GSTDTAP  > 资源环境科学
DOI10.1038/s41467-018-06831-9
Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals
Li, Mingjie1; Bhaumik, Saikat2; Goh, Teck Wee1; Kumar, Muduli Subas2; Yantara, Natalia2; Graetzel, Michael2,3; Mhaisalkar, Subodh2,4; Mathews, Nripan2,4; Sum, Tze Chien1
2017-02-08
发表期刊NATURE COMMUNICATIONS
ISSN2041-1723
出版年2017
卷号8
文章类型Article
语种英语
国家Singapore; Switzerland
英文摘要

Hot-carrier solar cells can overcome the Schottky-Queisser limit by harvesting excess energy from hot carriers. Inorganic semiconductor nanocrystals are considered prime candidates. However, hot-carrier harvesting is compromised by competitive relaxation pathways (for example, intraband Auger process and defects) that overwhelm their phonon bottlenecks. Here we show colloidal halide perovskite nanocrystals transcend these limitations and exhibit around two orders slower hot-carrier cooling times and around four times larger hot-carrier temperatures than their bulk-film counterparts. Under low pump excitation, hot-carrier cooling mediated by a phonon bottleneck is surprisingly slower in smaller nanocrystals (contrasting with conventional nanocrystals). At high pump fluence, Auger heating dominates hot-carrier cooling, which is slower in larger nanocrystals (hitherto unobserved in conventional nanocrystals). Importantly, we demonstrate efficient room temperature hot-electrons extraction (up to similar to 83%) by an energy-selective electron acceptor layer within 1 ps from surface-treated perovskite NCs thin films. These insights enable fresh approaches for extremely thin absorber and concentrator-type hot-carrier solar cells.


领域资源环境
收录类别SCI-E
WOS记录号WOS:000393518000001
WOS关键词QUANTUM-BOX SYSTEMS ; ELECTRON RELAXATION ; SOLAR-CELLS ; HALIDE PEROVSKITES ; DOTS ; PBSE ; RATES
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/204050
专题资源环境科学
作者单位1.Nanyang Technol Univ, Sch Phys & Math Sci, Dept Phys & Appl Phy, 21 Nanyang Link,SPMS PAP 03 05, Singapore 637371, Singapore;
2.NTU ERI N, Energy Res Inst, Res Techno Plaza,X Frontier Block,Level 5, Singapore 637553, Singapore;
3.Swiss Fed Inst Technol, Dept Chem & Chem Engn, Lab Photon & Interfaces, Stn 6, CH-1015 Lausanne, Switzerland;
4.Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore
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Li, Mingjie,Bhaumik, Saikat,Goh, Teck Wee,et al. Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals[J]. NATURE COMMUNICATIONS,2017,8.
APA Li, Mingjie.,Bhaumik, Saikat.,Goh, Teck Wee.,Kumar, Muduli Subas.,Yantara, Natalia.,...&Sum, Tze Chien.(2017).Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals.NATURE COMMUNICATIONS,8.
MLA Li, Mingjie,et al."Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals".NATURE COMMUNICATIONS 8(2017).
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