TY - JOUR
T1 - Photoconductivity of PbSe quantum-dot solids
T2 - Dependence on ligand anchor group and length
AU - Gao, Yunan
AU - Aerts, Michiel
AU - Sandeep, C. S.Suchand
AU - Talgorn, Elise
AU - Savenije, Tom J.
AU - Kinge, Sachin
AU - Siebbeles, Laurens D.A.
AU - Houtepen, Arjan J.
PY - 2012/11/27
Y1 - 2012/11/27
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/84870448986
UR - https://www.scopus.com/pages/publications/84870448986#tab=citedBy
U2 - 10.1021/nn3029716
DO - 10.1021/nn3029716
M3 - Article
C2 - 23078408
AN - SCOPUS:84870448986
SN - 1936-0851
VL - 6
SP - 9606
EP - 9614
JO - ACS Nano
JF - ACS Nano
IS - 11
ER -