Manipulating Electronic Energy Disorder in Colloidal Quantum Dot Solids for Enhanced Charge Carrier Transport

S Lee and D Zhitomirsky and JC Grossman, ADVANCED FUNCTIONAL MATERIALS, 26, 1554-1562 (2016).

DOI: 10.1002/adfm.201504816

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.

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