Wire on well (WoW) structure, which is formed on a vicinal substrate, has been under consideration for a bandgap adjustor of multijunction cells. The photocurrent of a single-junction cell containing WoW is higher than that of a cell containing planar superlattice (PSL). This work provides direct evidence for the superiority of WoW over PSL in terms of the transport of photogenerated carriers. The time of flight (ToF) of the carriers that were photoexcited near the top surface of a cell was measured with photoluminescence by embedding a probe well beneath the nanostructures (WoW or PSL). The effective mobility of carriers in the nanostructures was obtained from the relationship between the ToF and the electric field applied via external bias. It was revealed that the carrier mobility in WoW was higher than that of PSL. The merit of enhanced mobility for WoW is discussed with device simulation and the potential for higher conversion efficiency is evidenced.

中文翻译：

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使用飞行时间测量比较井上导线与平面超晶格之间的有效载流子迁移率

形成在相邻基板上的阱上线 (WoW) 结构已被考虑用于多结电池的带隙调节器。包含 WoW 的单结电池的光电流高于包含平面超晶格 (PSL) 的电池的光电流。这项工作为 WoW 在光生载流子传输方面优于 PSL 提供了直接证据。通过在纳米结构（WoW 或 PSL）下方嵌入探针，用光致发光测量在细胞顶面附近光激发的载流子的飞行时间 (ToF)。纳米结构中载流子的有效迁移率是从 ToF 与通过外部偏置施加的电场之间的关系获得的。结果表明，WoW 中的载流子迁移率高于 PSL。