Impact of the Crystallite Orientation Distribution on Exciton Transport in Donor–Acceptor Conjugated Polymers

Ayzner, Alexander L.; Mei, Jianguo; Appleton, Anthony; DeLongchamp, Dean; Nardes, Alexandre; Benight, Stephanie; Kopidakis, Nikos; Toney, Michael F.; Bao, Zhenan

doi:10.1021/acsami.5b02968

Title: Impact of the Crystallite Orientation Distribution on Exciton Transport in Donor–Acceptor Conjugated Polymers

Journal Article · Fri Aug 21 00:00:00 EDT 2015 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.5b02968· OSTI ID:1370226

Ayzner, Alexander L. ^[1]; Mei, Jianguo ^[2]; Appleton, Anthony ^[2]; DeLongchamp, Dean ^[3]; Nardes, Alexandre ^[4]; Benight, Stephanie ^[2]; Kopidakis, Nikos ^[4]; Toney, Michael F. ^[5]; Bao, Zhenan ^[2]

Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Stanford Univ., CA (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)

Conjugated polymers are widely used materials in organic photovoltaic devices. Owing to their extended electronic wave functions, they often form semicrystalline thin films. In this work, we aim to understand whether distribution of crystallographic orientations affects exciton diffusion using a low-band-gap polymer backbone motif that is representative of the donor/acceptor copolymer class. Using the fact that the polymer side chain can tune the dominant crystallographic orientation in the thin film, we have measured the quenching of polymer photoluminescence, and thus the extent of exciton dissociation, as a function of crystal orientation with respect to a quenching substrate. We find that the crystallite orientation distribution has little effect on the average exciton diffusion length. Here, we suggest several possibilities for the lack of correlation between crystallographic texture and exciton transport in semicrystalline conjugated polymer films.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Molecularly Engineered Energy Materials (MEEM)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001342; KUS-C1-015-21

OSTI ID:: 1370226

Journal Information:: ACS Applied Materials and Interfaces, Vol. 7, Issue 51; Related Information: MEEM partners with University of California, Los Angeles (lead); University of California, Berkeley; Eastern Washington University; University of Kansas; National Renewable Energy Laboratory; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Title: Impact of the Crystallite Orientation Distribution on Exciton Transport in Donor–Acceptor Conjugated Polymers

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