TY - JOUR
T1 - Ultrafast Exciton-to-Polaron Conversion in Densely Packed Small Organic Semiconducting Molecules
AU - Kozlov, Oleg V.
AU - Luponosov, Yuriy N.
AU - Solodukhin, Alexander N.
AU - Flament, Bruno
AU - Olivier, Yoann
AU - Lazzaroni, Roberto
AU - Cornil, Jérôme
AU - Ponomarenko, Sergei A.
AU - Pshenichnikov, Maxim S.
N1 - Funding Information:
O.V.K. acknowledges Aurora—Toward Modern and Innovative Higher Education program for financial support. Studies on conjugated materials in Mons are supported by the Science Policy Office of the Belgian Government (BELSPO; PAI 7/5) and FNRS-FRFC. J.C. is FNRS research director. Y.N.L., A.N.S., and S.A.P. thank Russian Science Foundation (Grant No. 14-13-01380) for financial support of the synthesis of the star-shaped molecules.
Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2017/4/3
Y1 - 2017/4/3
N2 - In the rapidly developing field of organic photovoltaics, the material design and device engineering are key factors that eventually determine the device efficiency. Design of the active layer material and intermolecular interactions largely determine the efficiency of organic solar cells. In this study, the authors discuss ultrafast photophysics of four star-shaped molecules (SSMs) as benchmark materials with time-resolved photoinduced absorption and photoluminescence spectroscopy as experimental tools. The authors show that efficient exciton-to-charge conversion occurs in SSM films even without an external acceptor. This results in the lowering of the Coulomb binding between intermolecular electron–hole polaron pairs which, in turn, can lead to an increased open-circuit voltage. The findings suggest that promoting intermolecular interactions in films of small organic molecules is one of the pathways to highly efficient organic solar cells.
AB - In the rapidly developing field of organic photovoltaics, the material design and device engineering are key factors that eventually determine the device efficiency. Design of the active layer material and intermolecular interactions largely determine the efficiency of organic solar cells. In this study, the authors discuss ultrafast photophysics of four star-shaped molecules (SSMs) as benchmark materials with time-resolved photoinduced absorption and photoluminescence spectroscopy as experimental tools. The authors show that efficient exciton-to-charge conversion occurs in SSM films even without an external acceptor. This results in the lowering of the Coulomb binding between intermolecular electron–hole polaron pairs which, in turn, can lead to an increased open-circuit voltage. The findings suggest that promoting intermolecular interactions in films of small organic molecules is one of the pathways to highly efficient organic solar cells.
KW - charge separation
KW - donor–acceptor oligomers
KW - organic solar cells
KW - photoluminescence
KW - pump-probe spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85014622139&partnerID=8YFLogxK
U2 - 10.1002/adom.201700024
DO - 10.1002/adom.201700024
M3 - Article
AN - SCOPUS:85014622139
SN - 2195-1071
VL - 5
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 7
M1 - 1700024
ER -