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dc.contributor.authorRahman, Mohammad Maksuduren_US
dc.contributor.authorLee, Ming-Yien_US
dc.contributor.authorTsai, Yi-Chiaen_US
dc.contributor.authorHigo, Akioen_US
dc.contributor.authorSekhar, Halubaien_US
dc.contributor.authorIgarashi, Makotoen_US
dc.contributor.authorSyazwan, Mohd Ermanen_US
dc.contributor.authorHoshi, Yusukeen_US
dc.contributor.authorSawano, Kentarouen_US
dc.contributor.authorUsami, Noritakaen_US
dc.contributor.authorLi, Yimingen_US
dc.contributor.authorSamukawa, Seijien_US
dc.description.abstractThe 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.en_US
dc.subjectsilicon quantum dot (Si QD)en_US
dc.subjectquantum dot super lattice (QDSL)en_US
dc.subjectquantum well (QW)en_US
dc.subjectphoto-carrier transportationen_US
dc.titleImpact of silicon quantum dot super lattice and quantum well structure as intermediate layer on p-i-n silicon solar cellsen_US
dc.identifier.journalPROGRESS IN PHOTOVOLTAICSen_US
dc.contributor.departmentCollege of Electrical and Computer Engineeringen_US
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