Liu Shuai, Ren Feiyu, Dong Xinyuan, Zheng Diyuan, Niu Yiru, Jiao Lu, Tu Weiwei, Gan Zhikai, Wang Hui
Opt Lett. 2024 Jun 1;49(11):3126-3129. doi: 10.1364/OL.524723.
Graphene is a kind of two-dimensional material with a single-layer carbon structure and has been investigated in many high-performance photodetectors. The lateral photovoltaic effect (LPE) is widely used in the position-sensitive detectors (PSDs) owing to its linear response of photovoltage to the light position. In this Letter, a type of graphene-enhanced LPE is observed in the Ag nanoparticle-covered graphene/n-type Si. The LPE sensitivity can reach 97.3 mV/mm, much higher than the sensitivity of 1.3 mV/mm in the control sample of Ag/Si and 5.2 mV/mm of graphene/Si. Based on the photocarriers' diffusion mechanism, tailoring a photocarrier transfer at the interface of a heterojunction plays a key role for the enhancement. These findings exhibit great application potential of graphene in the field of PSDs and offer an effective method for the optimization of LPE devices.
石墨烯是一种具有单层碳结构的二维材料，已在许多高性能光电探测器中得到研究。横向光伏效应（LPE）因其光电压对光位置的线性响应而被广泛应用于位置敏感探测器（PSD）中。在本信函中，在银纳米颗粒覆盖的石墨烯/n型硅中观察到了一种石墨烯增强的LPE。LPE灵敏度可达97.3 mV/mm，远高于Ag/Si对照样品的1.3 mV/mm和石墨烯/Si的5.2 mV/mm的灵敏度。基于光载流子的扩散机制，在异质结界面处调整光载流子转移对增强效应起着关键作用。这些发现展示了石墨烯在PSD领域的巨大应用潜力，并为优化LPE器件提供了一种有效方法。
