Journal
NPJ FLEXIBLE ELECTRONICS
Volume 1, Issue 1, Pages -Publisher
SPRINGERNATURE
DOI: 10.1038/s41528-017-0011-z
Keywords
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Funding
- German Federal Ministry of Education and Research (BMBF) [03EK3501H]
- BMBF [03EK3504]
- Center for Functional Nanostructures (CFN)
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Ternary absorber blends have recently been identified as promising concepts to spectrally broaden the absorption of organic bulk-heterojunction solar cells and hence to improve their power conversion efficiencies. In this work, we demonstrate that D-D-A ternary blends comprising two donor polymers and the acceptor PC61BM can also significantly enhance the thermal stability of the solar cell. Upon harsh thermal stress at 120 degrees C for 2 h, the ternary solar cells show only a minor relative deterioration of 10%. Whereas the polymer/fullerene blend PTB7-Th:PC61BM is rather unstable under these conditions, its degradation was efficiently suppressed by incorporating the near infrared-absorbing polymer PDTP-DFBT. Spectroscopic ellipsometry investigations and an effective medium analysis of the ternary absorber blend revealed that the domain conformation in presence of PDTP-DFBT remains stable whereas the domain conformation changes in its absence. The ternary PTB7-Th:PDTP-DFBT:PC61BM solar cells yield thermally stable power conversion efficiencies of up to 6%.
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