Semiconducting Carbon Nanotubes for Improved Efficiency and Thermal Stability of Polymer-Fullerene Solar Cells

Autor: Joon Hak Oh, Lydia Helena Wong, Hang-Woo Lee, Yeng Ming Lam, Teddy Salim, Zhenan Bao
Rok vydání: 2015
Předmět:
Zdroj: Advanced Functional Materials. 26:51-65
ISSN: 1616-301X
DOI: 10.1002/adfm.201503256
Popis: The effects of the incorporation of semiconducting single-walled nanotubes (sc-SWNTs) with high purity on the bulk heterojunction (BHJ) organic solar cell (OSC) based on regioregular poly(3-hexylthiophene-2,5-diyl):[6,6]-phenylC 61 -butyric acid methyl ester (rr-P3HT:PCBM) are reported for the fi rst time. The sc-SWNTs induce the organization of the polymer phase, which is evident from the increase in crystallite size, the red-shifted absorption characteristics and the enhanced hole mobility. By incorporating sc-SWNTs, OSC with a power conversion effi ciency (PCE) as high as 4% can be achieved, which is ≈8% higher than our best control device. A novel application of sc-SWNTs in improving the thermal stability of BHJ OSCs is also demonstrated. After heating at 150 °C for 9 h, it is observed that the thermal stability of rr-P3HT:PCBM devices improves by more than fi vefold with inclusion of sc-SWNTs. The thermal stability enhancement is attributed to a more suppressed phase separation, as shown by the remarkable decrease in the formation of sizeable crystals, which in turn can be the outcome of a more controlled crystallization of the blend materials on the nanotubes.
Databáze: OpenAIRE
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