Initial photo-degradation of PCDTBT:PC 70 BM solar cells studied under various illumination conditions: Role of the hole transport layer

Züfle, SimonFluxim AG, Switzerland; Institute of Computational Physics, ZHAW, Switzerland (author)

Initial photo-degradation of PCDTBT:PC 70 BM solar cells studied under various illumination conditions : Role of the hole transport layer

Publicerad i Hanssons doktorsavhandling Materials and Device Engineering for Efficient and Stable Polymer Solar Cells som manuskript med titeln: "The role of the hole transport layer in the initial photo-degradation of PCDTBTPC70BM solar cells"
ncapsulated organic solar cells often show a burn-in behaviour under illumination. This burn-in manifests itself as a rapid performance loss followed by a much slower progression of the degradation. Here we investigate the burn-in for PCDTBT:PC 70 BM solar cells under a wide range of illumination intensities. We find that increasing the sunlight concentration from 1 Sun to up to 100 Suns does not change the degradation behaviour, i.e. the dependence of all principal photovoltaic parameters on the dose of solar exposure (in Sun hours). This suggests that the degradation mechanisms under solar concentration (≤100 Suns) are the same as those observed under 1 Sun. This result makes it possible to use concentrated sunlight for accelerated stability assessment of these devices. We also find that devices with PEDOT:PSS as hole transport material show a rapid drop in open-circuit voltage of around 100 mV during the first Sun hour of light exposure. By replacing PEDOT:PSS with MoO 3 this initial process can be prevented and only the much slower part of the photo-degradation takes place.

Hansson, Rickard,1987-Karlstads universitet,Institutionen för ingenjörsvetenskap och fysik (from 2013)(Swepub:kau)rickhans (author)
Katz, Eugene A.The Ben-Gurion University of the Negev, Israel (author)
Moons, Ellen,professor,1966-Karlstads universitet,Institutionen för ingenjörsvetenskap och fysik (from 2013)(Swepub:kau)ellemoon (author)
Fluxim AG, Switzerland; Institute of Computational Physics, ZHAW, SwitzerlandInstitutionen för ingenjörsvetenskap och fysik (from 2013) (creator_code:org_t)

By the author/editor: Züfle, Simon; Hansson, Rickard ...; Katz, Eugene A.; Moons, Ellen, pr ...

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