Polymer solar cells fabricated with 4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4, 5-b′]dithiophene and alkyl-substituted thiophene-3-carboxylate-containing conjugated polymers: Effect of alkyl side-chain in thiophene-3-carboxylate monomer on the device performance

Min Ju Cho; Jangwon Seo; Kai Luo; Kyung Hwan Kim; Dong Hoon Choi; Paras N. Prasad

doi:10.1016/j.polymer.2012.07.007

Polymer solar cells fabricated with 4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4, 5-b′]dithiophene and alkyl-substituted thiophene-3-carboxylate-containing conjugated polymers: Effect of alkyl side-chain in thiophene-3-carboxylate monomer on the device performance

Min Ju Cho, Jangwon Seo, Kai Luo, Kyung Hwan Kim, Dong Hoon Choi, Paras N. Prasad

Department of Chemistry

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

7 Citations (Scopus)

Abstract

Four alkyl-substituted thiophene-3-carboxylate containing donor-acceptor (D-A) copolymers were designed, synthesized, and characterized. Thiophene-3-carboxylate was used as a weak electron acceptor unit in the copolymers to provide a deeper highest occupied molecular orbital (HOMO) level for obtaining a higher open-circuit voltage in polymer solar cells (PSCs). The resulting bulk heterojunction PSCs, made of the copolymers and [6,6]-phenyl-C71-butyric acid methyl ester (PC₇₁BM), exhibited different short circuit currents (J_SCs) and open-circuit voltages (V_OCs), depending on the length of alkyl side-chain in the thiophene-3-carboxylate unit. Among all fabricated photovoltaic (PV) devices, PC2:PC₇₁BM (1:1 wt. ratio) showed the highest efficiency with the highest J_SC of 10.5 mA/cm². Although PC5:PC₇₁BM (1:1) displayed the highest V_OC of 0.93 V, the device efficiency was observed to be poor, which is due to poor nanophase segregation. This comparison shows that the side-chain of thiophene carboxylate in these copolymers plays a very important role in the device efficiency.

Original language	English
Pages (from-to)	3835-3841
Number of pages	7
Journal	Polymer
Volume	53
Issue number	18
DOIs	https://doi.org/10.1016/j.polymer.2012.07.007
Publication status	Published - 2012 Aug 17

Keywords

Bulk heterojunction
Copolymerization
PCBM

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

UN SDGs

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

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Cho, M. J., Seo, J., Luo, K., Kim, K. H., Choi, D. H., & Prasad, P. N. (2012). Polymer solar cells fabricated with 4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4, 5-b′]dithiophene and alkyl-substituted thiophene-3-carboxylate-containing conjugated polymers: Effect of alkyl side-chain in thiophene-3-carboxylate monomer on the device performance. Polymer, 53(18), 3835-3841. https://doi.org/10.1016/j.polymer.2012.07.007

Polymer solar cells fabricated with 4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4, 5-b′]dithiophene and alkyl-substituted thiophene-3-carboxylate-containing conjugated polymers: Effect of alkyl side-chain in thiophene-3-carboxylate monomer on the device performance. / Cho, Min Ju; Seo, Jangwon; Luo, Kai et al.
In: Polymer, Vol. 53, No. 18, 17.08.2012, p. 3835-3841.

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

Cho, MJ, Seo, J, Luo, K, Kim, KH, Choi, DH & Prasad, PN 2012, 'Polymer solar cells fabricated with 4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4, 5-b′]dithiophene and alkyl-substituted thiophene-3-carboxylate-containing conjugated polymers: Effect of alkyl side-chain in thiophene-3-carboxylate monomer on the device performance', Polymer, vol. 53, no. 18, pp. 3835-3841. https://doi.org/10.1016/j.polymer.2012.07.007

Cho MJ, Seo J, Luo K, Kim KH, Choi DH, Prasad PN. Polymer solar cells fabricated with 4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4, 5-b′]dithiophene and alkyl-substituted thiophene-3-carboxylate-containing conjugated polymers: Effect of alkyl side-chain in thiophene-3-carboxylate monomer on the device performance. Polymer. 2012 Aug 17;53(18):3835-3841. doi: 10.1016/j.polymer.2012.07.007

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title = "Polymer solar cells fabricated with 4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4, 5-b′]dithiophene and alkyl-substituted thiophene-3-carboxylate-containing conjugated polymers: Effect of alkyl side-chain in thiophene-3-carboxylate monomer on the device performance",

abstract = "Four alkyl-substituted thiophene-3-carboxylate containing donor-acceptor (D-A) copolymers were designed, synthesized, and characterized. Thiophene-3-carboxylate was used as a weak electron acceptor unit in the copolymers to provide a deeper highest occupied molecular orbital (HOMO) level for obtaining a higher open-circuit voltage in polymer solar cells (PSCs). The resulting bulk heterojunction PSCs, made of the copolymers and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM), exhibited different short circuit currents (JSCs) and open-circuit voltages (VOCs), depending on the length of alkyl side-chain in the thiophene-3-carboxylate unit. Among all fabricated photovoltaic (PV) devices, PC2:PC71BM (1:1 wt. ratio) showed the highest efficiency with the highest JSC of 10.5 mA/cm2. Although PC5:PC71BM (1:1) displayed the highest VOC of 0.93 V, the device efficiency was observed to be poor, which is due to poor nanophase segregation. This comparison shows that the side-chain of thiophene carboxylate in these copolymers plays a very important role in the device efficiency.",

