Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 12, Pages 12025-12036Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c02179
Keywords
ternary blend organic solar cells; non-fullerene acceptor; Forster resonance energy transfer; blend morphology; suppressed carrier recombination; composition-tolerant device performance
Funding
- EPSRC project Strategic University Network to Revolutionize Indian Solar Energy-SUNRISE [EP/P032591/1]
- IISc, Bangalore
- Royal Society Newton International Fellowship
- Department of Science and Technology, New Delhi
- Swiss National Science Foundation [P300P2_174471]
- Swiss National Science Foundation (SNF) [P300P2_174471] Funding Source: Swiss National Science Foundation (SNF)
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Organic solar cells (OSCs) fabricated from ternary blend thin film absorbers are designed to maximize the range of absorption in the solar spectrum and thus increase the short-circuit current density (J(SC)) of the device. Herein, we report OSCs formed with two different compositions of ternary blend thin films comprising two electron donors and one acceptor, namely, PTB7-Th/PCDTBT/IT4F and PTB7-Th/PBDB-T/IT4F. We evaluate the role of Forster resonance energy transfer (FRET) and blend morphology to achieve composition-dependent device performance. We observed >= 10% increment in J(SC) for both the ternary blends as compared to that for the PTB7-Th:IT4F binary blend, resulting in an enhanced power conversion efficiency (PCE) up to 10.34% for the PTB7-Th:PBDB-T:IT4F blend. We provide evidence that the two foremost parameters that control the PCE are blend morphology and FRET between donor components. The improved exciton generation rate for PCDTBT-based ternary blends was achieved, suggesting effective contribution of FRET toward enhanced device photocurrent, whereas the PBDB-T-based ternary blend excelled mainly due to suppressed carrier recombination as a result of favorable orientation with PTB7-Th/ IT4F.
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