Toward high efficiency organic photovoltaic devices with enhanced thermal stability utilizing P3HT-b-P3PHT block copolymer additives

Mingjing Zhu, Heejun Kim, Yu Jin Jang, Sungmin Park, Du Yeol Ryu, Kyungkon Kim, Ping Tang, Feng Qiu, Dong Ha Kim, Juan Peng

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Organic photovoltaics (OPVs) have drawn an extensive amount of attention due to their low cost, processibility and flexibility. However, a cell based on a blend of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C 61 -butyric acid methyl ester (PC 61 BM) has a limited power conversion efficiency (PCE) due to the short exciton diffusion length of ∼10 nm. We address this issue by designing a series of all-conjugated diblock copolymers, poly(3-hexylthiophene)-b-poly(3-(6-diethylphosphonatohexyl)thiophene) (P3HT-b-P3PHT), intended for use as additives to improve the performance of P3HT:PC 61 BM-based photovoltaic devices. The PCE of the devices improved from 3.30% to 4.03% with the addition of P3HT-b-P3PHT (3:1). The thermal stability of devices with P3HT-b-P3PHT additives improved significantly relative to that of the P3HT:PC 61 BM reference device, where the devices including a copolymer with a higher P3PHT content exhibited a better thermal stability. It was found that the fill factor (FF) could be regulated by simply varying the block ratio of P3HT-b-P3PHT and played a crucial role in improving both the PCE and the thermal stability. The P3HT-b-P3PHT diffused at the P3HT:PC 61 BM interface, improved the miscibility between P3HT and PC 61 BM, optimized the nanoscale morphology of the photoactive layer, and reduced the active layer roughness, all of which improved the FF and thus contributed to an improvement in device performance.

Original languageEnglish
Pages (from-to)18432-18443
Number of pages12
JournalJournal of Materials Chemistry A
Volume4
Issue number47
DOIs
Publication statusPublished - 2016 Jan 1

Fingerprint

Butyric acid
Block copolymers
Esters
Thermodynamic stability
Butyric Acid
Conversion efficiency
Thiophene
Excitons
Copolymers
Solubility
Surface roughness
poly(3-hexylthiophene)
Thiophenes
Costs

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Zhu, Mingjing ; Kim, Heejun ; Jang, Yu Jin ; Park, Sungmin ; Ryu, Du Yeol ; Kim, Kyungkon ; Tang, Ping ; Qiu, Feng ; Kim, Dong Ha ; Peng, Juan. / Toward high efficiency organic photovoltaic devices with enhanced thermal stability utilizing P3HT-b-P3PHT block copolymer additives. In: Journal of Materials Chemistry A. 2016 ; Vol. 4, No. 47. pp. 18432-18443.
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Toward high efficiency organic photovoltaic devices with enhanced thermal stability utilizing P3HT-b-P3PHT block copolymer additives. / Zhu, Mingjing; Kim, Heejun; Jang, Yu Jin; Park, Sungmin; Ryu, Du Yeol; Kim, Kyungkon; Tang, Ping; Qiu, Feng; Kim, Dong Ha; Peng, Juan.

In: Journal of Materials Chemistry A, Vol. 4, No. 47, 01.01.2016, p. 18432-18443.

Research output: Contribution to journalArticle

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AU - Zhu, Mingjing

AU - Kim, Heejun

AU - Jang, Yu Jin

AU - Park, Sungmin

AU - Ryu, Du Yeol

AU - Kim, Kyungkon

AU - Tang, Ping

AU - Qiu, Feng

AU - Kim, Dong Ha

AU - Peng, Juan

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