Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 7, Pages 7216-7225Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b20917
Keywords
photovoltaics; bulk heterojunction solar cells; small molecule; porphyrin; D-A-D structure
Funding
- MINECO (Spain) [CTQ2016-79189-R]
- Junta de Comunidades de Castilla-la Mancha [SBPLY/17/180501/000254]
- FPU [FPU15/02170]
- Department of Science and Technology (Government of India) (DST/TMD/SERI/DOS)
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Two D-A-D small molecules with a DPP acceptor core and Zn-porphyrin donor with different electron-donating substituents, namely, 2,6-bis(dodecyloxy)phenyl and 5-hexylthieno[3,2-b]thiophen-2-yl at mesopositions, VC4 and VC5, were synthesized, and their optical and electrochemical properties were investigated. The results reveal that both molecules are suitable as donors for organic solar cells (OSCs) in which PC71BM is employed as the acceptor. Overall power conversion efficiencies of 8.05% (J(sc) = 13.83 mA/cm(2), V-oc = 0.91 V, and FF = 0.64) and 8.89% (J(sc) = 16.98 mA/cm(2), V-oc = 0.79 V, and FF = 0.663) were obtained, respectively. The high V-oc value for the VC4-based OSC correlates with the deeper HOMO, whereas the high J(sc) value for VC5 may be attributed to the extended absorption spectrum toward the longer wavelength region. Moreover, the relatively high FF value for VC5-based OSCs as compared to the VC4 counterparts may be related to the more balanced charge transport in the active layer, reduced charge recombination, and efficient charge collection. The energy loss for VC5 is smaller (0.52 eV) than that for VC4 (0.56 eV).
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