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Manipulating Electronic Energy Disorder in Colloidal Quantum Dot Solids for Enhanced Charge Carrier Transport
Author(s) -
Lee Sangjin,
Zhitomirsky David,
Grossman Jeffrey C.
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201504816
Subject(s) - materials science , electron mobility , range (aeronautics) , quantum dot , charge (physics) , nanotechnology , doping , dispersity , charge carrier , electron , electron transport chain , chemical physics , optoelectronics , physics , polymer chemistry , quantum mechanics , composite material , botany , biology
A realistic CQD solid model is developed that computes the charge carrier mobility using hopping transport models within an ensemble of individual CQD units. Large decreases in electron mobility of up to 70% as compared to the monodisperse case are observed when the energetic disorder in CQD films lies in the typical experimental range of 10%–15%. Furthermore, it is suggested that tailored and potentially experimentally achievable re‐arrangement of the CQD size ensemble combined with spatial doping control can mediate the reduction in mobility even in highly dispersive cases, and presents an avenue toward improved mobility and photovoltaic performance by up to 9% by leveraging fast carrier transport channels in highly polydisperse materials.