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Selective carrier transport enhancement in bulk-heterojunction organic photovoltaics with nitrogen or boron doped carbon nanotubes

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4 Author(s)
Hyung Il Park ; Department of Materials Science and Engineering, KAIST, Daejeon, 305-701, Republic of Korea ; Ju Min Lee ; Ji Sun Park ; Sang Ouk Kim

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%.

Published in:

Nanotechnology Materials and Devices Conference (NMDC), 2011 IEEE

Date of Conference:

18-21 Oct. 2011