Abstract
Exciton diffusion and photoluminescence quenching in conjugated polymer/fullerene heterostructures are studied by time-resolved photoluminescence. It is observed that heterostructures consisting of a spin-coated poly(p-phenylene vinylene) (PPV)-based derivative and evaporated C-60 are ill-defined because of diffusion of C60 into the polymer, leading to an overestimation of the exciton diffusion length. This artifact is resolved by the use of a novel, thermally side-chain polymerizing and cross-linking fullerene derivative (F2D) containing two diacetylene moieties, forming a completely immobilized electron acceptor layer. With this heterostructure test system, an exciton diffusion length of 5 +/- 1 nm is derived for this PPV derivative from time-integrated luminescence quenching data.
Original language | English |
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Pages (from-to) | 5266-5274 |
Number of pages | 9 |
Journal | The Journal of Physical Chemistry A |
Volume | 109 |
Issue number | 24 |
DOIs | |
Publication status | Published - 23-Jun-2005 |
Keywords
- PHOTOINDUCED ELECTRON-TRANSFER
- PLASTIC SOLAR-CELLS
- PHOTOVOLTAIC CELLS
- HETEROJUNCTION
- BUCKMINSTERFULLERENE
- DISSOCIATION
- EFFICIENT
- C-60
- LUMINESCENCE
- BLENDS