Kar Sayani, Ghosh Surajit, Pal Tanusri
Optoelectronic Materials Lab, Department of Physics, Vidyasagar University, Midnapore, 721102, India.
Department of Physics, Midnapore College, Midnapore, 721101, India.
Sci Rep. 2024 Aug 12;14(1):18674. doi: 10.1038/s41598-024-69530-0.
We introduce an enhanced light-harvesting MoS-based nanocomposite exhibiting improved solar light induced photocurrent generation, both in solution and solid phases. The MoS-CdS composite was synthesized via easy to achieve, cost effective, two-step solution process for the photocatalytic potassium dichromate [Cr(VI)] reduction and photocurrent generation in thin-film optoelectronic devices. Incorporating 10 wt% MoS into the composite increased the degradation efficiency of CdS from 43.9 to 91.9%. Furthermore, the MoS-CdS composite demonstrated a 2.88-fold increase in the degradation rate constant and a 2.15% enhancement in the apparent quantum yield compared to controlled CdS. Additionally, the electrical power consumption per order decrease in Cr(VI) reduced from 25.74 kWh m for controlled CdS to 9 kWh m aimed at 10 wt% MoS-CdS composite, indicating optimal synergy between the counterparts of MoS-CdS in its composite. The resulting thin-film device with 10 wt% MoS-CdS exhibited robust photocurrent generation and nonlinear I-V characteristics under solar illumination, attributed to the unique electronic properties of the MoS-CdS heterojunction, influencing carrier transport via band alignment and interface carrier trapping effects. Moreover, photocurrent generation increased linearly with illumination intensity, and dynamic photo response studies revealed rapid photocurrent generation under illumination. Furthermore, the optoelectronic key parameters of CdS, including photosensitivity, photoresponsivity, and detectivity, were enhanced by factors of 5.09, 3.33, and 12.3, respectively, upon composite formation with MoS. This study offers novel insights into developing high-performance and cost-effective bimetallic sulfide photocatalysts for efficient solar light-induced photocurrent generation in both solution and solid phases.
我们介绍了一种增强型基于二硫化钼的光捕获纳米复合材料，该材料在溶液和固相阶段均表现出改善的太阳光诱导光电流产生。二硫化钼-硫化镉复合材料是通过易于实现且成本效益高的两步溶液法合成的，用于光催化重铬酸钾[Cr(VI)]还原以及薄膜光电器件中的光电流产生。将10 wt%的二硫化钼掺入复合材料中，使硫化镉的降解效率从43.9%提高到了91.9%。此外，与对照硫化镉相比，二硫化钼-硫化镉复合材料的降解速率常数提高了2.88倍，表观量子产率提高了2.15%。此外，对于10 wt%的二硫化钼-硫化镉复合材料，每降低一个Cr(VI)数量级的电能消耗从对照硫化镉的25.74 kWh/m³降至9 kWh/m³，这表明二硫化钼-硫化镉复合材料中各组分之间具有最佳协同作用。所得含10 wt%二硫化钼-硫化镉的薄膜器件在太阳光照射下表现出强劲的光电流产生和非线性I-V特性，这归因于二硫化钼-硫化镉异质结的独特电子特性，通过能带排列和界面载流子俘获效应影响载流子传输。此外，光电流产生随光照强度线性增加，动态光响应研究表明在光照下能快速产生光电流。此外，与二硫化钼复合后，硫化镉的光电关键参数，包括光敏性、光响应度和探测率，分别提高了5.09倍、3.33倍和12.3倍。这项研究为开发高性能、低成本的双金属硫化物光催化剂提供了新的见解，以在溶液和固相阶段实现高效的太阳光诱导光电流产生。
