Journal
DYES AND PIGMENTS
Volume 123, Issue -, Pages 323-330Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2015.08.017
Keywords
Conjugated polymer; Polymer solar cells; Power conversion efficiency; Morphology; Charge mobility; Effective van der Waals volume
Funding
- Global Frontier R&D Program on Center for Multiscale Energy System - National Research Foundation under the Ministry of Science, Korea Institute of Science and Technology (KIST) [2E25392]
- New and Renewable Energy Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korea Government Ministry of Trade, Industry Energy (MTIE) [20133030000130, 20113030010030]
- NRF [2009-0093817]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20113030010030] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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/cm(2)) and fill factor (0.674) are the highest of the synthesized polymers. (C) 2015 Elsevier Ltd. All rights reserved.
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