Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 32, Pages 29124-29131Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b10243
Keywords
organic solar cells; energy loss; device performance; nonfullerene acceptor; charge recombination
Funding
- National Natural Science Foundation of China [21805287, 91633301, 51673201, 21835006]
- Chinese Academy of Science [XDB12030200]
- Youth Innovation Promotion Association CAS [2018043]
- Beijing National Laboratory for Molecular Sciences [BNLMS-CXXM-201903]
- Ningbo Municipal Science and Technology Innovative Research Team [2015B11002, 2016B10005]
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The large energy loss (E-loss,) in organic solar cells (OSCs) relative to those of silicon or inorganic/organic hybrid perovskite solar cells is one of the major factors limiting the power conversion efficiency (PCE) of OSCs. Recently, OSCs based on nonfullerene acceptors (NFAs) have achieved high PCEs at decreased E-loss values. Therefore, the present study investigates the relationship between E-loss, and the device performance of NFA-based OSCs. Here, we select two polymer donors (PBDB-T and its fluorinated derivative PBDB-TF) and blend each polymer donor with each of three NFAs (indaceno[1,2-b:5,6-b']dithiophene and 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (IEIC) and its respective fluorinated and chlorinated derivatives IE-4F and IE-4Cl), which provide varied energy-level alignments. The six blends exhibit similar morphologies and charge transport properties but varied E-loss values in OSCs. The results indicate that the charge generation and PCE of the OSCs increase with the increasing E-loss. Accordingly, the PBDB-T:IE-4Cl-based device yields the highest PCE of 11.1% with an E-loss, of 0.64 eV, while the PBDB-TF:IEIC-based device provides a significantly decreased PCE of 3.8% with a diminished E-loss of 0.52 eV. These results demonstrate the great importance of finely tuning the energy-level alignments of these types of donor/acceptor systems to achieve the best device performance.
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