Chemical degradation mechanisms of organic photovoltaics studied by TOF-SIMS and isotopic labeling

Kion Norrman; Frederik C. Krebs

doi:10.1117/12.613433

3 October 2005 Chemical degradation mechanisms of organic photovoltaics studied by TOF-SIMS and isotopic labeling

Kion Norrman, Frederik C. Krebs

Proceedings Volume 5938, Organic Photovoltaics VI; 59380D (2005) https://doi.org/10.1117/12.613433
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The degradation mechanisms of conjugated polymer materials used in organic photovoltaic cells were studied. To elucidate the parts of the degradation mechanisms induced by molecular oxygen, isotopic labeling was employed in conjunction with time-of-flight secondary ion mass spectrometry (TOF-SIMS). Devices that were kept in the dark were compared with devices that had been subjected to illumination under simulated sunlight. It was found that molecular oxygen diffuses into the device causing oxygen-containing species to be generated throughout the active layers. The isotopic labeling combined with TOF-SIMS depth profiling and imaging allowed mapping of the oxidation processes by measuring the vertical and lateral distribution of oxygen-containing species. The exact pinpointing of the parts of the device that are susceptible to oxidation allows for a mechanism to be proposed that partly explains the device failure manifested in the insufficient life times of the organic photovoltaics.

Citation Download Citation

Kion Norrman and Frederik C. Krebs "Chemical degradation mechanisms of organic photovoltaics studied by TOF-SIMS and isotopic labeling", Proc. SPIE 5938, Organic Photovoltaics VI, 59380D (3 October 2005); https://doi.org/10.1117/12.613433

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