Organic-inorganic halide perovskite-based thin film solar cells show excellent light-to-power conversion efficiency. The high performance for the devices requires the preparation of well-crystallized perovskite absorbers. In this paper, we used the postannealing process to treat the perovskite films under different solvent vapors and observed that the solvent vapors have a strong effect on the film growth. A model regarding the perovskite film growth was proposed as well. Intensive characterizations including scanning electron microscopy, electrochemical impedance spectroscopy, and admittance spectroscopy allowed us to attribute the improved performance to reduced recombination loss and defect density. Solar cell based on the DMSO-treated films delivered a power conversion efficiency of over 13% with negligible photocurrent hysteresis.

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Low-temperature, solution processed metal sulfide is introduced as an electron transport layer for perovskite solar cells.

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Flexible strain sensors have potential applications in electronic skin, healthcare monitor, human-machine interface, and other fields. The key limitation of the strain sensor for human motion monitoring is to meet...

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FA-based perovskite devices with reduced Pb contents were prepared.