Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202100492
Keywords
hole transport layers; interfacial engineering; organic solar cells; power conversion efficiency
Categories
Funding
- Natural Science Foundation of China [51973063]
- Basic and Applied Basic Research Major Program of Guangdong Province [2019B030302007]
- National Key Research and Development Program of China - Ministry of Science and Technology of the People's Republic of China [2019YFA0705900]
- Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials [2019B121205002]
- Shen Zhen Technology and Innovation Commission [JCYJ20170413173814007, JCYJ20170818113905024]
- Hong Kong Research Grants Council [R6021-18, C6023-19G, 16309218, 16310019, 16303917]
- Hong Kong Innovation and Technology Commission [ITC-CNERC14SC01, ITS/471/18]
- National Natural Science Foundation of China (NSFC) [91433202, 21835006, 51673201, 51961165102, 51961135103]
- Hong Kong Ph.D. Fellowship Scheme [PF17-03929]
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Anode modification is crucial for enhancing the performance of organic solar cells (OSCs), with various doped hole transport layers (HTLs) showing improved work functions and conductivities. The study demonstrates that different adulterants formed varying hydrogen bonds in HTLs, resulting in different interfacial morphology and mobility, affecting recombination differently. The doping strategy extends to a high-performance system, achieving a significant efficiency increase in all-polymer solar cells.
Anode modification is vital for improving device performance of organic solar cells (OSCs). PEDOT:PSS is the most widely applied hole transport layer (HTL) in OSCs. In this work, three kinds of modified HTLs, namely PEDOT:PSS-PA, PEDOT:PSS-TA, and PEDOT:PSS-DA are readily prepared via simple doping of phenylethylamine derivatives into commercially available Al 4083, by modulating the number of hydroxyl groups on the adulterant molecules. All of them exhibit enhanced work functions (WFs) and conductivities. Matching with PM6:Y6 composed active layers, PEDOT:PSS-TA based devices achieves the highest performance with a power conversion efficiency (PCE) of 17.10%, while the PM6:ITC-2Cl system demonstrates a highest PCE of 14.17% in devices with PEDOT:PSS-DA, and the optimal PCE of PM6:PIDTC-T based OSCs is equal to 9.55% while the HTL is PEDOT:PSS-PA. Further investigations reveal that the different adulterants formed various amount of hydrogen bonds in HTLs, inducing dissimilar interfacial morphology and mobility, and thus unidentical degrees of change in recombination. Afterwards, the doping strategy is extended to a newly proposed high-performance system PM6:PY-IT, and successfully drags its efficiency from 14.78% to 15.62%, another world-class breakthrough for all-polymer solar cells. In summary, this study not only achieves a series of OSCs with improved PCEs, but also delivers a deep understanding of PEDOT:PSS improvement.
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