期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 48, 页码 32934-32939出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b10305
关键词
ultrabroadband; photodetector; self-powered; ferroelectric; pyroelectric
资金
- National key Basic Research Program of China (973 Program) [2013CB632900]
- National Science Foundation of China [91333109]
- Tsinghua University Initiative Scientific Research Program [20131089202, 20161080165]
- Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics [KF201516]
Photodetectors capable of detecting two or more bands simultaneously with a single system have attracted extensive attentions because of their critical applications in image sensing, communication, and so on. Here, we demonstrate a self-powered ultrabroadband photodetector monolithically integrated on a 0.72Pb(Mg1/3Nb2/3)O-3-0.28PbTiO(3) (PMN-28PT) single crystal. By combining the optothermal and pyroelectric effect, the multifunctional PMN-28PT single crystal can response to a wide wavelength range from UV to terahertz (THz). At room temperature, the photodetector could generate a pyroelectric current under the intermittent illumination of incident light in absence of external bias. A systematic study of the photoresponse was investigated. The pyroelectric current shows an almost linear relationship to illumination intensity. Benefiting from the excellent pyroelectric property of PMN-28PT single crystal and the optimized device architecture, the device exhibited a dramatic improvement in operation frequency up to 3 kHz without any obvious degradation in sensitivity. Such a self-powered photodetector with ultrabroadband response may open a window for the novel application of ferroelectric materials in optoelectronics.
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