keywords = "Bulk heterojunction, Copolymerization, PCBM",

author = "Cho, {Min Ju} and Jangwon Seo and Kai Luo and Kim, {Kyung Hwan} and Choi, {Dong Hoon} and Prasad, {Paras N.}",

note = "Funding Information: This work was financially supported by the Air Force Office of Scientific Research (Grant No. FA95500910361 ) and the National Science Foundation (Grant No. DMR0702372 ). Partial support was also provided by the National Research Foundation of Korea Grant funded by the Korean Government ( NRF-2009-352-D00080 ). DH Choi particularly thank for the support by the NRF funded by the Ministry of Education, Science and Technology (NRF2012R1A2A1A01008797 and 20120005860).",

year = "2012",

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doi = "10.1016/j.polymer.2012.07.007",

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TY - JOUR

T1 - Polymer solar cells fabricated with 4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4, 5-b′]dithiophene and alkyl-substituted thiophene-3-carboxylate-containing conjugated polymers

T2 - Effect of alkyl side-chain in thiophene-3-carboxylate monomer on the device performance

AU - Cho, Min Ju

AU - Seo, Jangwon

AU - Luo, Kai

AU - Kim, Kyung Hwan

AU - Choi, Dong Hoon

AU - Prasad, Paras N.

N1 - Funding Information: This work was financially supported by the Air Force Office of Scientific Research (Grant No. FA95500910361 ) and the National Science Foundation (Grant No. DMR0702372 ). Partial support was also provided by the National Research Foundation of Korea Grant funded by the Korean Government ( NRF-2009-352-D00080 ). DH Choi particularly thank for the support by the NRF funded by the Ministry of Education, Science and Technology (NRF2012R1A2A1A01008797 and 20120005860).

PY - 2012/8/17

Y1 - 2012/8/17

N2 - Four alkyl-substituted thiophene-3-carboxylate containing donor-acceptor (D-A) copolymers were designed, synthesized, and characterized. Thiophene-3-carboxylate was used as a weak electron acceptor unit in the copolymers to provide a deeper highest occupied molecular orbital (HOMO) level for obtaining a higher open-circuit voltage in polymer solar cells (PSCs). The resulting bulk heterojunction PSCs, made of the copolymers and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM), exhibited different short circuit currents (JSCs) and open-circuit voltages (VOCs), depending on the length of alkyl side-chain in the thiophene-3-carboxylate unit. Among all fabricated photovoltaic (PV) devices, PC2:PC71BM (1:1 wt. ratio) showed the highest efficiency with the highest JSC of 10.5 mA/cm2. Although PC5:PC71BM (1:1) displayed the highest VOC of 0.93 V, the device efficiency was observed to be poor, which is due to poor nanophase segregation. This comparison shows that the side-chain of thiophene carboxylate in these copolymers plays a very important role in the device efficiency.

AB - Four alkyl-substituted thiophene-3-carboxylate containing donor-acceptor (D-A) copolymers were designed, synthesized, and characterized. Thiophene-3-carboxylate was used as a weak electron acceptor unit in the copolymers to provide a deeper highest occupied molecular orbital (HOMO) level for obtaining a higher open-circuit voltage in polymer solar cells (PSCs). The resulting bulk heterojunction PSCs, made of the copolymers and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM), exhibited different short circuit currents (JSCs) and open-circuit voltages (VOCs), depending on the length of alkyl side-chain in the thiophene-3-carboxylate unit. Among all fabricated photovoltaic (PV) devices, PC2:PC71BM (1:1 wt. ratio) showed the highest efficiency with the highest JSC of 10.5 mA/cm2. Although PC5:PC71BM (1:1) displayed the highest VOC of 0.93 V, the device efficiency was observed to be poor, which is due to poor nanophase segregation. This comparison shows that the side-chain of thiophene carboxylate in these copolymers plays a very important role in the device efficiency.

KW - Bulk heterojunction

KW - Copolymerization

KW - PCBM

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U2 - 10.1016/j.polymer.2012.07.007

DO - 10.1016/j.polymer.2012.07.007

M3 - Article

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SN - 0032-3861

VL - 53

SP - 3835

EP - 3841

JO - Polymer

JF - Polymer

IS - 18

ER -

Polymer solar cells fabricated with 4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4, 5-b′]dithiophene and alkyl-substituted thiophene-3-carboxylate-containing conjugated polymers: Effect of alkyl side-chain in thiophene-3-carboxylate monomer on the device performance

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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