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Title: The effect of confinement on the crystalline microstructure of polymer: fullerene bulk heterojunctions

We investigate the effect of confinement on the coherence length and the crystalline microstructure of the polymer component of polymer: fullerene bulk heterojunction thin films using grazing incidence wide angle x-ray scattering. We find that the polymer crystallite size decreases and the alignment of the molecules along the surface normal increases, as the thin-film thickness is reduced from 920nm to < 20nm and approaches the thin-film confinement regime. Furthermore, we find that the polymer crystallite size near the surface (air interface) is lower than the crystallite size in the bulk or the bottom (substrate interface) of bulk heterojunction films thicker than the confinement regime. Variation in polymer crystallite size can cause changes in charge carrier mobility and recombination rates, which in turn affect the performance of bulk heterojunction thin film devices such as photovoltaics and photodetectors
Authors:
 [1] ;  [2] ;  [3]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Sustainable Energy Technologies Department; Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Sustainable Energy Technologies Department
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Sustainable Energy Technologies Department; Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy; Stony Brook Univ., NY (United States). Department of Electrical and Computer Engineering
Publication Date:
OSTI Identifier:
1240586
Report Number(s):
BNL--108205-2015-JA
Journal ID: ISSN 1463-9076; PPCPFQ; YN0100000
Grant/Contract Number:
SC00112704; AC02-98CH10886
Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP (Print)
Additional Journal Information:
Journal Name: Physical Chemistry Chemical Physics. PCCP (Print); Journal Volume: 17; Journal Issue: 36; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY