Free Charges Produced by Carrier Multiplication in Strongly Coupled PbSe Quantum Dot Films

被引：40

作者：

Aerts, Michiel ^{[1
]}

Sandeep, C. S. Suchand ^{[1
]}

Gao, Yunan ^{[1
,2
]}

Savenije, Tom J. ^{[1
]}

Schins, Juleon M. ^{[1
]}

Houtepen, Arjan J. ^{[1
]}

Kinge, Sachin ^{[3
]}

Siebbeles, Laurens D. A. ^{[1
]}

机构：

[1] Delft Univ Technol, Optoeletron Mat Sect, Dept Chem Engn, NL-2628 BL Delft, Netherlands

[2] Delft Univ Technol, Kavli Inst Nanosci, NL-2628 CJ Delft, Netherlands

[3] Toyota Europe, Mat Res & Dev, B-1930 Zaventem, Belgium

来源：

NANO LETTERS | 2011年 / 11卷 / 10期

关键词：

Carrier multiplication; multiple exciton generation; charge generation; quantum dot solids; solar cells; MULTIPLE EXCITON GENERATION; COLLOIDAL PBSE;

D O I：

10.1021/nl202915p

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We show that in films of strongly coupled PbSe quantum dots multiple electron-hole pairs can be efficiently produced by absorption of a single photon (carrier multiplication). Moreover, in these films carrier multiplication leads to the generation of free, highly mobile charge carriers rather than excitons. Using the time-resolved microwave conductivity technique, we observed the production of more than three electron-hole pairs upon absorption of a single highly energetic photon (5.7E(g)). Free charge carriers produced via carrier multiplication are readily available for use in optoelectronic devices even without employing any complex donor/acceptor architecture or electric fields.

引用

页码：4485 / 4489

页数：5

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