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.
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
%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
}