Theoretical Study on Effect of SiC Crystal Structure on Carrier Transfer in Quantum Dot Solar Cells
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概要
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Quantum dot (QD) solar cells are proposed as high-efficiency solar cells. However, their reported conversion efficiencies have been lower than half of the ideal value. To improve their efficiency, the optimization of their cell structure in terms of various parameters, e.g., dot size, interdot distance, type of materials, and QD/bulk interface structure, is necessary. In this paper, we focused on the most important factor for the improvement in the conversion efficiency of Si/SiC type QD solar cells and investigated the effect of the atomistic structure of the QD/bulk interface on carrier transfer by tight-binding simulation. We constructed models of Si/SiC systems and analyzed the effect of QD/bulk interface defects on their electronic structure and carrier transfer properties. It was suggested that electrons trapped at the QD/bulk interface and the type of SiC crystal structure affect electron transfer.
- 2011-04-25
著者
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Nagumo Ryo
New Industry Creation Hatchery Center, Tohoku University
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Kubo Momoji
Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University
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Suzuki Ai
New Ind. Creation Hatchery Center Tohoku Univ.
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Takaba Hiromitsu
Department Of Applied Chemistry Graduate School Of Engineering Tohoku University
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Tsuboi Hideyuki
Department Of Applied Chemistry Graduate School Of Engineering Tohoku University
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Endou Akira
Department Of Applied Chemistry Graduate School Of Engineering Tohoku University
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Hatakeyama Nozomu
Department Of Applied Chemistry Graduate School Of Engineering Tohoku University
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Yamashita Itaru
Department Of Psychiatry And Neurology Hokkaido University School Of Medicine
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Miura Ryuji
Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-11-1302 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
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Takaba Hiromitsu
Department of Chemical Engineering, Graduated School of Engineering, Tohoku University, Sendai 980-8579, Japan
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Tsuboi Hideyuki
Department of Chemical Engineering, Graduated School of Engineering, Tohoku University, Sendai 980-8579, Japan
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Suzuki Ai
New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8579, Japan
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Miyamoto Akira
New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8579, Japan
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Miyamoto Akira
New Industry Creation Hatchery Center (NICHe), Tohoku University, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
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Hirose Sho
Department of Chemical Engineering, Graduated School of Engineering, Tohoku University, Sendai 980-8579, Japan
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Yamashita Itaru
Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-11-1302 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
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Kubo Momoji
Fracture and Research Institute, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
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