Photovoltaic performance of block copolymer devices is independent of the crystalline texture in the active layer

Guo, Changhe; Lee, Youngmin; Lin, Yen -Hao; Strzalka, Joseph; Wang, Cheng; Hexemer, Alexander; Jaye, Cherno; Fischer, Daniel A.; Verduzco, Rafael; Wang, Qing; Gomez, Enrique D.

doi:10.1021/acs.macromol.6b00370

Title: Photovoltaic performance of block copolymer devices is independent of the crystalline texture in the active layer

Journal Article · Wed Jun 15 00:00:00 EDT 2016 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.6b00370· OSTI ID:1339567

Guo, Changhe ^[1]; Lee, Youngmin ^[1]; Lin, Yen -Hao ^[2]; Strzalka, Joseph ^[3]; Wang, Cheng ^[4]; Hexemer, Alexander ^[4]; Jaye, Cherno ^[5]; Fischer, Daniel A. ^[5]; Verduzco, Rafael ^[2]; Wang, Qing ^[1]; Gomez, Enrique D. ^[1]

The Pennsylvania State Univ., University Park, PA (United States)
Rice Univ., Houston, TX (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
National Institute of Standards and Technology, Gaithersburg, MD (United States)

The electronic properties of organic semiconductors are strongly influenced by intermolecular packing. When cast as thin films, crystalline π-conjugated molecules are strongly textured, potentially leading to anisotropic charge transport. Consequently, it is hypothesized that the orientation of crystallites in the active layer plays an important role in charge extraction and organic photovoltaic device performance. Here we demonstrate orientation control of molecular packing from mostly face-on to edge-on configurations in the active layer of P3HT-b-PFTBT block copolymer photovoltaics using 1-chloronaphthalene as a solvent additive. The effect of molecular orientations in P3HT crystals on charge transport and solar cell performance is examined. We find that optimized photovoltaic device performance is independent of the crystalline texture of P3HT. Our observations provide further insights into the molecular organization required for efficient charge transport and overall device efficiencies. The dominant crystal orientation, whether face-on or edge-on, is not critical to block copolymer solar cells. Instead, a broad distribution of crystallite orientations ensures pathways for charge transport in any direction and enables efficient charge extraction in photovoltaic devices.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: US Department of the Navy, Office of Naval Research (ONR); Lawrence Berkeley National Laboratory; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357; AC02-05CH11231

OSTI ID:: 1339567

Alternate ID(s):: OSTI ID: 1456950

Journal Information:: Macromolecules, Vol. 49, Issue 12; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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