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Enhanced Piezoelectricity of MAPbI3 by the Introduction of MXene and Its Utilization in Boosting High-Performance Photodetectors
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DOI：10.1002/adma.202313288.png)
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Abstract
En 中文
Recently, perovskite photodetectors (PDs) are risen to prominence due to substantial research interest. Beyond merely tweaking the composition of materials, a cutting-edge advancement lies in leveraging the innate piezoelectric polarization properties of perovskites themselves. Here, the investigation shows utilizing Ti3C2Tx, a typical MXene, as an intermediate layer for significantly boosting the piezoelectric property of MAPbI(3) thin films. This improvement is primarily attributed to the enhanced polarization of the methylammonium (MA(+)) groups within MAPbI(3), induced by the OH groups present in Ti3C2Tx. A flexible PD based on the MAPbI(3)/MXene heterostructure is then fabricated. The new device is sensitive to a wide range of wavelengths, displays greatly enhanced performance owing to the piezo-phototronic coupling. Moreover, the device is endowed with a greatly reduced response time, down to millisecond level, through the pyro-phototronic effect. The characterization shows applying a -1.2% compressive strain on the PD leads to a remarkable 102% increase in the common photocurrent, and a 76% increase in the pyro-phototronic current. The present work reveals how the emerging piezo-phototronic and pyro-phototronic effects can be employed to design high-performance flexible perovskite PDs.
Keywords:
MAPbI(3)
MXene
photodetectors
piezoelectricity
piezo-phototronic effect
pyro-phototronic effect
Journal
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26.8
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3.4W
Citations:
46.0W