Strain-engineered artificial atom as a broad-spectrum solar energy funnel
Strain-engineered artificial atom as a broad-spectrum solar energy funnel
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应变工程人造原子作为广谱太阳能漏斗
DOI：
10.1038/nphoton.2012.285
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发表时间：
2012-12-01
期刊：
影响因子：
35
通讯作者：
Li, Ju
中科院分区：
文献类型：
--
作者：
Feng, Ji;Qian, Xiaofeng;Li, Ju
一种具有空间可调带隙的光电材料非常适合用于光伏、光催化和光检测。弹性应变有可能被用来实现快速和可逆的带隙调谐。然而，由于塑性或断裂，传统材料不能承受足够高的弹性应变来产生足够的物理特性变化。最近，一类新兴的材料--被称为超强材料--被证明可以避免高达理想强度的很大一部分的非弹性松弛。在这里，我们从理论上和计算上证明了弹性应变是在初始均匀的原子薄膜中产生连续变化的带隙分布的一个可行的因素。我们提出，由应变工程MoS2单分子膜制成的光伏器件将捕获广泛的太阳光谱，并集中激子或电荷载流子。
An optoelectronic material with a spatially varying bandgap that is tunable is highly desirable for use in photovoltaics, photocatalysis and photodetection. Elastic strain has the potential to be used to achieve rapid and reversible tuning of the bandgap. However, as a result of plasticity or fracture, conventional materials cannot sustain a high enough elastic strain to create sufficient changes in their physical properties. Recently, an emergent class of materials—named ‘ultrastrength materials’—have been shown to avoid inelastic relaxation up to a significant fraction of their ideal strength. Here, we illustrate theoretically and computationally that elastic strain is a viable agent for creating a continuously varying bandgap profile in an initially homogeneous, atomically thin membrane. We propose that a photovoltaic device made from a strain-engineered MoS2monolayer will capture a broad range of the solar spectrum and concentrate excitons or charge carriers.