Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/126071
Title: DOPED CONJUGATED POLYELECTROLYTES FOR ORGANIC ELECTRONICS
Authors: CHOO KIM KIAN
Keywords: Dope, Polyelectrolyte, hole-injection, electron-injection, ohmic, high workfunction, low workfunction
Issue Date: 11-Jan-2016
Abstract: Advances in organic electronics have led to the development of organic semiconductor materials with excellent electronic properties. However, the lack of suitable charge injection and extraction contacts limit the performance of these semiconductor devices. This thesis reports the development of solution-processable p- and n-doped organic semiconductors where mobile carriers on polymer backbone are counter-balanced by covalently bonded ions. The polymer is first doped by a strong dopant followed by purification to achieve self-compensated p- and n-doped polymers with an unprecedented workfunction between 3.5 eV to 5.5 eV. Immobilization of counter-ions prevents doping migration which plagues other doped systems with mobile counter-ions. Ohmic injection of both holes and electrons into polyfluorene, a model blue polymer with both deep ionization potential and shallow electron affinity, was successfully demonstrated. With this approach, new classes of doped semiconductors can be realized to achieve ohmic contacts and produce new device design not previously possible.
URI: http://scholarbank.nus.edu.sg/handle/10635/126071
Appears in Collections:Ph.D Theses (Open)

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