Thermodynamically Self‐Healing 1D–3D Hybrid Perovskite Solar Cells

Thermal degradation in perovskite solar cells is still an unsettled issue that limits its further development. In this study, 2‐(1H‐pyrazol‐1‐yl)pyridine is introduced into lead halide 3D perovskites, which allows 1D–3D hybrid perovskite materials to be obtained. The heterostructural 1D–3D perovskit...

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Bibliographic Details
Published in:Advanced energy materials 2018-06, Vol.8 (16), p.n/a
Main Authors: Fan, Jiandong, Ma, Yunping, Zhang, Cuiling, Liu, Chong, Li, Wenzhe, Schropp, Ruud E. I., Mai, Yaohua
Format: Article
Language:English
Subjects:
1D–3D perovskites
Carrier recombination
Crystal growth
Current carriers
Energy conversion efficiency
Healing
Heterojunctions
Perovskites
Photoluminescence
Photovoltaic cells
photovoltaics
Relative humidity
self‐healing capability
Solar cells
Thermal degradation
thermal stability
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Summary:Thermal degradation in perovskite solar cells is still an unsettled issue that limits its further development. In this study, 2‐(1H‐pyrazol‐1‐yl)pyridine is introduced into lead halide 3D perovskites, which allows 1D–3D hybrid perovskite materials to be obtained. The heterostructural 1D–3D perovskites are proved to be capable of remarkably prolonging the photoluminescence decay lifetime and suppressing charge carrier recombination in comparison to conventional 3D perovskites. The intrinsic properties of thermodynamically stable yet kinetically labile 1D materials allow the system to alleviate the lattice mismatch and passivate the interface traps of heterojunction region of 1D–3D hybrid perovskites that may occur during the crystal growth process. Importantly, the as‐fabricated 1D–3D perovskite solar cells display a thermodynamic self‐healing ability, which is induced through blocking the ion‐migration channels of A‐site ions by the flexible 1D perovskite with less densely close‐packed structure. Particularly, the power conversion efficiency of as‐fabricated unencapsulated 1D–3D perovskite solar cells is demonstrated to be reversible under temperature cycling (25–85 °C) at 55% relative humidity, which largely outperforms the pure 3D perovskite solar cell. The present study provides a facile approach to fabricate 1D–3D perovskite solar cells with high efficiency and long‐term stability. 1D–3D hybrid perovskite is applied as absorber in a solar cell for the first time with remarkable thermodynamic self‐healing capability. The power conversion efficiency of as‐fabricated unencapsulated 1D–3D perovskite solar cells is demonstrated to be reversible under temperature cycling (25–85 °C) at 55% relative humidity, which largely outperforms the pure 3D perovskite solar cell.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201703421