Absolute Measurement of Domain Composition and Nanoscale Size Distribution Explains Performance in PTB7:PC 71 BM Solar Cells
North Carolina State University · University of Cambridge · +1 more institution
Abstract
Abstract The importance of morphology to organic solar cell performance is well known, but to date, the lack of quantitative, nanoscale and statistical morphological information has hindered obtaining direct links to device function. Here resonant X‐ray scattering and microscopy are combined to quantitatively measure the nanoscale domain size, distribution and composition in high efficiency solar cells based on PTB7 and PC 71 BM. The results show that the solvent additive diiodooctane dramatically shrinks the domain size of pure fullerene agglomerates that are embedded in a polymer‐rich 70/30 wt.% molecularly mixed matrix, while preserving the domain composition relative to additive‐free devices. The…
Citation impact
- FWCI
- 52.95
- Percentile
- 100%
- References
- 43
Authors
6Topics & keywords
- Materials science
- Fullerene
- Organic solar cell
- Nanoscopic scale
- Miscibility
- Polymer solar cell
- Polymer
- Dispersion (optics)