Photoconductivity of PbSe Quantum-Dot Solids: Dependence on Ligand Anchor Group and Length

被引：120

作者：

Gao, Yunan ^{[1
,2
]}

Aerts, Michiel ^{[1
]}

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

Talgorn, Elise ^{[1
]}

Savenije, Tom J. ^{[1
]}

Kinge, Sachin ^{[3
]}

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

Houtepen, Arjan J. ^{[1
]}

机构：

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

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

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

来源：

ACS NANO | 2012年 / 6卷 / 11期

关键词：

quantum dots; solar cells; carrier mobility; carrier lifetime; photoconductivity; layer-by-layer assembly; NANOCRYSTAL SOLAR-CELLS; BAND-LIKE TRANSPORT; COLLOIDAL NANOCRYSTALS; ELECTRICAL-PROPERTIES; PHOTOVOLTAICS; CONDUCTANCE; CONFINEMENT; EFFICIENCY; MOLECULES; CHEMISTRY;

D O I：

10.1021/nn3029716

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The assembly of quantum dots is an essential step toward many of their potential applications. To form conductive solids from colloidal quantum dots, ligand exchange is required. Here we study the influence of ligand replacement on the photoconductivity of PbSe quantum-dot solids, using the time-resolved microwave conductivity technique. Bifunctional replacing ligands with amine, thiol, or carboxylic acid anchor groups of various lengths are used to assemble quantum solids via a layer-by-layer dip-coating method. We find that when the ligand lengths are the same, the charge carrier mobility is higher in quantum-dot solids with amine ligands, while in quantum-dot solids with thiol,ligands the charge carrier lifetime is longer. If the anchor group is the same, the charge carrier mobility Is ligand length dependent The results show that the diffusion length of charge carriers can reach several hundred nanometers.

引用

页码：9606 / 9614

页数：9

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