Abstract
The impact of thermal annealing on charge transfer (CT) states in poly[N-9″-hepta-decanyl-2,7-carbazole- alt -5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT):[6,6]-phenyl C71 butyric acid methyl ester (PC70BM) bulk heterojunction solar cells is analyzed. Thermal annealing is found to increase the effectiveness of the CT states, facilitating exciton dissociation and carrier generation. An increase in the concentration of deep traps due to annealing is presented using mid-gap photothermal deflection spectroscopy, resulting in suboptimal overall device performance.
Original language | English |
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Article number | 1500167 |
Journal | Advanced Electronic Materials |
Volume | 1 |
Issue number | 9 |
Early online date | 8 Jul 2015 |
DOIs | |
Publication status | Published - Sept 2015 |
Scopus Subject Areas
- Electronic, Optical and Magnetic Materials
User-Defined Keywords
- charge transfer states
- exciton dissociation
- organic solar cells
- photothermal deflection spectroscopy
- thermal annealing