%0 Journal Article %1 yuan2018improved %A Yuan, Jianyu %A Ford, Michael J. %A Xu, Yalong %A Zhang, Yannan %A Bazan, Guillermo C. %A Ma, Wanli %D 2018 %I Wiley Online Library %J Advanced Energy Materials %K new_material nonfullerene organic tandem_solar_cells %N 14 %R 10.1002/aenm.201703291 %T Improved Tandem All‐Polymer Solar Cells Performance by Using Spectrally Matched Subcells %U https://doi.org/10.1002/aenm.201703291 %V 8 %X All‐polymer solar cells (all‐PSCs) are attractive as alternatives to fabricate thermally and mechanically stable solar cells, especially with recent improvements in their power conversion efficiency (PCE). In this work, efficient all‐PSCs with near‐infrared response (up to 850 nm) are developed using newly designed regioregular polymer donors with relatively narrow optical gap. These all‐PSCs systems achieve PCEs up to 6.0% after incorporating fluorine into the polymer backbone. More importantly, these polymers exhibit absorbance that is complementary to previously reported wide bandgap polymer donors. Thus, the superior properties of the newly designed polymers afford opportunities to fabricate the first spectrally matched all‐polymer tandem solar cells with high performance. A PCE of 8.3% is then demonstrated which is the highest efficiency so far for all‐polymer tandem solar cells. The design of narrow bandgap polymers provides new directions to enhance the PCE of emerging single‐junction and tandem all polymer solar cells. By adopting D1‐A‐D2‐A ternary structure, a pair of novel regioregular polymers, namely PBBSB and PBFSF, are synthesized. Benefiting from the new arrangement and molecular fluorination, the polymer exhibits relatively narrow optical gap, good intermolecular packing, and excellent charge transport. More importantly, it is shown that these functional donor polymers can achieve high efficiency in either single‐junction or tandem all‐polymer solar cells.

@article{yuan2018improved, abstract = {All‐polymer solar cells (all‐PSCs) are attractive as alternatives to fabricate thermally and mechanically stable solar cells, especially with recent improvements in their power conversion efficiency (PCE). In this work, efficient all‐PSCs with near‐infrared response (up to 850 nm) are developed using newly designed regioregular polymer donors with relatively narrow optical gap. These all‐PSCs systems achieve PCEs up to 6.0% after incorporating fluorine into the polymer backbone. More importantly, these polymers exhibit absorbance that is complementary to previously reported wide bandgap polymer donors. Thus, the superior properties of the newly designed polymers afford opportunities to fabricate the first spectrally matched all‐polymer tandem solar cells with high performance. A PCE of 8.3% is then demonstrated which is the highest efficiency so far for all‐polymer tandem solar cells. The design of narrow bandgap polymers provides new directions to enhance the PCE of emerging single‐junction and tandem all polymer solar cells. By adopting D1‐A‐D2‐A ternary structure, a pair of novel regioregular polymers, namely PBBSB and PBFSF, are synthesized. Benefiting from the new arrangement and molecular fluorination, the polymer exhibits relatively narrow optical gap, good intermolecular packing, and excellent charge transport. More importantly, it is shown that these functional donor polymers can achieve high efficiency in either single‐junction or tandem all‐polymer solar cells.}, added-at = {2018-07-03T10:55:40.000+0200}, author = {Yuan, Jianyu and Ford, Michael J. and Xu, Yalong and Zhang, Yannan and Bazan, Guillermo C. and Ma, Wanli}, biburl = {https://www.bibsonomy.org/bibtex/21bb3176a8eab21745e2ef496a1973f19/bretschneider_m}, doi = {10.1002/aenm.201703291}, interhash = {6941d9d20e92a97206c704942e79dd1f}, intrahash = {1bb3176a8eab21745e2ef496a1973f19}, issn = {1614-6832}, journal = {Advanced Energy Materials}, keywords = {new_material nonfullerene organic tandem_solar_cells}, month = {5}, number = 14, publisher = {Wiley Online Library}, timestamp = {2018-07-03T10:55:40.000+0200}, title = {Improved Tandem All‐Polymer Solar Cells Performance by Using Spectrally Matched Subcells}, url = {https://doi.org/10.1002/aenm.201703291}, volume = 8, year = 2018 }