Abstract
The monolithic integration of new optoelectronic materials with well-established inexpensive silicon circuitry is leading to new applications, functionality and simple readouts. Here, we show that single crystals of hybrid perovskites can be integrated onto virtually any substrates, including silicon wafers, through facile, low-temperature, solution-processed molecular bonding. The brominated (3-aminopropyl)triethoxysilane molecule binds the native oxide of silicon and participates in the perovskite crystal with its ammonium bromide group, yielding a solid mechanical and electrical connection. The dipole of the bonding molecule reduces device noise while retaining signal intensity. The reduction of dark current enables the detectors to be operated at increased bias, resulting in a sensitivity of 2.1 × 104 µC Gyair−1 cm−2 under 8 keV X-ray radiation, which is over a thousand times higher than the sensitivity of amorphous selenium detectors. X-ray imaging with both perovskite pixel detectors and linear array detectors reduces the total dose by 15–120-fold compared with state-of-the-art X-ray imaging systems.
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Acknowledgements
This X-ray detector development and characterization work was financially supported by the Defense Threat Reduction Agency under award no. HDTRA1-14-1-0030. The KPFM study was supported financially by the National Science Foundation under awards DMR-1505535 and DMR-1420645. The authors thank S. Banerjee and D. Haden for discussions regarding X-ray dose rate calibration, and S. Valloppilly for his assistance in using the X-ray source in the XRD system (Rigaku Multiflex) for X-ray imaging.
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J.H. conceived and supervised the project. W.W. synthesized materials and fabricated the devices. Y.Z. and W.W. conducted the X-ray imaging measurements. H.W. measured the photodetector performance. Q.X. and L.C. measured the device performance under 50 keV X-ray radiation. Y.F. performed the photoluminescence lifetime measurement. T.L. and A.G. performed the KPFM measurement. Y.D. conducted SEM and XRD experiments. Q.W. carried out the TEM measurement. All authors analysed the data. J.H. wrote the manuscript and all authors reviewed the manuscript.
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Wei, W., Zhang, Y., Xu, Q. et al. Monolithic integration of hybrid perovskite single crystals with heterogenous substrate for highly sensitive X-ray imaging. Nature Photon 11, 315–321 (2017). https://doi.org/10.1038/nphoton.2017.43
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DOI: https://doi.org/10.1038/nphoton.2017.43
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