%0 Journal Article %1 AENM:AENM201601379 %A Stolterfoht, Martin %A Shoaee, Safa %A Armin, Ardalan %A Jin, Hui %A Kassal, Ivan %A Jiang, Wei %A Burn, Paul %A Meredith, Paul %D 2016 %J Advanced Energy Materials %K organic recombination %P n/a--n/a %R 10.1002/aenm.201601379 %T Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells %U http://dx.doi.org/10.1002/aenm.201601379 %X The origin of photocurrent losses in the power-generating regime of organic solar cells (OSCs) remains a controversial topic, although recent literature suggests that the competition between bimolecular recombination and charge extraction determines the bias dependence of the photocurrent. Here the steady-state recombination dynamics is studied in bulk-heterojunction OSCs with different hole mobilities from short-circuit to maximum power point. It is shown that in this regime, in contrast to previous transient extracted charge and absorption spectroscopy studies, first-order recombination outweighs bimolecular recombination of photogenerated charge carriers. This study demonstrates that the first-order losses increase with decreasing slower carrier mobility, and attributes them to either mobilization of charges trapped at the donor:acceptor interface through the Poole–Frenkel effect, and/or recombination of photogenerated and injected charges. The dependence of both first-order and higher-order losses on the slower carrier mobility explains why the field dependence of OSC efficiencies has historically been attributed to charge-extraction losses.

@article{AENM:AENM201601379, abstract = {The origin of photocurrent losses in the power-generating regime of organic solar cells (OSCs) remains a controversial topic, although recent literature suggests that the competition between bimolecular recombination and charge extraction determines the bias dependence of the photocurrent. Here the steady-state recombination dynamics is studied in bulk-heterojunction OSCs with different hole mobilities from short-circuit to maximum power point. It is shown that in this regime, in contrast to previous transient extracted charge and absorption spectroscopy studies, first-order recombination outweighs bimolecular recombination of photogenerated charge carriers. This study demonstrates that the first-order losses increase with decreasing slower carrier mobility, and attributes them to either mobilization of charges trapped at the donor:acceptor interface through the Poole–Frenkel effect, and/or recombination of photogenerated and injected charges. The dependence of both first-order and higher-order losses on the slower carrier mobility explains why the field dependence of OSC efficiencies has historically been attributed to charge-extraction losses.}, added-at = {2016-11-24T10:48:56.000+0100}, author = {Stolterfoht, Martin and Shoaee, Safa and Armin, Ardalan and Jin, Hui and Kassal, Ivan and Jiang, Wei and Burn, Paul and Meredith, Paul}, biburl = {https://www.bibsonomy.org/bibtex/22b83e45f7880c0762751628c160c53af/bretschneider_m}, description = {Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells - Stolterfoht - 2016 - Advanced Energy Materials - Wiley Online Library}, doi = {10.1002/aenm.201601379}, interhash = {00646001fa44f5bba0ae96f20b26c05e}, intrahash = {2b83e45f7880c0762751628c160c53af}, issn = {1614-6840}, journal = {Advanced Energy Materials}, keywords = {organic recombination}, pages = {n/a--n/a}, timestamp = {2016-11-24T10:48:56.000+0100}, title = {Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells}, url = {http://dx.doi.org/10.1002/aenm.201601379}, year = 2016 }