AI Article Synopsis
- This study focuses on enhancing the efficiency and stability of hybrid organic-inorganic halide perovskite solar cells by examining the effects of lattice distortion caused by residual stress in thin films.
- A novel method involving A site cation alloying is introduced to relieve surface stress, leading to beneficial lattice reconstruction and reduced elastic modulus within the films.
- The resulting solar devices achieve an impressive efficiency of 21.48%, demonstrating strong humidity stability and improved thermal cycling resistance.
Article Abstract
To improve the photovoltaic performance (both efficiency and stability) in hybrid organic-inorganic halide perovskite solar cells, perovskite lattice distortion is investigated with regards to residual stress (and strain) in the polycrystalline thin films. It is revealed that residual stress is concentrated at the surface of the as-prepared film, and an efficient method is further developed to release this interfacial stress by A site cation alloying. This results in lattice reconstruction at the surface of polycrystalline thin films, which in turn results in low elastic modulus. Thus, a "bone-joint" configuration is constructed within the interface between the absorber and the carrier transport layer, which improves device performance substantially. The resultant photovoltaic devices exhibit an efficiency of 21.48% with good humidity stability and improved resistance against thermal cycling.
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| http://dx.doi.org/10.1002/adma.201904408 | DOI Listing |
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