Kim M-H, Yan J, Suess R J, Murphy T E, Fuhrer M S, Drew H D
Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA.
Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA and Physics Department, University of Massachusetts, Amherst, Massachusetts 01002, USA.
Phys Rev Lett. 2013 Jun 14;110(24):247402. doi: 10.1103/PhysRevLett.110.247402.
The photovoltaic and bolometric photoresponse in gapped bilayer graphene was investigated by optical and transport measurements. A pulse coincidence technique at 1.5 μm was used to measure the response times as a function of temperature. The bolometric and photovoltaic response times were found to be identical implying that the photovoltaic response is also governed by hot electron thermal relaxation. Response times of τ ∼ 100-20 ps were found for temperatures from 3-100 K. Above 10 K, the relaxation time was observed to be τ = 25 ± 5 ps, independent of temperature within noise.
通过光学和输运测量研究了带隙双层石墨烯中的光伏和热辐射光响应。使用1.5μm的脉冲符合技术测量响应时间随温度的变化。发现热辐射和光伏响应时间相同，这意味着光伏响应也受热电子热弛豫支配。在3 - 100K的温度范围内，响应时间为τ ∼ 100 - 20ps。在10K以上，观察到弛豫时间为τ = 25 ± 5ps，在噪声范围内与温度无关。
