Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 6, Issue 46, Pages 12714-12720Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc04691c
Keywords
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Funding
- Natural Science Foundation of China [61722408, 61574151, 61574152, 61474131, 61674158]
- Major State Basic Research Development Program [2016YFA0203900, 2016YFB0400801]
- Key Research Project of Frontier Sciences of Chinese Academy of Sciences [QYZDB-SSW-JSC016, QYZDY-SSW-JSC042]
- Natural Science Foundation of Shanghai [16ZR1447600, 17JC1400302]
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The purpose of this research was to understand the effect of a built-in ferroelectric field on the performance of two-dimensional (2D) lead-free perovskite material-based phototransistor applications. In this work, ferroelectric polymer poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) and two-dimensional (2D) lead-free perovskite ((C6H5C2H4NH3)(2)SnI4) were utilized as a dielectric layer and a channel layer, respectively. We observed that large hysteresis was successfully eliminated in the transfer curve, as well as the subthreshold swing being significantly reduced by one order of magnitude after P(VDF-TrFE) was introduced as a dielectric layer. Under polarization up and down states, the device achieved a high photo-switching on/off ratio (>100) and a short photoresponse time (50 ms), respectively. In addition to that, the device also demonstrated a high responsivity of 14.57 A W-1 and a high detectivity of 1.74 x 10(12) Jones under the polarization up state with an illumination intensity of 21 W cm(-2). In addition, low temperature solution-processed P(VDF-TrFE) and (C6H5C2H4NH3)(2)SnI4 (except for the contacts of Au electrodes) in this work are considered to be suitable and compatible for flexible-based phototransistor applications in the future.
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