%0 Journal Article %1 AENM:AENM201502265 %A Sundqvist, Anton %A Sandberg, Oskar J. %A Nyman, Mathias %A Smått, Jan-Henrik %A Österbacka, Ronald %D 2016 %J Advanced Energy Materials %K inverted organic %N 6 %P n/a--n/a %R 10.1002/aenm.201502265 %T Origin of the S-Shaped JV Curve and the Light-Soaking Issue in Inverted Organic Solar Cells %U http://dx.doi.org/10.1002/aenm.201502265 %V 6 %X Inverted organic solar cells generally exhibit a strong s-shaped kink in the current–voltage characteristics (JV curve) that may be removed by exposure to UV light (light-soaking) leading to a drastically improved performance. Using in-device characterization methods the origin of the light-soaking issue in inverted solar cells employing titanium dioxide (TiO2) as an electron selective layer is clarified. An injected hole reservoir accumulated at the TiO2/organic interface of the pristine device is observed from extraction current transients; the hole reservoir increases the recombination and results in an s-shape in the JV curve of pristine devices. The hole reservoir and the s-shape is a result of the energetics at the selective contact in the pristine device; the effect of UV exposure is to decrease the work function of the indium tin oxide/TiO2-contact, increasing the built-in potential. This hinders the build-up of the hole reservoir and the s-shape is removed. The proposed model is in excellent agreement with drift-diffusion simulations.

@article{AENM:AENM201502265, abstract = {Inverted organic solar cells generally exhibit a strong s-shaped kink in the current–voltage characteristics (JV curve) that may be removed by exposure to UV light (light-soaking) leading to a drastically improved performance. Using in-device characterization methods the origin of the light-soaking issue in inverted solar cells employing titanium dioxide (TiO2) as an electron selective layer is clarified. An injected hole reservoir accumulated at the TiO2/organic interface of the pristine device is observed from extraction current transients; the hole reservoir increases the recombination and results in an s-shape in the JV curve of pristine devices. The hole reservoir and the s-shape is a result of the energetics at the selective contact in the pristine device; the effect of UV exposure is to decrease the work function of the indium tin oxide/TiO2-contact, increasing the built-in potential. This hinders the build-up of the hole reservoir and the s-shape is removed. The proposed model is in excellent agreement with drift-diffusion simulations.}, added-at = {2016-08-19T09:59:17.000+0200}, author = {Sundqvist, Anton and Sandberg, Oskar J. and Nyman, Mathias and Smått, Jan-Henrik and Österbacka, Ronald}, biburl = {https://www.bibsonomy.org/bibtex/226b57c55f9334d902841facc81774e6c/bretschneider_m}, description = {Origin of the S-Shaped JV Curve and the Light-Soaking Issue in Inverted Organic Solar Cells - Sundqvist - 2016 - Advanced Energy Materials - Wiley Online Library}, doi = {10.1002/aenm.201502265}, interhash = {19ab509175b84a4d3f4355641febae77}, intrahash = {26b57c55f9334d902841facc81774e6c}, issn = {1614-6840}, journal = {Advanced Energy Materials}, keywords = {inverted organic}, number = 6, pages = {n/a--n/a}, timestamp = {2016-08-19T09:59:17.000+0200}, title = {Origin of the S-Shaped JV Curve and the Light-Soaking Issue in Inverted Organic Solar Cells}, url = {http://dx.doi.org/10.1002/aenm.201502265}, volume = 6, year = 2016 }