Nano-interface engineering of heterojunction quantum dot solar cells and the effect on charge separation of multiple excitons
Project/Area Number |
17H02736
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Nanomaterials chemistry
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Research Institution | The University of Electro-Communications |
Principal Investigator |
Shen Qing 電気通信大学, 大学院情報理工学研究科, 教授 (50282926)
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Co-Investigator(Kenkyū-buntansha) |
豊田 太郎 電気通信大学, その他部局等, 名誉教授 (40217576)
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Project Period (FY) |
2017-04-01 – 2020-03-31
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Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000)
Fiscal Year 2019: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2017: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
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Keywords | 量子ドット / 多重励起子 / 太陽電池 / 電荷分離 / ナノ界面 / パッシベーション / ヘテロ接合 / 電荷再結合 / 光励起キャリアダイナミクス / 界面修飾 / 界面制御 |
Outline of Final Research Achievements |
We have investigated the photoexcited carrier dynamics in QD films with sufficiently controlled different QD-QD distances, and found that the rate constant of charge separation of multiple excitons strongly depends on the QD distance. It was found that by controlling the QD distance shorter than a certain value, multiple excitons can be separated through charge transfer from one QD to the neighboring one because the charge transfer rate is larger than the Auger recombination rate. From our findings, it is suggested that the multiple excitons generation (MEG), which is a key feature of the QDs, can be used for optoelectronic devices such as solar cells. In addition, by passivating the three kinds of interfaces, i.e., the electron transport layer/QD film interface, the QD-QD interface and the QD film/hole transport layer interface in the QD heterojunction solar cells, we have achieved the world's top level of energy conversion efficiency of 12.5% for PbS QD heterojunction solar cells.
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Academic Significance and Societal Importance of the Research Achievements |
半導体量子ドット(QD)を利用した太陽電池(量子ドット太陽電池)は、集光時の理論効率は60%以上ともいわれ、高効率次世代太陽電池として注目されている。量子ドット太陽電池の特徴は、これまで活用できなかった幅広い波長の光吸収を行えること、高いエネルギーの光を熱エネルギーとして損失する前に励起子生成に活用できることである。どちらも従来の太陽電池のボトルネックを解決するものであるが、高いエネルギーの光を活用するには、通常1光子に1つしか取り出せない励起子を複数取り出すことができる多重励起子生成(MEG)の発現が鍵となる。本研究の成果は高効率MEG型太陽電池の設計に有意義な基礎データとなる。
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Report
(4 results)
Research Products
(62 results)
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[Journal Article] CsPb(IxBr1-x)3 solar cells2019
Author(s)
Jia Xue、Zuo Chuantian、Tao Shuxia、Sun Kuan、Zhao Yixin、Yang Shangfeng、Cheng Ming、Wang Mingkui、Yuan Yongbo、Yang Junliang、Gao Feng、Xing Guichuan、Wei Zhanhua、Shen Qing、Yin Longwei、Han Liyuan、Liu Shengzhong、Wang Lianzhou、Ding Liming
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Journal Title
Science Bulletin
Volume: 64
Issue: 20
Pages: 1532-1539
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Ultrafast electron injection from photoexcited perovskite CsPbI3 QDs into TiO2 nanoparticles with injection efficiency near 99%2018
Author(s)
Feng Liu, Yaohong Zhang, Chao Ding, Taro Toyoda, Yuhei Ogomi, Teresa S. Ripolles, Shuzi Hayase, Takashi Minemoto, Kenji Yoshino, Songyuan Dai, Qing Shen*.
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Journal Title
The Journal of Physical Chemistry Letter
Volume: 9
Issue: 2
Pages: 294-297
DOI
NAID
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Colloidal synthesis of air-stable alloyed CsSn1-xPbxI3 perovskite nanocrystals for use in solar Cells2017
Author(s)
Feng Liu, Chao Ding, Yaohong Zhang, Teresa S. Ripolles, Taichi Kamisaka, Taro Toyoda, Shuzi Hayase, Takashi Minemoto, Kenji Yoshino, Songyuan Dai, Masatoshi Yanagida, Hidenori Noguchi, Qing Shen
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Journal Title
J. Am. Chem. Soc.
Volume: 139
Issue: 46
Pages: 16708-16719
DOI
NAID
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Highly Luminescent Phase-Stable CsPbI3 Perovskite Quantum Dots Achieving Near 100% Absolute Photoluminescence Quantum Yield2017
Author(s)
Feng Liu, Yaohong Zhang, Chao Ding, Syuusuke Kobayashi, Takuya Izuishi, Naoki Nakazawa, Taro Toyoda, Tsuyoshi Ohta, Shuzi Hayase, Takashi Minemoto, Kenji Yoshino, Songyuan Dai, and Qing Shen*
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Journal Title
ACS Nano
Volume: 11
Issue: 10
Pages: 10373-10383
DOI
NAID
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Improvement of photovoltaic performance of colloidal quantum dot solar cells using organic small molecule as hole-selective layer2017
Author(s)
Zhang Yaohong, Wu Guohua, Mora-Sero Ivan, Ding Chao, Liu Feng, Huang Qingxun, Ogomi Yuhei, Hayase Shuzi, Toyoda Taro, Wang Ruixiang, Otsuki Joe, and Shen Qing*
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Journal Title
The Journal of Physical Chemistry Letter
Volume: 8
Issue: 10
Pages: 2163-2169
DOI
NAID
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Alloying Strategy in CuInGaSe Quantum Dots for High Efficiency Quantum Dot Sensitized Solar Cells2017
Author(s)
Wenxiang Peng, Jun Du, Zhenxiao Pan, Naoki Nakazawa, Jiankun Sun, Zhonglin Du, Gencai Shen, Juan Yu, Jin-Song Hu*, Qing Shen*, and Xinhua Zhong*
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Journal Title
ACS Appl. Mater. Interfaces
Volume: 9
Issue: 6
Pages: 5328-5336
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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