Enhanced air stability of polymer solar cells with a nanofibril-based photoactive layer

Jin Young Oh, Minkwan Shin, Hyun Woo Lee, Yu Jeong Lee, Hong Koo Baik, Unyong Jeong

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In spite of the rapid increase in the power conversion efficiency (PCE) of polymer solar cells (PSCs), the poor stability of the photoactive layer in air under sunlight is a critical problem blocking commercialization of PSCs. This study investigates the photo-oxidation behavior of a bulk-heterojunction (BHJ) photoactive film made of single-crystalline poly(3-hexlythiophene) (P3HT) nanofibrils and fullerene derivatives [phenyl-C61-butyric methyl ester (PCBM), indene-C 60 bisadduct (ICBA)]. Because the single-crystalline P3HT nanofibrils had tightly packed π-π stacking, the permeation of oxygen and water into the nanofibrils was significantly reduced. Chemical changes in P3HT were not apparent in the nanofibrils, and hence the air stability of the nanofibril-based BHJ film was considerably enhanced as compared with conventional BHJ films. The chemical changes were monitored by Fourier-transform infrared (FT-IR) spectroscopy, Raman spectroscopy, and UV-vis absorbance. Inverted PSCs made of the nanofibril-based BHJ layer also showed significantly enhanced air stability under sunlight. The nanofibril-based solar cell maintained more than 80% of its initial PCE after 30 days of continuous exposure to sunlight (AM 1.5G, 100 mW/cm2), whereas the PCE of the conventional BHJ solar cell decreased to 20% of its initial PCE under the same experimental conditions.

Original languageEnglish
Pages (from-to)7759-7765
Number of pages7
JournalACS Applied Materials and Interfaces
Volume6
Issue number10
DOIs
Publication statusPublished - 2014 May 28

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Heterojunctions
Conversion efficiency
Air
Solar cells
Crystalline materials
Fullerenes
Photooxidation
Permeation
Fourier transform infrared spectroscopy
Raman spectroscopy
Esters
Polymer solar cells
Oxygen
Derivatives
Water

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Oh, Jin Young ; Shin, Minkwan ; Lee, Hyun Woo ; Lee, Yu Jeong ; Baik, Hong Koo ; Jeong, Unyong. / Enhanced air stability of polymer solar cells with a nanofibril-based photoactive layer. In: ACS Applied Materials and Interfaces. 2014 ; Vol. 6, No. 10. pp. 7759-7765.
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Enhanced air stability of polymer solar cells with a nanofibril-based photoactive layer. / Oh, Jin Young; Shin, Minkwan; Lee, Hyun Woo; Lee, Yu Jeong; Baik, Hong Koo; Jeong, Unyong.

In: ACS Applied Materials and Interfaces, Vol. 6, No. 10, 28.05.2014, p. 7759-7765.

Research output: Contribution to journalArticle

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T1 - Enhanced air stability of polymer solar cells with a nanofibril-based photoactive layer

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AU - Shin, Minkwan

AU - Lee, Hyun Woo

AU - Lee, Yu Jeong

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AU - Jeong, Unyong

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N2 - In spite of the rapid increase in the power conversion efficiency (PCE) of polymer solar cells (PSCs), the poor stability of the photoactive layer in air under sunlight is a critical problem blocking commercialization of PSCs. This study investigates the photo-oxidation behavior of a bulk-heterojunction (BHJ) photoactive film made of single-crystalline poly(3-hexlythiophene) (P3HT) nanofibrils and fullerene derivatives [phenyl-C61-butyric methyl ester (PCBM), indene-C 60 bisadduct (ICBA)]. Because the single-crystalline P3HT nanofibrils had tightly packed π-π stacking, the permeation of oxygen and water into the nanofibrils was significantly reduced. Chemical changes in P3HT were not apparent in the nanofibrils, and hence the air stability of the nanofibril-based BHJ film was considerably enhanced as compared with conventional BHJ films. The chemical changes were monitored by Fourier-transform infrared (FT-IR) spectroscopy, Raman spectroscopy, and UV-vis absorbance. Inverted PSCs made of the nanofibril-based BHJ layer also showed significantly enhanced air stability under sunlight. The nanofibril-based solar cell maintained more than 80% of its initial PCE after 30 days of continuous exposure to sunlight (AM 1.5G, 100 mW/cm2), whereas the PCE of the conventional BHJ solar cell decreased to 20% of its initial PCE under the same experimental conditions.

AB - In spite of the rapid increase in the power conversion efficiency (PCE) of polymer solar cells (PSCs), the poor stability of the photoactive layer in air under sunlight is a critical problem blocking commercialization of PSCs. This study investigates the photo-oxidation behavior of a bulk-heterojunction (BHJ) photoactive film made of single-crystalline poly(3-hexlythiophene) (P3HT) nanofibrils and fullerene derivatives [phenyl-C61-butyric methyl ester (PCBM), indene-C 60 bisadduct (ICBA)]. Because the single-crystalline P3HT nanofibrils had tightly packed π-π stacking, the permeation of oxygen and water into the nanofibrils was significantly reduced. Chemical changes in P3HT were not apparent in the nanofibrils, and hence the air stability of the nanofibril-based BHJ film was considerably enhanced as compared with conventional BHJ films. The chemical changes were monitored by Fourier-transform infrared (FT-IR) spectroscopy, Raman spectroscopy, and UV-vis absorbance. Inverted PSCs made of the nanofibril-based BHJ layer also showed significantly enhanced air stability under sunlight. The nanofibril-based solar cell maintained more than 80% of its initial PCE after 30 days of continuous exposure to sunlight (AM 1.5G, 100 mW/cm2), whereas the PCE of the conventional BHJ solar cell decreased to 20% of its initial PCE under the same experimental conditions.

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