Interlayer of PMMA doped with Au nanoparticles for high-performance tandem photodetectors: a solution to suppress dark current and maintain high photocurrent.
ACS applied materials & interfaces(2020)
摘要
Currently, colloidal quantum dots (CQDs) based photodetectors are widely investigated due to their low cost and easy integration with optoelectronic devices. The requirements for a high-performance photodetector are the low dark current and the high photocurrent. Normally, photodetectors with low dark-current also possess low photocurrent, or photodetectors with reduced dark-current and possess reduced photocurrent, resulting to low detectivity. In this paper, a solution to suppress dark current and maintain high photocurrent, i.e. by using polymethyl methacrylate doped with Au nanoparticles (NPs) (i.e. PMMA:Au) as the interlayer for enhanced-performance tandem photodetectors, is presented. Our experimental data showed that the dark current through the tandem photodetector ITO/PEDOT:PSS/PbS:CsSnBr3/ ZnO/PMMA:Au/CuSeN/PbS:CsSnBr3/ZnO/Ag is suppressed significantly, meanwhile the photocurrent is maintained high, after inserting the PMMA:Au interlayer between the two sub-detectors. The inserted PMMA:Au interlayer acts as the storage nodes for electrons, reducing the dark current through the device meanwhile the photocurrent can be enhanced under illumination. As a result, the specific detectivity of the tandem photodetector with 35 nm PMMA:Au interlayer was enhanced significantly from 5.01×1012 to 2.7×1015 Jones under 300 μW/cm2 532 nm illumination at low voltage of -1 V as compared to the control device without the PMMA:Au interlayer. Further, the physical mechanism for the enhanced performance is discussed in details.
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关键词
tandem photodetectors,solution-processed,PbS colloidal quantum dots (CQDs),CsSnBr3 perovskites,interlayer,low dark current
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