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

Sungmin Park; Dongkyun Seo; Kyungwon Kwak; Dae Sung Chung; Cheol Hong Cheon; Bong Soo Kim; Hae Jung Son

doi:10.1016/j.dyepig.2015.08.017

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

Sungmin Park, Dongkyun Seo, Kyungwon Kwak, Dae Sung Chung, Cheol Hong Cheon, Bong Soo Kim, Hae Jung Son

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

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.

Original language	English
Pages (from-to)	323-330
Number of pages	8
Journal	Dyes and Pigments
Volume	123
DOIs	https://doi.org/10.1016/j.dyepig.2015.08.017
Publication status	Published - 2015 Dec 1

Bibliographical note

Funding Information:
This work was supported by the Global Frontier R&D Program on Center for Multiscale Energy System funded by the National Research Foundation under the Ministry of Science, Korea Institute of Science and Technology (KIST) for Project No. 2E25392, and the New and Renewable Energy Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Trade, Industry & Energy (MTIE) ( 20133030000130 , 20113030010030 ). K.K. expresses thanks for financial support from NRF Fund No. 2009-0093817 .

Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.

Keywords

Charge mobility
Conjugated polymer
Effective van der Waals volume
Morphology
Polymer solar cells
Power conversion efficiency

ASJC Scopus subject areas

General Chemical Engineering
Process Chemistry and Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.dyepig.2015.08.017

Cite this

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

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.",

keywords = "Charge mobility, Conjugated polymer, Effective van der Waals volume, Morphology, Polymer solar cells, Power conversion efficiency",

author = "Sungmin Park and Dongkyun Seo and Kyungwon Kwak and Chung, {Dae Sung} and Cheon, {Cheol Hong} and Kim, {Bong Soo} and Son, {Hae Jung}",

note = "Funding Information: This work was supported by the Global Frontier R&D Program on Center for Multiscale Energy System funded by the National Research Foundation under the Ministry of Science, Korea Institute of Science and Technology (KIST) for Project No. 2E25392, and the New and Renewable Energy Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Trade, Industry & Energy (MTIE) ( 20133030000130 , 20113030010030 ). K.K. expresses thanks for financial support from NRF Fund No. 2009-0093817 . Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd. All rights reserved.",

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AU - Park, Sungmin

AU - Seo, Dongkyun

AU - Kwak, Kyungwon

AU - Chung, Dae Sung

AU - Cheon, Cheol Hong

AU - Kim, Bong Soo

AU - Son, Hae Jung

N1 - Funding Information: This work was supported by the Global Frontier R&D Program on Center for Multiscale Energy System funded by the National Research Foundation under the Ministry of Science, Korea Institute of Science and Technology (KIST) for Project No. 2E25392, and the New and Renewable Energy Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Trade, Industry & Energy (MTIE) ( 20133030000130 , 20113030010030 ). K.K. expresses thanks for financial support from NRF Fund No. 2009-0093817 . Publisher Copyright: © 2015 Elsevier Ltd. All rights reserved.

PY - 2015/12/1

Y1 - 2015/12/1

N2 - 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.

AB - 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.

KW - Charge mobility

KW - Conjugated polymer

KW - Effective van der Waals volume

KW - Morphology

KW - Polymer solar cells

KW - Power conversion efficiency

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DO - 10.1016/j.dyepig.2015.08.017

M3 - Article

AN - SCOPUS:84940378462

SN - 0143-7208

VL - 123

SP - 323

EP - 330

JO - Dyes and Pigments

JF - Dyes and Pigments

ER -

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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