Mu Xinbo, Su Jinbao, Zhou Wenjuan, Chang Pengying, Deng Jun, Liu Ying, Ma Zhengtai, Xie Yiyang
Key Laboratory of Optoelectronics Technology, Beijing University of Technology, Ministry of Education, Beijing 100124, China.
Nanomaterials (Basel). 2025 Jan 28;15(3):207. doi: 10.3390/nano15030207.
Graphene-based photodetectors exhibit relatively low spectral absorption and rapid recombination of photogenerated carriers, which can limit their response performance. On the other hand, nanostructured lead sulfide (PbS) demonstrates a wide spectral absorption range from visible to near-infrared light. High-quality and evenly distributed PbS nanofilms were synthesized by chemical bath deposition and were applied to a graphene-PbS heterostructure photodetector. The heterostructure creates an inherent electric field that extends the lifetime of photogenerated carriers, leading to enhanced device response. We achieved a high-responsivity graphene-PbS photodetector by combining the high carrier mobility of graphene and the strong infrared absorption of PbS. The photodetector exhibits a responsivity of 72 A/W at 792 nm and 5.8 A/W at 1550 nm, with a response time of less than 20 ms. The optimized device features a broad spectral response ranging from 265 nm to 2200 nm.
基于石墨烯的光电探测器表现出相对较低的光谱吸收率以及光生载流子的快速复合，这会限制它们的响应性能。另一方面，纳米结构的硫化铅（PbS）展现出从可见光到近红外光的宽光谱吸收范围。通过化学浴沉积合成了高质量且分布均匀的PbS纳米薄膜，并将其应用于石墨烯-PbS异质结构光电探测器。该异质结构产生了一个固有电场，延长了光生载流子的寿命，从而提高了器件响应。通过结合石墨烯的高载流子迁移率和PbS的强红外吸收，我们实现了一种高响应性的石墨烯-PbS光电探测器。该光电探测器在792nm处的响应度为72A/W，在1550nm处为5.8A/W，响应时间小于20ms。优化后的器件具有从265nm到2200nm的宽光谱响应。
