Highly Stable Polymer Solar Cells Based on Poly(dithienobenzodithiophene- co -thienothiophene)

Nara Shin, Hui Jun Yun, Youngwoon Yoon, Hae Jung Son, Sang Yong Ju, Soon Ki Kwon, Bongsoo Kim, Yun Hi Kim

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

It is important to develop new donor (D)-acceptor (A) type low band gap polymers for highly stable polymer solar cells (PSCs). Here, we describe the synthesis and photovoltaic properties of two D-A type low band gap polymers. The polymers consist of dithienobenzodithiophene (DTBDT) moieties with expanded conjugation side groups as donors and 2-ethyl-1-(thieno[3,4-b]thiophen-2-yl)hexan-1-one (TTEH) or 6-octyl-5H-thieno[3′,4′:4,5]thieno[2,3-c]pyrrole-5,7(6H)-dione (DTPD) as acceptors to give pDTBDT-TTEH and pDTBDT-DTPD polymers, respectively. The pDTBDT-TTEH is quite flat, resulting in a highly crystalline film. In contrast, the pDTBDT-DTPD is highly twisted to yield an amorphous film. Photovoltaic devices based on pDTBDT-TTEH and pDTBDT-DTPD exhibited power conversion efficiencies (PCEs) of 6.74% and 4.44%, respectively. The PCE difference results mainly from morphological differences between the two polymer:PC71BM blend films; the pDTBDT-TTEH polymer formed a nanoscopically networked domains in the blend state, while the pDTBDT-DTPD polymer film contained aggregated domains with large phase separation between the polymer and PC71BM molecules. Importantly, we observed that pDTBDT-TTEH-based devices showed excellent stability-in air, retaining 95% of the initial PCE after storage for over 1000 h without encapsulation. The high stability of the pDTBDT-TTEH-based device was originated mainly by the crystalline nature of the pDTBDT-TTEH:PC71BM film. This work suggests that designing highly conjugated planar backboned polymers is crucial to improve not only the photovoltaic performance but also the stability of PSCs.

Original languageEnglish
Pages (from-to)3890-3899
Number of pages10
JournalMacromolecules
Volume48
Issue number12
DOIs
Publication statusPublished - 2015 Jun 23

Fingerprint

Polymers
Conversion efficiency
Polymer blends
Energy gap
Crystalline materials
Pyrroles
Amorphous films
Polymer solar cells
Encapsulation
Polymer films
Phase separation
Molecules
Air

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Shin, Nara ; Yun, Hui Jun ; Yoon, Youngwoon ; Son, Hae Jung ; Ju, Sang Yong ; Kwon, Soon Ki ; Kim, Bongsoo ; Kim, Yun Hi. / Highly Stable Polymer Solar Cells Based on Poly(dithienobenzodithiophene- co -thienothiophene). In: Macromolecules. 2015 ; Vol. 48, No. 12. pp. 3890-3899.
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title = "Highly Stable Polymer Solar Cells Based on Poly(dithienobenzodithiophene- co -thienothiophene)",
abstract = "It is important to develop new donor (D)-acceptor (A) type low band gap polymers for highly stable polymer solar cells (PSCs). Here, we describe the synthesis and photovoltaic properties of two D-A type low band gap polymers. The polymers consist of dithienobenzodithiophene (DTBDT) moieties with expanded conjugation side groups as donors and 2-ethyl-1-(thieno[3,4-b]thiophen-2-yl)hexan-1-one (TTEH) or 6-octyl-5H-thieno[3′,4′:4,5]thieno[2,3-c]pyrrole-5,7(6H)-dione (DTPD) as acceptors to give pDTBDT-TTEH and pDTBDT-DTPD polymers, respectively. The pDTBDT-TTEH is quite flat, resulting in a highly crystalline film. In contrast, the pDTBDT-DTPD is highly twisted to yield an amorphous film. Photovoltaic devices based on pDTBDT-TTEH and pDTBDT-DTPD exhibited power conversion efficiencies (PCEs) of 6.74{\%} and 4.44{\%}, respectively. The PCE difference results mainly from morphological differences between the two polymer:PC71BM blend films; the pDTBDT-TTEH polymer formed a nanoscopically networked domains in the blend state, while the pDTBDT-DTPD polymer film contained aggregated domains with large phase separation between the polymer and PC71BM molecules. Importantly, we observed that pDTBDT-TTEH-based devices showed excellent stability-in air, retaining 95{\%} of the initial PCE after storage for over 1000 h without encapsulation. The high stability of the pDTBDT-TTEH-based device was originated mainly by the crystalline nature of the pDTBDT-TTEH:PC71BM film. This work suggests that designing highly conjugated planar backboned polymers is crucial to improve not only the photovoltaic performance but also the stability of PSCs.",
author = "Nara Shin and Yun, {Hui Jun} and Youngwoon Yoon and Son, {Hae Jung} and Ju, {Sang Yong} and Kwon, {Soon Ki} and Bongsoo Kim and Kim, {Yun Hi}",
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Shin, N, Yun, HJ, Yoon, Y, Son, HJ, Ju, SY, Kwon, SK, Kim, B & Kim, YH 2015, 'Highly Stable Polymer Solar Cells Based on Poly(dithienobenzodithiophene- co -thienothiophene)', Macromolecules, vol. 48, no. 12, pp. 3890-3899. https://doi.org/10.1021/acs.macromol.5b00514

