Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 26, Pages 13049-13058Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta04941g
Keywords
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Funding
- National Natural Science Foundation of China [51763017, 21602150]
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2018R1A2A1A05077194]
- Center for Advanced Soft-Electronics - Ministry of Science and ICT as a Global Frontier Project [2012M3A6A5055225]
- Wearable Platform Materials Technology Center (WMC) - Korean Government (MSIT) [2016R1A5A1009926]
- UNIST (Ulsan National Institute of Science Technology) [1.200042, 1.200030]
- National Research Foundation of Korea [2018R1A2A1A05077194, 미래선도형특성화연구, 2016R1A5A1009926] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Controlling the morphological stability of non-fullerene polymer solar cells (NF-PSCs) is a critical process for improving photovoltaic performances. In many systems, liquid additives have been widely used to produce favorable morphological features; however, liquid additives frequently leave residues after thermal treatment owing to their high boiling points, which has detrimental effects on the reproducibility of NF-PSCs. In this study, commercially available and volatilizable solid additives, 9,10-anthracenedione (BDT-1) and benzo[1,2-b:4,5-b ']dithiophene-4,8-dione (BDT-2), are selected to coordinate the molecular arrangement to enhance absorption intensity, charge transfer, and molecular crystallinity. Suppressed bimolecular recombination and a favorable balance between the domain size and relative domain purity were observed with the introduction of both solid additives, which improved the photovoltaic parameters of NF-PSCs. PM6:TPT10-based devices with BDT-1 and BDT-2 additives achieved the best power conversion efficiencies (PCEs) of 16.26% and 15.18%, respectively, which were better than the 13.55% achieved with a 1,8-diiodooctane (DIO) additive. Other NF-PSC systems of PBDB-T:TPT10 and PTQ10:TPT10 blends also showed that the photovoltaic performance with the solid additives is superior to that with liquid additives. These results imply that the use of solid additives is a promising strategy to improve the PCEs of NF-PSCs.
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