TY - JOUR
T1 - High-Crystallinity π-Conjugated Small Molecules Based on Thienylene-Vinylene-Thienylene
T2 - Critical Role of Self-Organization in Photovoltaic, Charge-Transport, and Morphological Properties
AU - Furukawa, Seiichi
AU - Komiyama, Hideaki
AU - Aizawa, Naoya
AU - Yasuda, Takuma
N1 - Funding Information:
This work was supported in part by a Grant-in-Aid for JSPS KAKENHI Grant No. JP18H02048 (T.Y.). The GIXD measurements were performed at the BL-40B2 beamline of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2016B1118 and 2017A1119).
Funding Information:
This work was supported in part by a Grant-in-Aid for JSPS KAKENHI Grant No. JP18H02048 (T.Y.). The GIXD measurements were performed at the BL-40B2 beamline of SPring-8, with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2016B1118 and 2017A1119). The computations were primarily performed using the computer facilities at the Research Institute for Information Technology, Kyushu University. The authors are grateful to the support of the Cooperative Research Program “Network Joint Research Center for Materials and Devices”. S.F. acknowledges the support from the Leading Graduate Schools Program of “Advanced Graduate Course on Molecular Systems for Devices” by MEXT, Japan.
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/12/12
Y1 - 2018/12/12
N2 - Narrow-band-gap small molecules with π-extended backbones are promising donor materials for solution-processed bulk-heterojunction (BHJ) organic solar cells (OSCs). Herein, a series of acceptor-donor-acceptor (A-D-A) photovoltaic small molecules incorporating thienylene-vinylene-thienylene (TVT) as a central D unit and alkyl-substituted rhodanine or 2-(1,1-dicyanomethylene)rhodanine as terminal A units are designed and synthesized. Their physical properties including photoabsorption, electronic energy levels, hole mobility, and morphological characteristics are systematically investigated. Using solvent vapor annealing (SVA), the morphologies of the BHJ photoactive layers composed of these small-molecule donors and a [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM) acceptor can be properly modulated. As a result of increased crystallinity of the donors and desired phase segregation between the donors and PC 71 BM upon rapid SVA treatment, the photovoltaic performances of the resultant OSC devices undergo drastic enhancement. The results reported here indicate that high-efficiency small-molecule OSCs can be achieved through rational design of the TVT-based molecular framework and optimization of the nanoscale phase-segregated morphology via proper SVA treatment.
AB - Narrow-band-gap small molecules with π-extended backbones are promising donor materials for solution-processed bulk-heterojunction (BHJ) organic solar cells (OSCs). Herein, a series of acceptor-donor-acceptor (A-D-A) photovoltaic small molecules incorporating thienylene-vinylene-thienylene (TVT) as a central D unit and alkyl-substituted rhodanine or 2-(1,1-dicyanomethylene)rhodanine as terminal A units are designed and synthesized. Their physical properties including photoabsorption, electronic energy levels, hole mobility, and morphological characteristics are systematically investigated. Using solvent vapor annealing (SVA), the morphologies of the BHJ photoactive layers composed of these small-molecule donors and a [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM) acceptor can be properly modulated. As a result of increased crystallinity of the donors and desired phase segregation between the donors and PC 71 BM upon rapid SVA treatment, the photovoltaic performances of the resultant OSC devices undergo drastic enhancement. The results reported here indicate that high-efficiency small-molecule OSCs can be achieved through rational design of the TVT-based molecular framework and optimization of the nanoscale phase-segregated morphology via proper SVA treatment.
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U2 - 10.1021/acsami.8b17056
DO - 10.1021/acsami.8b17056
M3 - Article
C2 - 30450903
AN - SCOPUS:85058134045
SN - 1944-8244
VL - 10
SP - 42756
EP - 42765
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 49
ER -
