Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 33, Pages 29765-29772Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b07067
Keywords
fused perylene diimide; built-in twisting configuration; compatibility; polymer electron acceptor; power conversion efficiency
Funding
- National Natural Science Foundation of China [21644006, 51403044]
- Natural Science Foundation of Heilongjiang Province of China [E2018036]
- Fundamental Research Funds for the Central Universities (Harbin Institute of Technology)
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A novel fused perylene diimide (PDI)-based polymer electron acceptor (PFPDI-BDF) with a built-in twisting configuration was constructed for application in all-polymer solar cells (all-PSCs). To shed light on the compatibility of the FPDI polymer acceptor and to identify a suitable polymer donor for device applications, we considered herein to investigate three polymer donors (PBDB-T, PTB7-Th, and PCPDTFBT) with different optical and electronic properties as well as polymer chain packing behavior for comparing the device performance. After being fabricated with PFPDI-BDF, polymer donor PBDB-T with a wide band gap showed a decent power conversion efficiency (PCE) of 4.86% with an open-circuit voltage (V-oc) of 0.82 V, a short-circuit current density (J(sc)) of 8.94 mA cm(-2), and a recorded fill factor (FF) of 66.3%, which is one of the best FF reported for PDI-based all-polymer solar cells (all-PSCs). The enhanced efficiency of 6.05% was found in the medium band gap polymer PTB7-Th devices due to the more complementary absorption region that makes the photoactive blends absorb more photons, giving rise to an increased J(sc) of 12.97 mA cm(-2). On the other hand, due to the inferior exciton dissociation/extraction efficiency and unfavorable morphology compatibility, the narrow band gap polymer donor PCPDTFBT/PFPDI-BDF devices exhibited the worst PCE of only 0.71% with a low J(sc) of 2.2 mA cm(-2) and a FF of 42.4%.
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