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Correlation Between Crystallinity and Solar-Cell Efficiency of the Low-Bandgap Polymer PDDTP

✍ Scribed by Joachim A. Renz; Raja Shahid Ashraf; Tobias Erb; Sviatoslav Shokhovets; Gerhard Gobsch; Elisabeth Klemm; Harald Hoppe

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
522 KB
Volume
211
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Polymer/fullerene bulk heterojunction solar cells consisting of PDDTP:PCBM blends have been investigated and optimized. The structural properties of the photoactive layers were studied by GID‐XRD, which revealed a pronounced response of photovoltaic parameters on the polymer crystallinity. In addition to P3HT, another donor polymer was found that develops crystalline domains upon annealing. We found a clear correlation between annealing time, power conversion efficiency, and polymer crystallinity. The PDDTP crystallization ability is a promising property. This is a first step toward the synthesis of low‐bandgap polymers, which likewise show the ability to form crystalline domains and may therefore lead to a substantial increase in efficiency.

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## Abstract New conjugated, alternating ter‐polyfluorene prepared by Suzuki reaction and a LUMO energy level of βˆ’3.3 eV, which is sufficient for electron transfer to the PCBM is presented. A solar cell power conversion efficiency of 0.8% is reached for the composition **P6**: **PCBM** 1:4. From opt