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Proceedings Paper

Bridge effects on light harvesting of a DBfA type polymer system
Author(s): Sam-Shajing Sun; Muhammad Hasib; Alexander V. Gavrilenko; Joshua Devan; Vladimir Gavrilenko
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Paper Abstract

Plastic optoelectronic materials and thin film devices are very attractive in future optical sensor and solar energy applications due to their lightweight, flexible shape, high photon absorption coefficients, low cost, and environmental benefits. In this study, optoelectronic properties of D, D/fA blend, DfA, and a series of DBfA type of conjugated block copolymers has been investigated, where D is a donor type PPV conjugated block, B is a non-conjugated and flexible aliphatic hydrocarbon bridge chain containing different number of aliphatic methylene units, and fA is a fluorinated acceptor type PPV conjugated block. The optical absorptions of the D/fA blend, DfA, and DBfAs are typical overlaps of individual absorptions of D and fA blocks, while the solution steady state photoluminescence (PL) emission of D were quenched to different levels in blends and block copolymers, with DBfAs containing one methylene unit bridge (DB1fA) quenched most. This could be attributed to an intra-molecular photo induced electron transfer or charge separation in DBfA systems. Theoretical first principles study of the equilibrium atomic configuration of DfA reveals the existence of twisting angles between the D and fA blocks in DfA stable states which may account for a less PL quenching of DfA as compared to DB1fA. These results are important for designing and developing high efficiency polymer based optoelectronic systems.

Paper Details

Date Published: 26 September 2016
PDF: 9 pages
Proc. SPIE 9942, Organic Photovoltaics XVII, 99421E (26 September 2016); doi: 10.1117/12.2239027
Show Author Affiliations
Sam-Shajing Sun, Norfolk State Univ. (United States)
Muhammad Hasib, Norfolk State Univ. (United States)
Alexander V. Gavrilenko, Vlexco LLC (United States)
Joshua Devan, Vlexco LLC (United States)
Vladimir Gavrilenko, Vlexco LLC (United States)

Published in SPIE Proceedings Vol. 9942:
Organic Photovoltaics XVII
Zakya H. Kafafi; Paul A. Lane; Ifor D. W. Samuel, Editor(s)

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