Please use this identifier to cite or link to this item:
Title: Electronic Structure of Organic Semiconductor Multi-Heterojunctions
Keywords: Organic semiconductor, energy level alignment, heterojunction
Issue Date: 11-Sep-2009
Citation: YONG CHAW KEONG (2009-09-11). Electronic Structure of Organic Semiconductor Multi-Heterojunctions. ScholarBank@NUS Repository.
Abstract: Abstract: Electronic Structure of Organic Semiconductor Multi-Heterojunctions Chaw Keong Yong, Department of Physics, submitted for the degree of Master of Science, 2009 This thesis investigated the electronic structure of organic semiconductor multi-heterojunctions which is critical for the control of charge injection, separation, and exciton recombination at the interface in various organic devices. Organic semiconductors based on sexithiophene (6T), fullerene (C60), tetrafluoro-tetracyanoquinodimethane (F4¬¿TCNQ), poly(9,9¿-dioctylfluorene) (F8), and poly(3-hexylthiophene) (P3HT) have been used to form the multi-heterojunctions in different combinations on poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDT:PSSM) conducting polymer surfaces in UHV chamber and characterized in-situ by Photoemission Spectroscopy. With 6T and C60 as model system, the molecular orientation dependent charge transfer at the interface of organic donor-acceptor heterojunction was observed.m the time-dependent photoemission spectroscopy measurements that the interface dipole potential in a blend of donor-acceptor was widely distributed which resulted in broadening of the polaron energies. The phase segregation in donor-acceptor blended heterojunction also resulted in local built-in electric field. This suggests the Coulomb energy of polaron-pairs at the donor-acceptor interface could be inhomogeneous throughout the device blended heterojunctions.
Appears in Collections:Master's Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
Chaw_Keong Thesis.pdf1.9 MBAdobe PDF



Page view(s)

checked on Apr 18, 2019


checked on Apr 18, 2019

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.