光电流
异质结
超晶格
太阳能电池
多激子产生
饱和(图论)
光电子学
量子效率
光子
光电导性
光子能量
物理
量子极限
凝聚态物理
材料科学
量子
光学
量子力学
数学
组合数学
作者
Kenneth M. Hughes,Megumi Ito,Anthony Vaquero-Stainer,Nicholas J. Ekins‐Daukes,Chris C. Phillips
摘要
A quantum ratchet intermediate band solar cell based on a quantum well superlattice is investigated. The design is similar to that of a previously reported device, but it employs a stronger built-in electric field across the heterojunction; therefore, it works at higher illumination intensities before the photocurrent saturates due to photocarrier accumulation screening out the field and causing leveling of the bands. In this present device, saturation of the two-photon photocurrent occurred at a valence-to-intermediate band pulse energy of ∼4 nJ, approximately ten times greater than the previously reported device, making it more suitable for concentrator applications.
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