Title :
Traps, morphology and degradation in high efficiency polymer solar cells
Author :
Beiley, Zach M. ; Peters, Craig H. ; Sachs-Quitana, I.T. ; Hoke, Eric T. ; Burkhard, George F. ; McGehee, Michael D.
Author_Institution :
Mater. Sci. & Eng., Stanford Univ., Stanford, CA, USA
Abstract :
Bulk heterojunction solar cells (BHJs) based on poly[N-9"-hepta-decanyl-2,7-carbazole-alt-5,5-(4\´,7\´-di-2-thienyl-2\´,1\´,3\´-benzothiadiazole)] (PCDTBT) can have internal quantum efficiencies approaching 100% but require active layers that are too thin to absorb more than ~70% of the above bandgap light.[1] In this work, we demonstrate that PCDTBT films contain a high density of hole-traps, which correlate with polymer morphology and are important for BHJ performance.
Keywords :
hole traps; solar cells; 2,7-carbazole-alt-5,5-4\´,7\´-di-2-thienyl-2\´,1\´,3\´-benzothiadiazole; BHJ performance; PCDTBT films; active layers; bulk heterojunction solar cells; high efficiency polymer solar cells; hole-traps; internal quantum efficiencies; poly-N-9"-hepta-decanyl; polymer morphology; Films; Morphology; Photonic band gap; Photovoltaic cells; Polymers; Temperature;
Conference_Titel :
Photovoltaic Specialists Conference (PVSC), 2011 37th IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-9966-3
DOI :
10.1109/PVSC.2011.6185950
