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Title: The Impact of Fullerene Structure on its Miscibility with P3HT and its Correlation of Performance in Organic Photovoltaics.

Abstract

Neutron reflectivity experiments are utilized to obtain the miscibility limit of four different fullerenes, bis-PCBM, ICBA, thio-PCBM, and PC70BM, in poly(3-hexylthiophene) (P3HT). The intermixing of P3HT and fullerene bilayers is monitored by neutron reflectivity before and after thermal annealing, providing quantification of the miscibility and interdiffusion of the fullerene within P3HT. These results indicate that the miscibility limit of these fullerenes in P3HT ranges from 11% to 26%, where the bis-adduct fullerenes exhibit lower miscibility in P3HT, which is also verified by small angle neutron scatting (SANS). The in-plane morphology of the P3HT:fullerene mixtures was also examined by SANS, which shows a decrease in domain size and an increase in the specific interfacial area between the fullerene and the polymer with the bis-fullerenes. Correlation of miscibility and morphology to device performance indicates that polymer/fullerene miscibility is crucial to rationally optimize the design of fullerenes for use in organic photovoltaics. Bis-PCBM has a higher open circuit voltage (Voc) than PC60BM with P3HT; however, device performance of bis-PCBM based devices is lower than that of PC60BM based devices. This decrease in performance is attributed to the lower miscibility of bis-PCBM in P3HT, which decreases the probability of exciton dissociation and enhances themore » recombination of free charge carriers in the miscible region. Moreover, the minimum distance between fullerenes in the miscible region to facilitate intermolecular transport is identified as 11 .« less

Authors:
 [1];  [1];  [2];  [1]
  1. ORNL
  2. University of Tennessee, Knoxville (UTK)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1136839
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 26; Journal Issue: 13; Journal ID: ISSN 0897--4756
Country of Publication:
United States
Language:
English

Citation Formats

Chen, Huipeng, Hsiao, Yu-Che, Hu, Bin, and Dadmun, Mark D. The Impact of Fullerene Structure on its Miscibility with P3HT and its Correlation of Performance in Organic Photovoltaics.. United States: N. p., 2014. Web. doi:10.1021/cm5015898.
Chen, Huipeng, Hsiao, Yu-Che, Hu, Bin, & Dadmun, Mark D. The Impact of Fullerene Structure on its Miscibility with P3HT and its Correlation of Performance in Organic Photovoltaics.. United States. https://doi.org/10.1021/cm5015898
Chen, Huipeng, Hsiao, Yu-Che, Hu, Bin, and Dadmun, Mark D. 2014. "The Impact of Fullerene Structure on its Miscibility with P3HT and its Correlation of Performance in Organic Photovoltaics.". United States. https://doi.org/10.1021/cm5015898.
@article{osti_1136839,
title = {The Impact of Fullerene Structure on its Miscibility with P3HT and its Correlation of Performance in Organic Photovoltaics.},
author = {Chen, Huipeng and Hsiao, Yu-Che and Hu, Bin and Dadmun, Mark D},
abstractNote = {Neutron reflectivity experiments are utilized to obtain the miscibility limit of four different fullerenes, bis-PCBM, ICBA, thio-PCBM, and PC70BM, in poly(3-hexylthiophene) (P3HT). The intermixing of P3HT and fullerene bilayers is monitored by neutron reflectivity before and after thermal annealing, providing quantification of the miscibility and interdiffusion of the fullerene within P3HT. These results indicate that the miscibility limit of these fullerenes in P3HT ranges from 11% to 26%, where the bis-adduct fullerenes exhibit lower miscibility in P3HT, which is also verified by small angle neutron scatting (SANS). The in-plane morphology of the P3HT:fullerene mixtures was also examined by SANS, which shows a decrease in domain size and an increase in the specific interfacial area between the fullerene and the polymer with the bis-fullerenes. Correlation of miscibility and morphology to device performance indicates that polymer/fullerene miscibility is crucial to rationally optimize the design of fullerenes for use in organic photovoltaics. Bis-PCBM has a higher open circuit voltage (Voc) than PC60BM with P3HT; however, device performance of bis-PCBM based devices is lower than that of PC60BM based devices. This decrease in performance is attributed to the lower miscibility of bis-PCBM in P3HT, which decreases the probability of exciton dissociation and enhances the recombination of free charge carriers in the miscible region. Moreover, the minimum distance between fullerenes in the miscible region to facilitate intermolecular transport is identified as 11 .},
doi = {10.1021/cm5015898},
url = {https://www.osti.gov/biblio/1136839}, journal = {Chemistry of Materials},
issn = {0897--4756},
number = 13,
volume = 26,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 2014},
month = {Wed Jan 01 00:00:00 EST 2014}
}