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Measuring domain sizes and compositional heterogeneities in P3HT-PCBM bulk heterojunction thin films with 1H spin diffusion NMR spectroscopy

Published

Author(s)

Ryan C. Nieuwendaal, Hyun Wook Ro, David Germack, Regis J. Kline, Calvin Chan, Amit K. Agrawal, David J. Gundlach, David L. VanderHart, Dean M. DeLongchamp

Abstract

In this manuscript we show that 1H spin diffusion NMR is a valuable method for estimating the domain sizes in thin films of a polymer-fullerene blend for bulk heterojunction (BHJ) photovoltaics. Variations in common BHJ film processing parameters have dramatic effects on the domain sizes in the blend films, which in turn affect power conversion efficiency. Spin-coating rotational speed, thermal annealing schedule, and solvent annealing all strongly affect BHJ morphology. The 1H spin diffusion NMR data clearly show that films spun at fast speeds are primarily composed of small (
Citation
Advanced Functional Materials

Keywords

ORGANIC PHOTOVOLTAICS, BULK HETEROJUNCTION, SOLID-STATE NMR, DOMAIN SIZE, MORPHOLOGY

Citation

Nieuwendaal, R. , , H. , Germack, D. , Kline, R. , Chan, C. , Agrawal, A. , Gundlach, D. , VanderHart, D. and DeLongchamp, D. (2012), Measuring domain sizes and compositional heterogeneities in P3HT-PCBM bulk heterojunction thin films with 1H spin diffusion NMR spectroscopy, Advanced Functional Materials, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=908099 (Accessed July 31, 2021)
Created March 21, 2012, Updated February 19, 2017