%0 Journal Article %1 AENM:AENM201601138 %A Ye, Long %A Jiao, Xuechen %A Zhang, Shaoqing %A Yao, Huifeng %A Qin, Yunpeng %A Ade, Harald %A Hou, Jianhui %D 2016 %J Advanced Energy Materials %K additionally copolymer organic %P n/a--n/a %R 10.1002/aenm.201601138 %T Control of Mesoscale Morphology and Photovoltaic Performance in Diketopyrrolopyrrole-Based Small Band Gap Terpolymers %U http://dx.doi.org/10.1002/aenm.201601138 %X Morphology control is one of the key strategies in optimizing the performance of organic photovoltaic materials, particularly for diketopyrrolopyrrole (DPP)-based donor polymers. The design of DPP-based polymers that provide high power conversion efficiency (PCE) presents a significant challenge that requires optimization of both energetics and morphology. Herein, a series of high performance, small band gap DPP-based terpolymers are designed via two-step side chain engineering, namely introducing alternating short and long alkyls for reducing the domain spacing and inserting alkylthio for modulating the energy levels. The new DPP-based terpolymers are compared to delineate how the side chain impacts the mesoscale morphology. By employing the alkylthio-substituted terpolymer PBDPP-TS, the new polymer solar cell (PSC) device realizes a good balance of a high Voc of 0.77 V and a high Jsc over 15 mA cm−2, and thus realizes desirable PCE in excess of 8% and 9.5% in single junction and tandem PSC devices, respectively. The study indicates better control of domain purity will greatly improve performance of single junction DPP-based PSCs toward 10% efficiency. More significantly, the utility of this stepwise side chain engineering can be readily expanded to other classes of well-defined copolymers and triggers efficiency breakthroughs in novel terpolymers for photovoltaic and related electronic applications.

@article{AENM:AENM201601138, abstract = {Morphology control is one of the key strategies in optimizing the performance of organic photovoltaic materials, particularly for diketopyrrolopyrrole (DPP)-based donor polymers. The design of DPP-based polymers that provide high power conversion efficiency (PCE) presents a significant challenge that requires optimization of both energetics and morphology. Herein, a series of high performance, small band gap DPP-based terpolymers are designed via two-step side chain engineering, namely introducing alternating short and long alkyls for reducing the domain spacing and inserting alkylthio for modulating the energy levels. The new DPP-based terpolymers are compared to delineate how the side chain impacts the mesoscale morphology. By employing the alkylthio-substituted terpolymer PBDPP-TS, the new polymer solar cell (PSC) device realizes a good balance of a high Voc of 0.77 V and a high Jsc over 15 mA cm−2, and thus realizes desirable PCE in excess of 8% and 9.5% in single junction and tandem PSC devices, respectively. The study indicates better control of domain purity will greatly improve performance of single junction DPP-based PSCs toward 10% efficiency. More significantly, the utility of this stepwise side chain engineering can be readily expanded to other classes of well-defined copolymers and triggers efficiency breakthroughs in novel terpolymers for photovoltaic and related electronic applications.}, added-at = {2016-11-02T11:05:52.000+0100}, author = {Ye, Long and Jiao, Xuechen and Zhang, Shaoqing and Yao, Huifeng and Qin, Yunpeng and Ade, Harald and Hou, Jianhui}, biburl = {https://www.bibsonomy.org/bibtex/211c879b4b3e6f8809ee7dd977627fbc0/bretschneider_m}, description = {Control of Mesoscale Morphology and Photovoltaic Performance in Diketopyrrolopyrrole-Based Small Band Gap Terpolymers - Ye - 2016 - Advanced Energy Materials - Wiley Online Library}, doi = {10.1002/aenm.201601138}, interhash = {180ed51ae2d919d686e76a225952f152}, intrahash = {11c879b4b3e6f8809ee7dd977627fbc0}, issn = {1614-6840}, journal = {Advanced Energy Materials}, keywords = {additionally copolymer organic}, pages = {n/a--n/a}, timestamp = {2016-11-02T11:05:52.000+0100}, title = {Control of Mesoscale Morphology and Photovoltaic Performance in Diketopyrrolopyrrole-Based Small Band Gap Terpolymers}, url = {http://dx.doi.org/10.1002/aenm.201601138}, year = 2016 }