Optically transparent semiconducting polymer nanonetwork for flexible and transparent electronics

Kilho Yu, Byoungwook Park, Geunjin Kim, Chang Hyun Kim, Sungjun Park, Jehan Kim, Suhyun Jung, Soyeong Jeong, Sooncheol Kwon, Hongkyu Kang, Junghwan Kim, Myung Han Yoon, Kwanghee Lee

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

Simultaneously achieving high optical transparency and excellent charge mobility in semiconducting polymers has presented a challenge for the application of these materials in future "flexible" and "transparent" electronics (FTEs). Here, by blending only a small amount (∼15 wt %) of a diketopyrrolopyrrole-based semiconducting polymer (DPP2T) into an inert polystyrene (PS) matrix, we introduce a polymer blend system that demonstrates both high field-effect transistor (FET) mobility and excellent optical transparency that approaches 100%. We discover that in a PS matrix, DPP2T forms a web-like, continuously connected nanonetwork that spreads throughout the thin film and provides highly efficient 2D charge pathways through extended intrachain conjugation. The remarkable physical properties achieved using our approach enable us to develop prototype high-performance FTE devices, including colorless all-polymer FET arrays and fully transparent FET-integrated polymer light-emitting diodes.

Original languageEnglish
Pages (from-to)14261-14266
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume113
Issue number50
DOIs
StatePublished - 13 Dec 2016

Keywords

  • Charge transport
  • Flexible and transparent device
  • Organic electronics
  • Polymer blend
  • Semiconducting polymer

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