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Correlation Between Crystallinity and Solar‐Cell Efficiency of the Low‐Bandgap Polymer PDDTP
Author(s) -
Renz Joachim A.,
Ashraf Raja Shahid,
Erb Tobias,
Shokhovets Sviatoslav,
Gobsch Gerhard,
Klemm Elisabeth,
Hoppe Harald
Publication year - 2010
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201000066
Subject(s) - crystallinity , polymer , materials science , annealing (glass) , crystallization , polymer solar cell , crystallization of polymers , band gap , energy conversion efficiency , chemical engineering , solar cell , fullerene , polymer chemistry , optoelectronics , composite material , chemistry , organic chemistry , engineering
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.