Enhancement of the Morphology and Open Circuit Voltage in Bilayer Polymer/Fullerene Solar Cells

We describe the influence of thermal annealing on the performance of polymer bilayer solar cell devices of regioregular poly(3-hexylthiophene), regiorandom poly(3-hexylthiophene), or poly(3-hexyl-2,5-thienylene vinylene) (P3HTV), with C60 as the electron acceptor. In all cases, charge collection imp...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2009-07, Vol.113 (26), p.11408-11415
Main Authors: Stevens, Derek M, Qin, Yang, Hillmyer, Marc A, Frisbie, C. Daniel
Format: Article
Language:English
Subjects:
C: Energy Conversion and Storage
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Summary:We describe the influence of thermal annealing on the performance of polymer bilayer solar cell devices of regioregular poly(3-hexylthiophene), regiorandom poly(3-hexylthiophene), or poly(3-hexyl-2,5-thienylene vinylene) (P3HTV), with C60 as the electron acceptor. In all cases, charge collection improves with heat treatment as the donor/acceptor layers intermix. Open circuit voltage, V oc, also improves with annealing temperature, trending consistently with a reduction in the dark forward current. With extreme temperatures, C60 completely penetrates the polymer film, causing a reduction in V oc. This C60 penetration in annealed devices can be prevented by inclusion of a pentacene electron-blocking layer at the anode. For P3HTV/C60 solar cells, these treatments lead to peak power conversion efficiencies of 1.19%.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp902198y