石墨烯
材料科学
异质结
量子点
光电子学
电子迁移率
化学气相沉积
纳米技术
作者
Haosong Ying,Binbin Wei,Qing Zang,Jiduo Dong,Shouxin Zhang,Hao Tian,Chunheng Liu,Yang Liu
出处
期刊:Nanomaterials
[MDPI AG]
日期:2024-10-16
卷期号:14 (20): 1656-1656
摘要
The integration of PbS quantum dots (QDs) with graphene represents a notable advancement in enhancing the optoelectronic properties of quantum-dot-based devices. This study investigated the electrical transport properties of PbS quantum dot (QD)/graphene heterostructures, leveraging the high carrier mobility of graphene. We fabricated QD/graphene/SiO2/Si heterostructures by synthesizing p-type monolayer graphene via chemical vapor deposition and spin-coating PbS QDs on the surface. Then, we used a low-temperature electrical transport measurement system to study the electrical transport properties of the heterostructure under different temperature, gate voltage, and light conditions and compared them with bare graphene samples. The results indicated that the QD/graphene samples exhibited higher resistance than graphene alone, with both resistances slightly increasing with temperature. The QD/graphene samples exhibited significant hole doping, with conductivity increasing from 0.0002 Ω−1 to 0.0007 Ω−1 under gate voltage modulation. As the temperature increased from 5 K to 300 K, hole mobility decreased from 1200 cm2V−1s−1 to 400 cm2V−1s−1 and electron mobility decreased from 800 cm2V−1s−1 to 200 cm2V−1s−1. Infrared illumination reduced resistance, thereby enhancing conductivity, with a resistance change of about 0.4%/mW at a gate voltage of 125 V, demonstrating the potential of these heterostructures for infrared photodetector applications. These findings offer significant insights into the charge transport mechanisms in low-dimensional materials, paving the way for high-performance optoelectronic devices.
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