Nonequilibrium energy transport in heterogeneous nanoscale semiconductors

Modern optoelectronic devices such as photovoltaics and LEDs operate based on transport of nanoscale energy carriers. Promising material for these devices are assemblies of nanometer-sized semiconductors, including quantum dots (QD) and organic conjugated polymers. Unlike crystalline semiconductors that are homogenous in energy and space, there exist static and dynamical heterogeneity in nanoscale semiconductors. To control energy transport and improve their device efficiencies, this thesis presents nonequilibrium energy transport models to understand the effect of nanoscale heterogeneity on material-wide optoelectronic properties with emphasis on excitons. At first, continuum-level analytical theories and finite element simulations are employed to derive exciton distributions in semiconductor films. These models are applied to transient photoluminescence interfacial quenching experiments of CdSe QD thin film interface to measure exciton diffusion length.

Name thesis:degree_name

Doctoral

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Chemical Engineering

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2018

Author dc:creator

• Lee, Elizabeth Moon Young.

Advisor dc:contributor.advisor

• William A. Tisdale and Adam P. Willard.

• Chemical Engineering.

Statement dc:rights

• MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

https://hdl.handle.net/1721.1/121896

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/121896