用于薄膜光电子器件的吸收光子晶体
Absorbing photonic crystals for thin film photovoltaics
摘要：
薄氢化非晶硅层的吸收可以通过受控的周期性图案化来有效地增强。光通过与周期结构的光子布洛赫模耦合而被捕获，周期结构充当吸收平面光子晶体。我们从理论上证明了这种吸收增强通过一维或二维图案，并通过大面积全息图案显示实验的可行性。数值模拟表明，在380和750 nm之间的太阳光谱部分上，吸收增强超过50%。通过对激光全息和反应离子刻蚀制备的平面光子晶体进行光学测量，实验证实了这一点。
英文摘要：
The absorption of thin hydrogenated amorphous silicon layers can be efficiently enhanced through a controlled periodic patterning. Light is trapped through coupling with photonic Bloch modes of the periodic structures, which act as an absorbing planar photonic crystal. We theoretically demonstrate this absorption enhancement through one or two dimensional patterning, and show the experimental feasibility through large area holographic patterning. Numerical simulations show over 50% absorption enhancement over the part of the solar spectrum comprised between 380 and 750nm. It is experimentally confirmed by optical measurements performed on planar photonic crystals fabricated by laser holography and reactive ion etching.
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