Design and simulation of type-I graphene/Si quantum dot superlattice for intermediate-band solar cell applications.

IF 4.1 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Masumeh Sarkhoush, Hassan Rasooli Saghai, Hadi Soofi
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引用次数: 1

Abstract

Recent experiments suggest graphene-based materials as candidates for use in future electronic and optoelectronic devices. In this study, we propose a new multilayer quantum dot (QD) superlattice (SL) structure with graphene as the core and silicon (Si) as the shell of QD. The Slater-Koster tight-binding method based on Bloch theory is exploited to investigate the band structure and energy states of the graphene/Si QD. Results reveal that the graphene/Si QD is a type-I QD and the ground state is 0.6 eV above the valance band. The results also suggest that the graphene/Si QD can be potentially used to create a sub-bandgap in all Si-based intermediate-band solar cells (IBSC). The energy level hybridization in a SL of graphene/Si QDs is investigated and it is observed that the mini-band formation is under the influence of inter-dot spacing among QDs. To evaluate the impact of the graphene/Si QD SL on the performance of Si-based solar cells, we design an IBSC based on the graphene/Si QD (QDIBSC) and calculate its short-circuit current density (Jsc) and carrier generation rate (G) using the 2D finite difference time domain (FDTD) method. In comparison with the standard Si-based solar cell which records Jsc = 16.9067 mA/cm2 and G = 1.48943 × 1028 m-3⋅s-1, the graphene/Si QD IBSC with 2 layers of QDs presents Jsc = 36.4193 mA/cm2 and G = 7.94192 × 1028 m-3⋅s-1, offering considerable improvement. Finally, the effects of the number of QD layers (L) and the height of QD (H) on the performance of the graphene/Si QD IBSC are discussed.

Abstract Image

Abstract Image

Abstract Image

用于中波段太阳能电池的i型石墨烯/硅量子点超晶格的设计与仿真。
最近的实验表明,石墨烯基材料是未来电子和光电子器件的候选材料。在这项研究中,我们提出了一种新的多层量子点(QD)超晶格(SL)结构,石墨烯为核心,硅(Si)为QD的壳层。利用基于Bloch理论的Slater-Koster紧密结合方法研究了石墨烯/硅量子点的能带结构和能态。结果表明,石墨烯/硅量子点为i型量子点,基态在价带以上0.6 eV。结果还表明,石墨烯/硅量子点可以潜在地用于在所有硅基中间带太阳能电池(IBSC)中创建子带隙。研究了石墨烯/硅量子点的能级杂化,发现量子点之间的点间距对小能带的形成有影响。为了评估石墨烯/硅QD SL对硅基太阳能电池性能的影响,我们设计了一个基于石墨烯/硅QD (QDIBSC)的IBSC,并使用二维时域有限差分(FDTD)方法计算了其短路电流密度(Jsc)和载流子生成率(G)。与标准硅基太阳能电池的Jsc = 16.9067 mA/cm2和G = 1.48943 × 1028 m-3⋅s-1相比,具有2层量子点的石墨烯/硅QD IBSC的Jsc = 36.4193 mA/cm2和G = 7.94192 × 1028 m-3⋅s-1有了较大的提高。最后,讨论了量子点层数(L)和量子点高度(H)对石墨烯/硅量子点IBSC性能的影响。
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来源期刊
Frontiers of Optoelectronics
Frontiers of Optoelectronics ENGINEERING, ELECTRICAL & ELECTRONIC-
CiteScore
7.80
自引率
0.00%
发文量
583
期刊介绍: Frontiers of Optoelectronics seeks to provide a multidisciplinary forum for a broad mix of peer-reviewed academic papers in order to promote rapid communication and exchange between researchers in China and abroad. It introduces and reflects significant achievements being made in the field of photonics or optoelectronics. The topics include, but are not limited to, semiconductor optoelectronics, nano-photonics, information photonics, energy photonics, ultrafast photonics, biomedical photonics, nonlinear photonics, fiber optics, laser and terahertz technology and intelligent photonics. The journal publishes reviews, research articles, letters, comments, special issues and so on. Frontiers of Optoelectronics especially encourages papers from new emerging and multidisciplinary areas, papers reflecting the international trends of research and development, and on special topics reporting progress made in the field of optoelectronics. All published papers will reflect the original thoughts of researchers and practitioners on basic theories, design and new technology in optoelectronics. Frontiers of Optoelectronics is strictly peer-reviewed and only accepts original submissions in English. It is a fully OA journal and the APCs are covered by Higher Education Press and Huazhong University of Science and Technology. ● Presents the latest developments in optoelectronics and optics ● Emphasizes the latest developments of new optoelectronic materials, devices, systems and applications ● Covers industrial photonics, information photonics, biomedical photonics, energy photonics, laser and terahertz technology, and more
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