Preparation and Characterization of Electrospun Conjugated Polymer Nanofibers with Controlled Diameter and Photovoltaics Thereof

organic photovoltaic;conjugated polymer;electrospinning;nanofiber;exciton dissociation

공과대학 재료공학부 ;

University:서울대학교 대학원

关键词: organic photovoltaic;    conjugated polymer;    electrospinning;    nanofiber;    exciton dissociation;   

Others  :  http://s-space.snu.ac.kr/bitstream/10371/123236/1/000000004450.pdf

美国|英语

来源: Seoul National University Open Repository

【 摘 要 】

thereby increasing the efficiency.However, randomly orientated phases, which appear in the BHJ structured active layer, can result in unconnected islands and therefore reduce the charge transport efficiency. To improve the charge transport efficiency, continuous pathway should be fabricated in an active layer of BHJ OPV. For this purpose, electrospinning is utilized as a facile method for the fabrication of 1-D conjugated polymer nanofibers.For nanofibers with thinner diameter of nanofibers, a proper amount of PEO as an auxiliary polymer, along with DMF and acetic acid as polar solvents were added to the electrospinning dope solution. The addition of an auxiliary polymer increased the viscosity of the electrospinning dope solution and the addition of polar solvent increased the charge density of the electrospinning dope solution. Enhanced viscosity and enhanced charge density resulted in the fabrication of beadless, thin nanofibers.After PEO, which is an insulator, was removed, thin P3HT nanofibers with a diameter of 80 nm was fabricated. In addition, the fabrication of PCDTBT nanofibers with a diameter of approximately 30 nm was accomplished by a similar method.The exciton dissociation of the fabricated P3HT nanofibers was confirmed by photoluminescene quenching, which implies that the fiber can be utilized as an efficient OPV cell material. The power conversion efficiency of electrospun P3HT nanofiber-based OPV cells was c.a. 1 % and would be expected to be increased after the proper optimization processes.