Time-resolved photoconductivity of PbSe nanocrystal arrays.
We report the sub-picosecond photoconductivity dynamics of chemically treated PbSe nanocrystal arrays utilizing time-resolved terahertz spectroscopy (TRTS). TRTS allows both the degree of interdot electronic coupling and the carrier dynamics to be extracted simultaneously. The following capping ligands bonded to the quantum dot surface were studied: hydrazine, ethylenediamine, butlyamine, and aniline. In addition, the arrays were treated with NaOH. We find that the treatments affect both the degree of electronic coupling and the carrier dynamics.
Murphy
James E
JE
Chemical and Biosciences Center, National Renewable Energy Laboratory, Golden, Colorado, 80401, USA.
Beard
Matthew C
MC
Nozik
Arthur J
AJ
D000588:Amines / Q000737:chemistry; D000814:Aniline Compounds / Q000737:chemistry; D003460:Crystallization; D004553:Electric Conductivity; D005029:Ethylenediamines / Q000737:chemistry; D006834:Hydrazines / Q000737:chemistry; D007854:Lead / Q000737:chemistry* / Q000528:radiation effects; D008024:Ligands; D008027:Light; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D010777:Photochemistry; D045663:Quantum Dots; D018036:Selenium Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000528:radiation effects; D012680:Sensitivity and Specificity; D012972:Sodium Hydroxide / Q000737:chemistry; D013057:Spectrum Analysis / Q000379:methods; D013499:Surface Properties; D013997:Time Factors
D000588:Amines; D000814:Aniline Compounds; D005029:Ethylenediamines; D006834:Hydrazines; D008024:Ligands; D018036:Selenium Compounds; C088065:lead selenide; C029424:hydrazine; D007854:Lead; D012972:Sodium Hydroxide; C031234:ethylenediamine; C023650:aniline