title: High aspect ratio conjugated polymer nanowires for high performance field-effect transistors and phototransistors.
abstract: We synthesized a highly crystalline DPP-based polymer, DPPBTSPE, which contained 1,2-bis(5-(thiophen-2-yl)selenophen-2-yl)ethene as a planar and rigid electron donating group. High- and low-molecular weight (MW) DPPBTSPE fractions were collected by Soxhlet extraction and were employed to investigate their unique charge transport properties in macroscopic films and single crystalline polymer nanowire (SC-PNW), respectively. The low-MW polymer could provide well-isolated and high aspect ratio SC-PNWs, in which the direction of π-π stacking was perpendicular to the wire growing axis. The field effect transistors made of SC-PNWs exhibited remarkably high carrier mobility of 24 cm(2) V(-1) s(-1). In addition, phototransistors (PTs) made of SC-PNW showed very high performance in terms of photoresponsivity (R) and photoswitching ratio (P). The average R of the SC PNW-based PTs were in the range of 160-170 A W(-1) and the maximum R was measured at 1920 A W(-1), which is almost three orders higher than that of thin film-based PT device.
authors.affiliation: †Department of Chemistry, Research Institute for Natural Sciences, Korea University 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Hyun Ah
authors.initials: HA
authors.lastname: Um
authors.affiliation: †Department of Chemistry, Research Institute for Natural Sciences, Korea University 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Dae Hee
authors.initials: DH
authors.lastname: Lee
authors.affiliation: †Department of Chemistry, Research Institute for Natural Sciences, Korea University 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Dong Uk
authors.initials: DU
authors.lastname: Heo
authors.affiliation: †Department of Chemistry, Research Institute for Natural Sciences, Korea University 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Da Seul
authors.initials: DS
authors.lastname: Yang
authors.affiliation: †Department of Chemistry, Research Institute for Natural Sciences, Korea University 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Jicheol
authors.initials: J
authors.lastname: Shin
authors.affiliation: ‡Division of Analytical Research, Korea Basic Science Institute, 74 Inchon-ro, Sungbuk-gu, Seoul 136-713, Republic of Korea.
authors.forename: Hionsuck
authors.initials: H
authors.lastname: Baik
authors.affiliation: †Department of Chemistry, Research Institute for Natural Sciences, Korea University 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Min Ju
authors.initials: MJ
authors.lastname: Cho
authors.affiliation: †Department of Chemistry, Research Institute for Natural Sciences, Korea University 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Dong Hoon
authors.initials: DH
authors.lastname: Choi
keywords: diketopyrrolopyrrole; field-effect transistor; phototransistor; polymer nanowire; selenophene