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Thermal-annealing dependence of crystallization on solution-processed small-molecule organic photovoltaics.
- Source :
- Physica Status Solidi. A: Applications & Materials Science; Feb2016, Vol. 213 Issue 2, p412-418, 7p
- Publication Year :
- 2016
-
Abstract
- For solution-based small-molecule organic photovoltaic cells (SM BHJ), thermal annealing is often regarded as a very vital processing to yield high-efficiency devices. Here, the device with the photoactive p-DTS(FBTTh<subscript>2</subscript>)<subscript>2</subscript>:PC<subscript>60</subscript>BM blends has been studied by varying the annealing temperature. The highest power conversion efficiency (PCE), fill factor (FF), and short-circuit current ( J<subscript>sc</subscript>) has been achieved after the device was annealed at the temperature of 80 °C. X-ray diffraction (XRD) displayed that the p-DTS(FBTTh<subscript>2</subscript>)<subscript>2</subscript> tends to form big islands with well-defined crystalline structure (long coherence length) surrounded by small islands of the PC<subscript>60</subscript>BM after annealing, and reached the largest grain size of 27 nm after annealing at 80 °C. AFM images demonstrated the most sufficient phase separation within the photoactive blend layer after annealing at 80 °C, which provides good photogenerated excitons dissociation. Such improvements have proved beneficial to decrease the ohmic loss and recombination in carrier-transport process via measuring series resistance and shunt resistance as well as hole mobility. This work opens up a new way to understand the relationship between thermal annealing and molecular interaction from the viewpoint of lattice relaxation. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18626300
- Volume :
- 213
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Physica Status Solidi. A: Applications & Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 112925629
- Full Text :
- https://doi.org/10.1002/pssa.201532617