Diketopyrrolopyrrole-based π-bridged donor-acceptor polymer for photovoltaic applications

Wenting Li, Taegweon Lee, Soong Ju Oh, Cherie R. Kagan

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

We report the synthesis, properties, and photovoltaic applications of a new conjugated copolymer (C12DPP-π-BT) containing a donor group (bithiophene) and an acceptor group (2,5-didodecylpyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione), bridged by a phenyl group. Using cyclic voltammetry, we found the energy levels of C12DPP-π-BT are intermediate to common electron donor and acceptor photovoltaic materials, poly (3-hexylthiophene-2,5-diyl) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), respectively. Whereas P3HT and PCBM are exclusively electron donating or accepting, we predict C12DPP-π-BT may uniquely serve as either an electron donor or an acceptor when paired with PCBM or P3HT forming junctions with large built-in potentials. We confirmed the ambipolar nature of C12DPP-π-BT in space charge limited current measurements and in C12DPP-π-BT:PCBM and C12DPP-π-BT:P3HT bulk heterojunction solar cells, achieving power conversion efficiencies of 1.67% and 0.84%, respectively, under illumination of AM 1.5G (100 mW/cm 2 ). Adding diiodooctane to C12DPP-π-BT:PCBM improved donor-acceptor inter-mixing and film uniformity, and therefore enhanced charge separation and overall device efficiency. Using higher-molecular-weight polymer C12DPP-π-BT in both C12DPP-π-BT:PCBM and C12DPP-π-BT:P3HT devices improved charge transport and hence the performance of the solar cells. In addition, we compared the structural and electronic properties of C12DPP-π-BT:PCBM and C12DPP-π-BT:P3HT blends, representing the materials classes of polymer:fullerene and polymer:polymer blends. In C12DPP-π-BT:PCBM blends, higher short circuit currents were obtained, consistent with faster charge transfer and balanced electron and hole transport, but lower open circuit voltages may be reduced by trap-assisted recombination and interfacial recombination losses. In contrast, C12DPP-π-BT:P3HT blends exhibit higher open circuit voltage, but short circuit currents were limited by charge transfer between the polymers. In conclusion, C12DPP-π-BT is a promising material with intrinsic ambipolar characteristics for organic photovoltaics and may operate as either a donor or acceptor in the design of bulk heterojunction solar cells.

Original languageEnglish
Pages (from-to)3874-3883
Number of pages10
JournalACS Applied Materials and Interfaces
Volume3
Issue number10
DOIs
Publication statusPublished - 2011 Oct 26
Externally publishedYes

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Butyric acid
Butyric Acid
Esters
Polymers
Charge transfer
Solar cells
Electrons
Open circuit voltage
Short circuit currents
Heterojunctions
Fullerenes
Textile blends
Pyrroles
Electric current measurement
Polymer blends
Electric space charge
Electronic properties
Electron energy levels
Conversion efficiency
Cyclic voltammetry

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Diketopyrrolopyrrole-based π-bridged donor-acceptor polymer for photovoltaic applications. / Li, Wenting; Lee, Taegweon; Oh, Soong Ju; Kagan, Cherie R.

In: ACS Applied Materials and Interfaces, Vol. 3, No. 10, 26.10.2011, p. 3874-3883.

Research output: Contribution to journalArticle

Li, Wenting ; Lee, Taegweon ; Oh, Soong Ju ; Kagan, Cherie R. / Diketopyrrolopyrrole-based π-bridged donor-acceptor polymer for photovoltaic applications. In: ACS Applied Materials and Interfaces. 2011 ; Vol. 3, No. 10. pp. 3874-3883.
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