title: Systematic conversion of single walled carbon nanotubes into n-type thermoelectric materials by molecular dopants.
abstract: Thermoelectrics is a challenging issue for modern and future energy conversion and recovery technology. Carbon nanotubes are promising active thermoelectic materials owing to their narrow bandgap energy and high charge carrier mobility, and they can be integrated into flexible thermoelectrics that can recover any waste heat. We here report air-stable n-type single walled carbon nanotubes with a variety of weak electron donors in the range of HOMO level between ca. -4.4 eV and ca. -5.6 eV, in which partial uphill electron injection from the dopant to the conduction band of single walled carbon nanotubes is dominant. We display flexible films of the doped single walled carbon nanotubes possessing significantly large thermoelectric effect, which is applicable to flexible ambient thermoelectric modules.
authors.affiliation: Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Nonoguchi
authors.forename: Kenji
authors.initials: K
authors.lastname: Ohashi
authors.forename: Rui
authors.initials: R
authors.lastname: Kanazawa
authors.forename: Koji
authors.initials: K
authors.lastname: Ashiba
authors.forename: Kenji
authors.initials: K
authors.lastname: Hata
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Nakagawa
authors.forename: Chihaya
authors.initials: C
authors.lastname: Adachi
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Tanase
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Kawai