Morphological Stability and Performance of Polymer–Fullerene Solar Cells under Thermal Stress: The Impact of Photoinduced PC60BM Oligomerization

Morphological Stability and Performance of Polymer–Fullerene Solar Cells under Thermal Stress: The Impact of Photoinduced PC60BM Oligomerization

We report a general light processing strategy for organic solar cells (OSC) that exploits the propensity of the fullerene derivative PC60BM to photo-oligomerize, which is capable of both stabilizing the polymer:PC60BM active layer morphology and enhancing the device stability under thermal annealing...

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Veröffentlicht in:ACS nano 2014-02, Vol.8 (2), p.1297-1308
Hauptverfasser: Wong, Him Cheng, Li, Zhe, Tan, Ching Hong, Zhong, Hongliang, Huang, Zhenggang, Bronstein, Hugo, McCulloch, Iain, Cabral, João T, Durrant, James R
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container_issue 2
container_start_page 1297
container_title ACS nano
container_volume 8
creator Wong, Him Cheng
Li, Zhe
Tan, Ching Hong
Zhong, Hongliang
Huang, Zhenggang
Bronstein, Hugo
McCulloch, Iain
Cabral, João T
Durrant, James R
description We report a general light processing strategy for organic solar cells (OSC) that exploits the propensity of the fullerene derivative PC60BM to photo-oligomerize, which is capable of both stabilizing the polymer:PC60BM active layer morphology and enhancing the device stability under thermal annealing. The observations hold for blends of PC60BM with an array of benchmark donor polymer systems, including P3HT, DPP-TT-T, PTB7, and PCDTBT. The morphology and kinetics of the thermally induced PC60BM crystallization within the blend films are investigated as a function of substrate and temperature. PC60BM nucleation rates on SiOx substrates exhibit a pronounced peak profile with temperature, whose maximum is polymer and blend-composition dependent. Modest illumination (
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The concurrent thermal dissociation process of PC60BM oligomers in blend films is also investigated and the activation energy of the fullerene–fullerene bond is estimated to be 0.96 ± 0.04 eV. Following light processing, the thermal stability, and thus lifetime, of PCDTBT:PC60BM devices increases for annealing times up to 150 h. In contrast, PCDTBT:PC70BM OSCs are found to be largely light insensitive. 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title Morphological Stability and Performance of Polymer–Fullerene Solar Cells under Thermal Stress: The Impact of Photoinduced PC60BM Oligomerization
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