NDLI: Spectroscopically tracking charge separation in polymer : fullerene blends with a three-phase morphology

Content Provider	Royal Society of Chemistry (RSC)
Author	Hodgkiss, Justin M. Kim, Taehyo Woo, Han Young Uddin, Mohammad A. Prasad, Shyamal K. K. Kim, Jin Young Gallaher, Joseph K.
Copyright Year	2015
Abstract	The coexistence of intermixed amorphous polymer : fullerene phases alongside pure semicrystalline polymer and fullerene phases provides a plausible explanation for effective charge separation in organic photovoltaic blends by providing a cascaded energy landscape. We sought to test this proposal by spectroscopically tracking charge dynamics in 3-phase blends compared with binary counterparts and linking these dynamics to free charge yields. Our study applies broadband transient absorption spectroscopy to a series of closely related alternating thiophene–benzothiadiazole copolymers in which the tuned curvature of the polymer backbone controls the nature and degree of polymer–fullerene intermixing. Free charge generation is most efficient in the 3-phase morphology that features intimately mixed polymer : PCBM regions amongst neat polymer and PCBM phases. TA spectral dynamics and polarization anisotropy measurements reveal the sub-nanosecond migration of holes from intermixed to pure polymer regions of such blends. In contrast, 2-phase blends lack the spectral dynamics of this charge migration process and suffer from severe geminate recombination losses. These results provide valuable spectroscopic evidence for an efficient charge separation pathway that relies on the 3-phase morphology.
Starting Page	2713
Ending Page	2724
Page Count	12
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	8
Issue Number	9
Journal	Energy & Environmental Science
DOI	10.1039/c5ee01713k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Polymer Fullerene Solar cell Absorption spectroscopy General relativity Phenyl-C61-butyric acid methyl ester Anisotropy Gemination Carrier generation and recombination
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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