkable stability under 80% humidity or 100 °C heating conditions [11,12]. The e ciency of CsPbX 3 is closely related to its halide composition, which leads to a change in its crystal structure, band gap, and humidity tolerance.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Light Absorption by Facile Patterning of Nano-grating on Mesoporous TiO2 Photoelectrode for Cesium Lead Halide Perovskite Solar Cells

Woo

Kim

Kwon

et al. 2020

Preprint

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CsPbIBr2, a type of cesium based all-inorganic halide perovskite (CsPe) composition, has been proposed as an alternative perovskite material against the mainstream organic–inorganic hybrid halide perovskite (HPe) materials owing to its exceptional humidity, thermal, temperature, and light stability. However, the low power conversion efficiency (PCE) due to its wide bandgap (2.05 eV) is an obstacle for its application in developing highly efficient solar cells. In this study, facile nanoimprinted one-dimensional grating nanopattern (1D GNP) formation on mesoporous TiO2 (mp-TiO2) photoelectrode has been introduced to improve the effective light utilization for enhancing the performance of CsPbIBr2 perovskite solar cells (PSCs). The 1D GNP structure on mp-TiO2 layer can not only increase the light absorption efficiency by diffracting the unabsorbed light into the mp-TiO2 and CsPbIBr2 active layer, but can also increase the charge separation and collection due to the enlarged interfacial contact area between the mp-TiO2 and CsPbIBr2 layers. Consequently, both current density (JSC) and fill factor (FF) of the fabricated cells were improved leading to over 20% improvement in their PCE. Thus, we conclude that this periodic grating structure, fabricated by simple solvent-assisted nanoimprinting, can play an important role in the realization of high-efficiency and low-cost Cs-based PSCs.

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Carbon‐Electrode‐Tailored All‐Inorganic Perovskite Solar Cells To Harvest Solar and Water‐Vapor Energy

Cited by 30 publications

References 35 publications

Surface chelation of cesium halide perovskite by dithiocarbamate for efficient and stable solar cells

Surface chelation of cesium halide perovskite by dithiocarbamate for efficient and stable solar cells

Graphite-protected CsPbBr3 perovskite photoanodes functionalised with water oxidation catalyst for oxygen evolution in water

Enhanced Light Absorption by Facile Patterning of Nano-grating on Mesoporous TiO2 Photoelectrode for Cesium Lead Halide Perovskite Solar Cells

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