DocumentCode :
3365045
Title :
Selective carrier transport enhancement in bulk-heterojunction organic photovoltaics with nitrogen or boron doped carbon nanotubes
Author :
Hyung Il Park ; Lee, Ju Min ; Park, Hyung Il ; Kim, Sang Ouk
Author_Institution :
Dept. of Mater. Sci. & Eng., KAIST, Daejeon, South Korea
fYear :
2011
fDate :
18-21 Oct. 2011
Firstpage :
476
Lastpage :
481
Abstract :
We present the remarkable performance improvement of organic solar cells upon incorporating N- or B-doped carbon nanotubes (CNTs) into the organic semiconductor active layer. A small amount (0.2-5.0 wt%) of doped multi-walled CNTs are added to the bulk-heterojuction of poly(3-hexylthiophene) (P3HT) and 1-(3-methoxycarbonyl) propyl-1-phenyl[6,6]C61 (PCBM). Unlike undoped metallic multi-walled CNTs, which cause undesired electron-hole recombination, N- or B-doped CNTs uniformly dispersed in the active layer selectively enhance electron or hole transport, respectively, and eventually help carrier collection. Specifically, the incorporation of 1.0 wt% B-doped CNTs results in a balanced electron and hole transport and accomplishes a power conversion efficiency improvement from 3.0% (conventional control cells without CNTs) to 4.1%.
Keywords :
boron; carbon nanotubes; nanotube devices; nitrogen; organic semiconductors; power conversion; semiconductor heterojunctions; solar cells; 1-(3-methoxycarbonyl) propyl-1-phenyl[6,6]C61; C:B; C:N; boron doped carbon nanotubes; bulk-heterojunction organic photovoltaics; carrier collection; electron transport; hole transport; nitrogen doped carbon nanotubes; organic semiconductor active layer; organic solar cells; poly(3-hexylthiophene); power conversion efficiency; selective carrier transport enhancement; Charge carrier processes; Nanotubes; Nitrogen; RNA; Radiative recombination;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nanotechnology Materials and Devices Conference (NMDC), 2011 IEEE
Conference_Location :
Jeju
Print_ISBN :
978-1-4577-2139-7
Type :
conf
DOI :
10.1109/NMDC.2011.6155412
Filename :
6155412
Link To Document :
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