Influence of Thermal Annealing on PCDTBT: PCBM Composition Profiles

被引：47
作者：
Synooka, Olesia [1 ,2 ]
Eberhardt, Kai-Rudi [1 ,2 ]
Singh, Chetan Raj [1 ,2 ]
Hermann, Felix [1 ,2 ]
Ecke, Gernot [3 ]
Ecker, Bernhard [4 ,5 ]
von Hauff, Elizabeth [4 ,5 ]
Gobsch, Gerhard [1 ,2 ]
Hoppe, Harald [1 ,2 ]
机构：
[1] TU Ilmenau, Inst Phys, Dept Expt Phys 1, D-98693 Ilmenau, Germany
[2] TU Ilmenau, Inst Mikro & Nanotechnol, D-98693 Ilmenau, Germany
[3] TU Ilmenau, Inst Mikro & Nanotechnol, Dept Nanotechnol, D-98693 Ilmenau, Germany
[4] Univ Freiburg, Inst Phys, Organ Photovolta & Elect Grp, D-79104 Freiburg, Germany
[5] Fraunhofer ISE, D-79110 Freiburg, Germany
来源：
ADVANCED ENERGY MATERIALS | 2014年 / 4卷 / 05期
关键词：
organic solar cells; sub-bandgap absorption; film composition; morphology; POLYMER SOLAR-CELLS; IMPEDANCE SPECTROSCOPY; THIN-FILMS; MORPHOLOGY; EFFICIENT; PERFORMANCE; POLY(3-HEXYLTHIOPHENE); RELAXATION; GENERATION; STABILITY;
D O I：
10.1002/aenm.201300981
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A variety of measurement techniques including photothermal deflection spectroscopy (PDS), auger electron spectroscopy (AES), (sub-bandgap) external quantum efficiency (EQE), and impedance spectroscopy are applied to poly[N-900-hepta-decanyl-2,7-carbazole-alt-5,5-(40,70-di-2-thienyl-20,10,30-benzothiadiazole (PCDTBT)/[6,6]-phenyl C-71 butyric acid methyl ester (PC71BM) films and devices to probe the stability under thermal annealing. Upon annealing, solar cell performance is drastically decreased for temperatures higher than 140 degrees C. Detailed investigation indicate changes in polymer:fullerene interactions resulting in the formation of a polymer wetting layer upon annealing at temperatures higher than 140 degrees C. Upon device completion this wetting layer is located close to the metal electrode and therefore leads to an increase in recombination and a decrease in charge carrier extraction, providing an explanation for the reduced fill factor (FF) and power conversion efficiency (PCE).
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页数：10
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