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Recombination Suppression in PbS Quantum Dot Heterojunction Solar Cells by Energy-Level Alignment in the Quantum Dot Active Layers
http://hdl.handle.net/10228/00006895
http://hdl.handle.net/10228/00006895745880ab-3f10-49a7-8dad-3e1cf7e341e5
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ACSami_01-Sep-2017.pdf (1.9 MB)
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| アイテムタイプ | 学術雑誌論文 = Journal Article(1) | |||||
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| 公開日 | 2018-09-03 | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| タイトル | ||||||
| タイトル | Recombination Suppression in PbS Quantum Dot Heterojunction Solar Cells by Energy-Level Alignment in the Quantum Dot Active Layers | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 著者 |
Ding, Chao
× Ding, Chao× Zhang, Yaohong× Liu, Feng× Nakazawa, Naoki× Huang, Qingxun× 早瀬, 修二× 尾込, 裕平× Toyoda, Taro× Wang, Ruixiang× Shen, Qing |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Using spatial energy-level gradient engineering with quantum dots (QDs) of different sizes to increase the generated carrier collection at the junction of a QD heterojunction solar cell (QDHSC) is a hopeful route for improving the energy-conversion efficiency. However, the results of current related research have shown that a variable band-gap structure in a QDHSC will create an appreciable increase, not in the illumination current density, but rather in the fill factor. In addition, there are a lack of studies on the mechanism of the effect of these graded structures on the photovoltaic performance of QDHSCs. This study presents the development of air atmosphere solution-processed TiO2/PbS QDs/Au QDHSCs by engineering the energy-level alignment (ELA) of the active layer via the use of a sorted order of differently sized QD layers (four QD sizes). In comparison to the ungraded device (without the ELA), the optimized graded architecture (containing the ELA) solar cells exhibited a great increase (21.4%) in short-circuit current density (Jsc). As a result, a Jsc value greater than 30 mA/cm2 has been realized in planar, thinner absorption layer (∼300 nm) PbS QDHSCs, and the open-circuit voltage (Voc) and power-conversion efficiency (PCE) were also improved. Through characterization by the light intensity dependences of the Jsc and Voc and transient photovoltage decay, we find that (i) the ELA structure, serving as an electron-blocking layer, reduces the interfacial recombination at the PbS/anode interface, and (ii) the ELA structure can drive more carriers toward the desirable collection electrode, and the additional carriers can fill the trap states, reducing the trap-assisted recombination in the PbS QDHSCs. This work has clearly elucidated the mechanism of the recombination suppression in the graded QDHSCs and demonstrated the effects of ELA structure on the improvement of Jsc. The charge recombination mechanisms characterized in this work would be able to shed light on further improvements of QDHSCs, which could even benefit other types of solar cells. | |||||
| 書誌情報 |
en : ACS Applied Materials & Interfaces 巻 10, 号 31, p. 26142-26152, 発行日 2017-09-01 |
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| 出版社 | ||||||
| 出版者 | American Chemical Society | |||||
| 言語 | en | |||||
| DOI | ||||||
| 関連タイプ | isVersionOf | |||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | https://doi.org/10.1021/acsami.7b06552 | |||||
| ISSN | ||||||
| 収録物識別子タイプ | PISSN | |||||
| 収録物識別子 | 1944-8244 | |||||
| ISSN | ||||||
| 収録物識別子タイプ | EISSN | |||||
| 収録物識別子 | 1944-8252 | |||||
| 著作権関連情報 | ||||||
| 権利情報 | Copyright (c) 2017 American Chemical Society. This material is excerpted from a work that was published in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsami.7b06552. | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | energy-level alignment | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | lead sulfide | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | quantum dot heterojunction solar cells | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | recombination mechanism | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | recombination suppression | |||||
| 出版タイプ | ||||||
| 出版タイプ | AM | |||||
| 出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
| 査読の有無 | ||||||
| 値 | yes | |||||
| 研究者情報 | ||||||
| URL | https://hyokadb02.jimu.kyutech.ac.jp/html/322_ja.html | |||||
| 論文ID（連携） | ||||||
| 値 | 10310146 | |||||
| 連携ID | ||||||
| 値 | 6666 | |||||
