High-Performance Polymer Solar Cell with Single Active Material of Fully Conjugated Block Copolymer Composed of Wide-Band gap Donor and Narrow-Band gap Acceptor Blocks

Ji Hyung Lee, Chang Geun Park, Aesun Kim, Hyung Jong Kim, Youngseo Kim, Sungnam Park, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We synthesized a novel fully conjugated block copolymer, P3, in which a wide-band gap donor block (P1) was connected to a narrow-band gap acceptor block (P2). As P3 contains P1 block with a wide bandgap and P2 block with a narrow bandgap, it exhibits a very wide complementary absorption. Transient photoluminescence measurement using P3 dilute solution demonstrated intramolecular charge transfer between the P1 block and the P2 block, which was not observed in a P1/P2 blend solution. A P3 thin film showed complete PL quenching because the photoinduced inter-/intramolecular charge transfer states were effectively formed. This phenomenon can play an important role in the photovoltaic properties of P3-based polymer solar cells. A single active material polymer solar cell (SAMPSC) fabricated from P3 alone exhibited a high power conversion efficiency (PCE) of 3.87% with a high open-circuit voltage of 0.93 V and a short-circuit current of 8.26 mA/cm2, demonstrating a much better performance than a binary P1-/P2-based polymer solar cell (PCE = 1.14%). This result facilitates the possible improvement of the photovoltaic performance of SAMPSCs by inducing favorable nanophase segregation between p- and n blocks. In addition, owing to the high morphological stability of the block copolymer, excellent shelf-life was observed in a P3-based SAMPSC compared with a P1/P2-based PSC.

Original languageEnglish
Pages (from-to)18974-18983
Number of pages10
JournalACS Applied Materials and Interfaces
Volume10
Issue number22
DOIs
Publication statusPublished - 2018 Jun 6

Keywords

  • charge transfer
  • conjugated block copolymer
  • polymer solar cells
  • single active material
  • stability

ASJC Scopus subject areas

  • Materials Science(all)

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