DEVELOPMENT OF HYBRID NANOCRYSTAL/CONDUCTING POLYMER OPTOELECTRONIC DEVICES
Open Access
Author:
Zhu, Ting
Graduate Program:
Engineering Science and Mechanics
Degree:
Doctor of Philosophy
Document Type:
Dissertation
Date of Defense:
July 02, 2009
Committee Members:
Jian Xu, Dissertation Advisor/Co-Advisor Jian Xu, Committee Chair/Co-Chair Jerzy Ruzyllo, Committee Member S Ashok, Committee Member Michael T Lanagan, Committee Member
Novel hybrid inorganic nanocrystal/conducting polymer optoelectronic devices have gained extensive interest due to the benefits of ease of processing, low cost, substrate flexibility, large area coverage and size-tunable absorption/emissions.
This thesis reports the development of photovoltaic devices and light emitting diodes (LED) based on semiconductor nanocrystal quantum dots (NQD). First, a PbSe NQD/P3HT thin film photovoltaic was developed with the capability of utilizing infrared energy. The device performance is further improved by employing new device architecture. Second a PbSe NQD-based LED with strong infrared emission was developed, an energy transfer between NQD and polymer was proved to be the dominant mechanism for infrared emission. A surface engineering of PbSe NQD enables better carrier injection and results in a most efficient infrared QD-LED reported so far. Finally patterning techniques for QD-LED display was developed by means of mist deposition technique. The advances in blue quantum dots synthesis also led to the fabrication of a bright and color-saturated blue QD-LED.
