標題: Impact of silicon quantum dot super lattice and quantum well structure as intermediate layer on p-i-n silicon solar cells
作者: Rahman, Mohammad Maksudur
Lee, Ming-Yi
Tsai, Yi-Chia
Higo, Akio
Sekhar, Halubai
Igarashi, Makoto
Syazwan, Mohd Erman
Hoshi, Yusuke
Sawano, Kentarou
Usami, Noritaka
Li, Yiming
Samukawa, Seiji
電機學院
College of Electrical and Computer Engineering
關鍵字: silicon quantum dot (Si QD);quantum dot super lattice (QDSL);miniband;quantum well (QW);photo-carrier transportation;efficiency
公開日期: Jun-2016
摘要: The photovoltaic effect of the silicon (Si)/silicon carbide (SiC) quantum dot super lattice (QDSL) and multi-quantum well (QW) strucutres is presented based on numerical simulation and experimental studies. The QDSL and QW structures act as an intermediate layer in a p-i-n Si solar cell. The QDSL consists of a stack of four 4-nm Si nano disks and 2-nm SiC barrier layers embedded in a SiC matrix fabricated with a top-down etching process. The Si nano disks were observed with bright field-scanning transmission electron microscopy. The simulation results based on the 3D finite element method confirmed that the quantum effect on the band structure for the QDSL and QW structures was different and had different effects on solar cell operation. The effect of vertical wave-function coupling to form a miniband in the QDSL was observed based on the solar-cell performance, showing a dramatic photovoltaic response in generating a high photocurrent density J(sc) of 29.24mA/cm(2), open circuit voltage V-oc of 0.51V, fill factor FF of 0.74, and efficiency eta of 11.07% with respect to a i-QW solar cell with J(sc) of 25.27mA/cm(2), V-oc of 0.49V, FF of 0.69, and eta of 8.61% and an i-Si solar cell with J(sc) of 27.63mA/cm(2), V-oc of 0.55V, FF of 0.61, and eta of 10.00%. A wide range of photo-carrier transports by the QD arrays in the QDSL solar cell is possible in the internal quantum efficiency spectra with respect to the internal quantum efficiency of the i-QW solar cell. Copyright (C) 2015 John Wiley & Sons, Ltd.
URI: http://dx.doi.org/10.1002/pip.2726
http://hdl.handle.net/11536/133619
ISSN: 1062-7995
DOI: 10.1002/pip.2726
期刊: PROGRESS IN PHOTOVOLTAICS
Volume: 24
Issue: 6
起始頁: 774
結束頁: 780
Appears in Collections:Articles