Effects of dynamic 3D-volume of side chains in conjugated polymers on nano-scale morphology and solar cell properties

Title
Effects of dynamic 3D-volume of side chains in conjugated polymers on nano-scale morphology and solar cell properties
Authors
박성민서동균곽경원정대성천철홍김봉수손해정
Keywords
polymer solar cell; conjugated polymer; power conversion efficiency; morphology
Issue Date
2015-12
Publisher
Dyes and pigments
Citation
VOL 123, 323-330
Abstract
We have synthesized a series of benzo[1,2-b:4,5-b′]-dithiophene (BDT)-co-thieno[3,4-b]thiophene (TT) based polymers with various alkyl side chains and bridging-atom on their TT units and studied the effects of the variation in the effective van der Waals volumes (eVol) of the side chains on the photovoltaic properties of the associated bulk heterojunction (BHJ) solar cells. eVol was found to be correlated with the degree of phase separation in the BHJ film, which affects the area of the polymer-PC71BM interface and the charge mobility. The polymer has a 2-ethylhexyl group that results in a relatively optimal BHJ film morphology, with sufficient polymer-PC71BM interfacial area for efficient charge generation and minimal charge mobility loss upon BHJ film formation. As a result, the solar cell device (2-ethylhexyl polymer) exhibits the highest power conversion efficiency of 8.25% because its short-circuit current density value (16.24 mA/cm2) and fill factor (0.674) are the highest of the synthesized polymers.
URI
http://pubs.kist.re.kr/handle/201004/50261
ISSN
01437208
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KIST Publication > Article
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