Highly Stable Polymer Solar Cells Based on Poly(dithienobenzodithiophene- co -thienothiophene). / Shin, Nara; Yun, Hui Jun; Yoon, Youngwoon; Son, Hae Jung; Ju, Sang Yong; Kwon, Soon Ki; Kim, Bongsoo; Kim, Yun Hi.

In: Macromolecules, Vol. 48, No. 12, 23.06.2015, p. 3890-3899.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Highly Stable Polymer Solar Cells Based on Poly(dithienobenzodithiophene- co -thienothiophene)

AU - Shin, Nara

AU - Yun, Hui Jun

AU - Yoon, Youngwoon

AU - Son, Hae Jung

AU - Ju, Sang Yong

AU - Kwon, Soon Ki

AU - Kim, Bongsoo

AU - Kim, Yun Hi

PY - 2015/6/23

Y1 - 2015/6/23

N2 - It is important to develop new donor (D)-acceptor (A) type low band gap polymers for highly stable polymer solar cells (PSCs). Here, we describe the synthesis and photovoltaic properties of two D-A type low band gap polymers. The polymers consist of dithienobenzodithiophene (DTBDT) moieties with expanded conjugation side groups as donors and 2-ethyl-1-(thieno[3,4-b]thiophen-2-yl)hexan-1-one (TTEH) or 6-octyl-5H-thieno[3′,4′:4,5]thieno[2,3-c]pyrrole-5,7(6H)-dione (DTPD) as acceptors to give pDTBDT-TTEH and pDTBDT-DTPD polymers, respectively. The pDTBDT-TTEH is quite flat, resulting in a highly crystalline film. In contrast, the pDTBDT-DTPD is highly twisted to yield an amorphous film. Photovoltaic devices based on pDTBDT-TTEH and pDTBDT-DTPD exhibited power conversion efficiencies (PCEs) of 6.74% and 4.44%, respectively. The PCE difference results mainly from morphological differences between the two polymer:PC71BM blend films; the pDTBDT-TTEH polymer formed a nanoscopically networked domains in the blend state, while the pDTBDT-DTPD polymer film contained aggregated domains with large phase separation between the polymer and PC71BM molecules. Importantly, we observed that pDTBDT-TTEH-based devices showed excellent stability-in air, retaining 95% of the initial PCE after storage for over 1000 h without encapsulation. The high stability of the pDTBDT-TTEH-based device was originated mainly by the crystalline nature of the pDTBDT-TTEH:PC71BM film. This work suggests that designing highly conjugated planar backboned polymers is crucial to improve not only the photovoltaic performance but also the stability of PSCs.

AB - It is important to develop new donor (D)-acceptor (A) type low band gap polymers for highly stable polymer solar cells (PSCs). Here, we describe the synthesis and photovoltaic properties of two D-A type low band gap polymers. The polymers consist of dithienobenzodithiophene (DTBDT) moieties with expanded conjugation side groups as donors and 2-ethyl-1-(thieno[3,4-b]thiophen-2-yl)hexan-1-one (TTEH) or 6-octyl-5H-thieno[3′,4′:4,5]thieno[2,3-c]pyrrole-5,7(6H)-dione (DTPD) as acceptors to give pDTBDT-TTEH and pDTBDT-DTPD polymers, respectively. The pDTBDT-TTEH is quite flat, resulting in a highly crystalline film. In contrast, the pDTBDT-DTPD is highly twisted to yield an amorphous film. Photovoltaic devices based on pDTBDT-TTEH and pDTBDT-DTPD exhibited power conversion efficiencies (PCEs) of 6.74% and 4.44%, respectively. The PCE difference results mainly from morphological differences between the two polymer:PC71BM blend films; the pDTBDT-TTEH polymer formed a nanoscopically networked domains in the blend state, while the pDTBDT-DTPD polymer film contained aggregated domains with large phase separation between the polymer and PC71BM molecules. Importantly, we observed that pDTBDT-TTEH-based devices showed excellent stability-in air, retaining 95% of the initial PCE after storage for over 1000 h without encapsulation. The high stability of the pDTBDT-TTEH-based device was originated mainly by the crystalline nature of the pDTBDT-TTEH:PC71BM film. This work suggests that designing highly conjugated planar backboned polymers is crucial to improve not only the photovoltaic performance but also the stability of PSCs.

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