TY - JOUR
T1 - The phase behavior of a polymer-fullerene bulk heterojunction system that contains bimolecular crystals
AU - Miller, Nichole Cates
AU - Gysel, Roman
AU - Miller, Chad E.
AU - Verploegen, Eric
AU - Beiley, Zach
AU - Heeney, Martin
AU - McCulloch, Iain
AU - Bao, Zhenan
AU - Toney, Michael F.
AU - McGehee, Michael D.
N1 - Generated from Scopus record by KAUST IRTS on 2023-02-14
PY - 2011/4/1
Y1 - 2011/4/1
N2 - Polymer:fullerene blends have been widely studied as an inexpensive alternative to traditional silicon solar cells. Some polymer:fullerene blends, such as blends of poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene (pBTTT) with phenyl-c71-butyric acid methyl ester (PC71BM), form bimolecular crystals due to fullerene intercalation between the polymer side chains. Here we present the determination of the eutectic pBTTT:PC 71BM phase diagram using differential scanning calorimetry (DSC) and two-dimensional grazing incidence X-ray scattering (2D GIXS) with in-situ thermal annealing. The phase diagram explains why the most efficient pBTTT:PC71BM solar cells have 75-80 wt % PC71BM since these blends lie in the center of the only room-temperature phase region containing both electron-conducting (PC71BM) and hole-conducting (bimolecular crystal) phases. We show that intercalation can be suppressed in 50:50 pBTTT:PC71BM blends by using rapid thermal annealing to heat the blends above the eutectic temperature, which forces PC71BM out of the bimolecular crystal, followed by quick cooling to kinetically trap the pure PC71BM phase. © 2011 Wiley Periodicals, Inc.
AB - Polymer:fullerene blends have been widely studied as an inexpensive alternative to traditional silicon solar cells. Some polymer:fullerene blends, such as blends of poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene (pBTTT) with phenyl-c71-butyric acid methyl ester (PC71BM), form bimolecular crystals due to fullerene intercalation between the polymer side chains. Here we present the determination of the eutectic pBTTT:PC 71BM phase diagram using differential scanning calorimetry (DSC) and two-dimensional grazing incidence X-ray scattering (2D GIXS) with in-situ thermal annealing. The phase diagram explains why the most efficient pBTTT:PC71BM solar cells have 75-80 wt % PC71BM since these blends lie in the center of the only room-temperature phase region containing both electron-conducting (PC71BM) and hole-conducting (bimolecular crystal) phases. We show that intercalation can be suppressed in 50:50 pBTTT:PC71BM blends by using rapid thermal annealing to heat the blends above the eutectic temperature, which forces PC71BM out of the bimolecular crystal, followed by quick cooling to kinetically trap the pure PC71BM phase. © 2011 Wiley Periodicals, Inc.
UR - https://onlinelibrary.wiley.com/doi/10.1002/polb.22214
UR - http://www.scopus.com/inward/record.url?scp=79952170977&partnerID=8YFLogxK
U2 - 10.1002/polb.22214
DO - 10.1002/polb.22214
M3 - Article
SN - 0887-6266
VL - 49
SP - 499
EP - 503
JO - Journal of Polymer Science, Part B: Polymer Physics
JF - Journal of Polymer Science, Part B: Polymer Physics
IS - 7
ER -