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

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. That is, the dominant crystal orientation, whether face-on or edge-on, is not critical to organic solar cells. Furthermore, a broad distribution of crystallite orientations ensures pathways for charge transport in any direction and enables efficient charge extraction in photovoltaic devices.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [5] ;  [2] ;  [1] ;  [1]
  1. The Pennsylvania State Univ., University Park, PA (United States)
  2. Rice Univ., Houston, TX (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. National Institute of Standards and Technology, Gaithersburg, MD (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Macromolecules
Additional Journal Information:
Journal Volume: 49; Journal Issue: 12; Journal ID: ISSN 0024-9297
Publisher:
American Chemical Society
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
US Department of the Navy, Office of Naval Research (ONR); Lawrence Berkeley National Laboratory; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; GIWAXS; RSOXS; all-conjugated block copolymers; crystalline orientation; organic photovoltaics
OSTI Identifier:
1339567
Alternate Identifier(s):
OSTI ID: 1456950

Guo, Changhe, Lee, Youngmin, Lin, Yen -Hao, Strzalka, Joseph, Wang, Cheng, Hexemer, Alexander, Jaye, Cherno, Fischer, Daniel A., Verduzco, Rafael, Wang, Qing, and Gomez, Enrique D.. Photovoltaic performance of block copolymer devices is independent of the crystalline texture in the active layer. United States: N. p., Web. doi:10.1021/acs.macromol.6b00370.
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.. Photovoltaic performance of block copolymer devices is independent of the crystalline texture in the active layer. United States. doi:10.1021/acs.macromol.6b00370.
Guo, Changhe, Lee, Youngmin, Lin, Yen -Hao, Strzalka, Joseph, Wang, Cheng, Hexemer, Alexander, Jaye, Cherno, Fischer, Daniel A., Verduzco, Rafael, Wang, Qing, and Gomez, Enrique D.. 2016. "Photovoltaic performance of block copolymer devices is independent of the crystalline texture in the active layer". United States. doi:10.1021/acs.macromol.6b00370. https://www.osti.gov/servlets/purl/1339567.
@article{osti_1339567,
title = {Photovoltaic performance of block copolymer devices is independent of the crystalline texture in the active layer},
author = {Guo, Changhe and Lee, Youngmin and Lin, Yen -Hao and Strzalka, Joseph and Wang, Cheng and Hexemer, Alexander and Jaye, Cherno and Fischer, Daniel A. and Verduzco, Rafael and Wang, Qing and Gomez, Enrique D.},
abstractNote = {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. That is, the dominant crystal orientation, whether face-on or edge-on, is not critical to organic solar cells. Furthermore, a broad distribution of crystallite orientations ensures pathways for charge transport in any direction and enables efficient charge extraction in photovoltaic devices.},
doi = {10.1021/acs.macromol.6b00370},
journal = {Macromolecules},
number = 12,
volume = 49,
place = {United States},
year = {2016},
month = {6}
}