title: Observation of Charge Separation and Space-Charge Region in Single-Crystal P3HT/C60 Heterojunction Nanowires.
abstract: We directly observed charge separation and a space-charge region in an organic single-crystal p-n heterojunction nanowire, by means of scanning photocurrent microscopy. The axial p-n heterojunction nanowire had a well-defined planar junction, consisted of P3HT (p-type) and C60 (n-type) single crystals and was fabricated by means of the recently developed inkjet-assisted nanotransfer printing technique. The depletion region formed at the p-n junction was directly observed by exploring the spatial distribution of photogenerated carriers along the heterojunction nanowire under various applied bias voltages. Our study provides a facile approach toward the precise characterization of charge transport in organic heterojunction systems as well as the design of efficient nanoscale organic optoelectronic devices.
authors.affiliation: Department of Chemistry, Hanyang University, Seoul, 04763, South Korea.
authors.forename: Kyung Sun
authors.initials: KS
authors.lastname: Park
authors.affiliation: Department of Chemistry, Hanyang University, Seoul, 04763, South Korea.
authors.forename: Ki Seok
authors.initials: KS
authors.lastname: Lee
authors.affiliation: Department of Chemistry, Hanyang University, Seoul, 04763, South Korea.
authors.forename: Jangmi
authors.initials: J
authors.lastname: Baek
authors.affiliation: Department of Chemistry, Hanyang University, Seoul, 04763, South Korea.
authors.forename: Lynn
authors.initials: L
authors.lastname: Lee
authors.affiliation: Department of Physics, Ajou University, Suwon, 16499, South Korea.
authors.forename: Byung Hee
authors.initials: BH
authors.lastname: Son
authors.affiliation: Department of Chemistry, Hanyang University, Seoul, 04763, South Korea.
authors.forename: Yong-Eun
authors.initials: YE
authors.lastname: Koo Lee
authors.affiliation: Department of Physics, Ajou University, Suwon, 16499, South Korea.
authors.forename: Yeong Hwan
authors.initials: YH
authors.lastname: Ahn
authors.affiliation: Department of Materials Science and Engineering, Hanyang University, Seoul, 04763, South Korea.
authors.forename: Won Il
authors.initials: WI
authors.lastname: Park
authors.affiliation: Department of Chemistry, Hanyang University, Seoul, 04763, South Korea.
authors.forename: Youngjong
authors.initials: Y
authors.lastname: Kang
authors.affiliation: Department of Chemistry, Hanyang University, Seoul, 04763, South Korea. smm@hanyang.ac.kr.
authors.forename: Myung M
authors.initials: MM
authors.lastname: Sung
keywords: nanotransfer printing; optoelectronics; organic nanowires; p-n heterojunctions; space-charge region