TY - GEN
T1 - The electron and energy transfer between oligothiophenes and thieno[3,4-b]thiophene units
AU - Szarko, Jodi
AU - Guo, Jianchang
AU - Liang, Yongye
AU - Rolczynski, Brian
AU - Yu, Luping
AU - Chen, Lin X
PY - 2008/11/21
Y1 - 2008/11/21
N2 - In a recent study, it has been shown that organic photovoltaic (OPV) solar cells consisting of polymers with certain stoichiometric ratios of alkyl thiophene:thieno[3,4-b]thiophene monomeric units in random sequences, when combined with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), may have potentials for creating more efficient devices. Such a potential enhancement is mainly due to the light harvesting in most of the visible and near infrared region by these low band-gap polymers. However, very little is known about the photoinduced energy/electron transfer and transport within these copolymers. It is important to understand both the ultrafast interactions between these two monomeric units when they are linked in the copolymers and their interactions with the electron acceptor PCBM in order to determine the transport mechanisms in these systems, and then to create the architectures that optimize electronic transport properties. Therefore, three oligomer molecules have been synthesized to model the local interactions in the copolymers, each of which consists of a thieno[3,4-b] thiophene derivative at its center linked with two alkyl oligothiophene side units. The alkyl oligothiophene units for the three molecules are 2, 4, or 8 units in length. By performing transient absorption and fluorescence upconversion measurements, the nature of the early exciton diffusion and energy transfer between these different units is elucidated.
AB - In a recent study, it has been shown that organic photovoltaic (OPV) solar cells consisting of polymers with certain stoichiometric ratios of alkyl thiophene:thieno[3,4-b]thiophene monomeric units in random sequences, when combined with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), may have potentials for creating more efficient devices. Such a potential enhancement is mainly due to the light harvesting in most of the visible and near infrared region by these low band-gap polymers. However, very little is known about the photoinduced energy/electron transfer and transport within these copolymers. It is important to understand both the ultrafast interactions between these two monomeric units when they are linked in the copolymers and their interactions with the electron acceptor PCBM in order to determine the transport mechanisms in these systems, and then to create the architectures that optimize electronic transport properties. Therefore, three oligomer molecules have been synthesized to model the local interactions in the copolymers, each of which consists of a thieno[3,4-b] thiophene derivative at its center linked with two alkyl oligothiophene side units. The alkyl oligothiophene units for the three molecules are 2, 4, or 8 units in length. By performing transient absorption and fluorescence upconversion measurements, the nature of the early exciton diffusion and energy transfer between these different units is elucidated.
KW - Fluorescence upconversion
KW - Oligothiophene
KW - Thienothiophene
KW - Transient absorption
UR - http://www.scopus.com/inward/record.url?scp=56249125303&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=56249125303&partnerID=8YFLogxK
U2 - 10.1117/12.797442
DO - 10.1117/12.797442
M3 - Conference contribution
AN - SCOPUS:56249125303
SN - 9780819472540
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Physical Chemistry of Interfaces and Nanomaterials VII
T2 - Physical Chemistry of Interfaces and Nanomaterials VII
Y2 - 11 August 2008 through 12 August 2008
ER -
