Water assisted formation of highly oriented CsPbI<sub>2</sub>Br perovskite films with the solar cell efficiency exceeding 16%

“…When the temperature was increased to 45 °C, the average crystal size dropped quickly to 272 nm. The perovskite thin films were demonstrated to have various grain sizes [ 35 , 36 ], which were associated with different crystal growth dynamics and growth techniques. The effect of grain size on photovoltaic performance was studied.…”

Section: Resultsmentioning

confidence: 99%

Ambient Air Temperature Assisted Crystallization for Inorganic CsPbI2Br Perovskite Solar Cells

Liu

Zhang

et al. 2021

Molecules

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Inorganic cesium lead halide perovskites, as alternative light absorbers for organic–inorganic hybrid perovskite solar cells, have attracted more and more attention due to their superb thermal stability for photovoltaic applications. However, the humid air instability of CsPbI2Br perovskite solar cells (PSCs) hinders their further development. The optoelectronic properties of CsPbI2Br films are closely related to the quality of films, so preparing high-quality perovskite films is crucial for fabricating high-performance PSCs. For the first time, we demonstrate that the regulation of ambient temperature of the dry air in the glovebox is able to control the growth of CsPbI2Br crystals and further optimize the morphology of CsPbI2Br film. Through controlling the ambient air temperature assisted crystallization, high-quality CsPbI2Br films are obtained, with advantages such as larger crystalline grains, negligible crystal boundaries, absence of pinholes, lower defect density, and faster carrier mobility. Accordingly, the PSCs based on as-prepared CsPbI2Br film achieve a power conversion efficiency of 15.5% (the maximum stabilized power output of 15.02%). Moreover, the optimized CsPbI2Br films show excellent robustness against moisture and oxygen and maintain the photovoltaic dark phase after 3 h aging in an air atmosphere at room temperature and 35% relative humidity (R.H.). In comparison, the pristine films are completely converted to the yellow phase in 1.5 h.

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“…To date, intensive efforts have been devoted to developing the strategies for preparing high‐quality inorganic perovskite film. [ 24–27 ] Among various strategies, additive engineering has been of specific interest and well developed for ease of operation. [ 19,28–33 ] Nevertheless, different perovskites clearly require different regulations.…”

Section: Introductionmentioning

confidence: 99%

S₈ Additive Enables CsPbI₂Br Perovskite with Reduced Defects and Improved Hydrophobicity for Inverted Solar Cells

Yuan

Han

et al. 2021

Solar RRL

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Though prized for excellent thermal stability, inorganic perovskites are still behind organic/inorganic hybrid perovskites due to their high‐density defects and poor hydrophobicity. Herein, trace hydrophobic S8 is used as additive to optimize the solution‐processed CsPbI2Br perovskite film. A series of characterizations reveal that S8 additive not only leads to retarded crystallization of α‐CsPbI2Br perovskite at low temperature (<150 °C) via self‐formed Pb(S8)x2+ intermediate but also induces efficient grain‐boundary passivation via distinctive PbS coordination interaction and reduced wettability on perovskite surface, which all point to the formation of the perovskite film with reduced defects and improved hydrophobicity. As a result, the inverted perovskite solar cells (PSCs) based on the optimized all‐inorganic perovskite of CsPbI2Br:S8 deliver an increased power conversion efficiency (PCE) from 12.76% to 14.46% as well as remarkably enhanced device stability under thermal or ambient condition. This work thus provides a simple way as well as new insights for boosting the performance of solution‐processed all‐inorganic perovskite.

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Water assisted formation of highly oriented CsPbI₂Br perovskite films with the solar cell efficiency exceeding 16%

Abstract: Cesium lead halide perovskites are promising alternatives as light-absorbing materials for perovskite solar cells with excellent thermal stability, but their inferior power conversion efficiency (PCE) and ambient instability are impeding...

Cited by 43 publications

References 34 publications

Strain relaxation and domain enlargementviaphase transition towards efficient CsPbI₂Br solar cells

Strain relaxation and domain enlargementviaphase transition towards efficient CsPbI₂Br solar cells

Ambient Air Temperature Assisted Crystallization for Inorganic CsPbI2Br Perovskite Solar Cells

S₈ Additive Enables CsPbI₂Br Perovskite with Reduced Defects and Improved Hydrophobicity for Inverted Solar Cells

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Water assisted formation of highly oriented CsPbI2Br perovskite films with the solar cell efficiency exceeding 16%

Abstract: Cesium lead halide perovskites are promising alternatives as light-absorbing materials for perovskite solar cells with excellent thermal stability, but their inferior power conversion efficiency (PCE) and ambient instability are impeding...

Cited by 43 publications

References 34 publications

Strain relaxation and domain enlargementviaphase transition towards efficient CsPbI2Br solar cells

Strain relaxation and domain enlargementviaphase transition towards efficient CsPbI2Br solar cells

Ambient Air Temperature Assisted Crystallization for Inorganic CsPbI2Br Perovskite Solar Cells

S8 Additive Enables CsPbI2Br Perovskite with Reduced Defects and Improved Hydrophobicity for Inverted Solar Cells

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Water assisted formation of highly oriented CsPbI₂Br perovskite films with the solar cell efficiency exceeding 16%

Strain relaxation and domain enlargementviaphase transition towards efficient CsPbI₂Br solar cells

Strain relaxation and domain enlargementviaphase transition towards efficient CsPbI₂Br solar cells

S₈ Additive Enables CsPbI₂Br Perovskite with Reduced Defects and Improved Hydrophobicity for Inverted Solar Cells