title: Time-resolved photoconductivity of PbSe nanocrystal arrays.
abstract: 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.
authors.affiliation: Chemical and Biosciences Center, National Renewable Energy Laboratory, Golden, Colorado, 80401, USA.
authors.forename: James E
authors.initials: JE
authors.lastname: Murphy
authors.forename: Matthew C
authors.initials: MC
authors.lastname: Beard
authors.forename: Arthur J
authors.initials: AJ
authors.lastname: Nozik
mesh_terms: 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
chemical_list: 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