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Title: High efficiency and stability small molecule solar cells developed by bulk microstructure fine-tuning

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1397374
Grant/Contract Number:
FG02-98ER45737
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Nano Energy
Additional Journal Information:
Journal Volume: 28; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 21:17:09; Journal ID: ISSN 2211-2855
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Min, Jie, Jiao, Xuechen, Sgobba, Vito, Kan, Bin, Heumüller, Thomas, Rechberger, Stefanie, Spiecker, Erdmann, Guldi, Dirk M., Wan, Xiangjian, Chen, Yongsheng, Ade, Harald, and Brabec, Christoph J. High efficiency and stability small molecule solar cells developed by bulk microstructure fine-tuning. Netherlands: N. p., 2016. Web. doi:10.1016/j.nanoen.2016.08.047.
Min, Jie, Jiao, Xuechen, Sgobba, Vito, Kan, Bin, Heumüller, Thomas, Rechberger, Stefanie, Spiecker, Erdmann, Guldi, Dirk M., Wan, Xiangjian, Chen, Yongsheng, Ade, Harald, & Brabec, Christoph J. High efficiency and stability small molecule solar cells developed by bulk microstructure fine-tuning. Netherlands. doi:10.1016/j.nanoen.2016.08.047.
Min, Jie, Jiao, Xuechen, Sgobba, Vito, Kan, Bin, Heumüller, Thomas, Rechberger, Stefanie, Spiecker, Erdmann, Guldi, Dirk M., Wan, Xiangjian, Chen, Yongsheng, Ade, Harald, and Brabec, Christoph J. 2016. "High efficiency and stability small molecule solar cells developed by bulk microstructure fine-tuning". Netherlands. doi:10.1016/j.nanoen.2016.08.047.
@article{osti_1397374,
title = {High efficiency and stability small molecule solar cells developed by bulk microstructure fine-tuning},
author = {Min, Jie and Jiao, Xuechen and Sgobba, Vito and Kan, Bin and Heumüller, Thomas and Rechberger, Stefanie and Spiecker, Erdmann and Guldi, Dirk M. and Wan, Xiangjian and Chen, Yongsheng and Ade, Harald and Brabec, Christoph J.},
abstractNote = {},
doi = {10.1016/j.nanoen.2016.08.047},
journal = {Nano Energy},
number = C,
volume = 28,
place = {Netherlands},
year = 2016,
month =
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.nanoen.2016.08.047

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  • Structural characteristics of the active layers in organic photovoltaic (OPV) devices play a critical role in charge generation, separation and transport. Here we report on morphology and structural control of p-DTS(FBTTh 2) 2:PC 71BM films by means of thermal annealing and 1,8-diiodooctane (DIO) solvent additive processing, and correlate it to the device performance. By combining surface imaging with nanoscale depth-sensitive neutron reflectometry (NR) and X-ray diffraction, three-dimensional morphologies of the films are reconstituted with information extending length scales from nanometers to microns. DIO promotes the formation of a well-mixed donor-acceptor vertical phase morphology with a large population of small p-DTS(FBTTh2)2more » nanocrystals arranged in an elongated domain network of the film, thereby enhancing the device performance. In contrast, films without DIO exhibit three-sublayer vertical phase morphology with phase separation in agglomerated domains. Our findings are supported by thermodynamic description based on the Flory-Huggins theory with quantitative evaluation of pairwise interaction parameters that explain the morphological changes resulting from thermal and solvent treatments. Our study reveals that vertical phase morphology of small-molecule based OPVs is significantly different from polymer-based systems. Lastly, the significant enhancement of morphology and information obtained from theoretical modeling may aid in developing an optimized morphology to enhance device performance for OPVs.« less
  • Structural characteristics of the active layers in organic photovoltaic (OPV) devices play a critical role in charge generation, separation and transport. Here we report on morphology and structural control of p-DTS(FBTTh 2) 2:PC 71BM films by means of thermal annealing and 1,8-diiodooctane (DIO) solvent additive processing, and correlate it to the device performance. By combining surface imaging with nanoscale depth-sensitive neutron reflectometry (NR) and X-ray diffraction, three-dimensional morphologies of the films are reconstituted with information extending length scales from nanometers to microns. DIO promotes the formation of a well-mixed donor-acceptor vertical phase morphology with a large population of small p-DTS(FBTThmore » 2) 2 nanocrystals arranged in an elongated domain network of the film, thereby enhancing the device performance. In contrast, films without DIO exhibit three-sublayer vertical phase morphology with phase separation in agglomerated domains. Our findings are supported by thermodynamic description based on the Flory-Huggins theory with quantitative evaluation of pairwise interaction parameters that explain the morphological changes resulting from thermal and solvent treatments. Our study reveals that vertical phase morphology of small-molecule based OPVs is significantly different from polymer-based systems. In conclusion, the significant enhancement of morphology and information obtained from theoretical modeling may aid in developing an optimized morphology to enhance device performance for OPVs.« less