Journal
SOLAR RRL
Volume 6, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202200496
Keywords
layer-by-layer fabrication; low energy losses; organic solar cells; quaternary active layers
Funding
- National Key Research and Development Program of China [2019YFA0705900]
- MOST
- NSFC [51820105003, 52103243]
- Basic and Applied Basic Research Major Program of Guangdong Province [2019B030302007]
- Office of Naval Research [N00014-19-1-2453]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
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This study demonstrates a new device fabrication strategy for organic solar cells (OSCs) by combining the layer-by-layer (LBL) method and a quaternary active layer. Highly efficient photovoltaic performance of the OSCs based on PM6:PM7/Y6:O1-2F is achieved. The introduction of the second donor and second acceptor improves charge transfer and optimizes the morphology of the active layer. The results show that quaternary LBL OSCs have great potential for large-scale and industrial manufacture of OSCs.
How to improve charge transport properties and reduce energy losses are the two main challenges of organic solar cells (OSCs). Herein, a new device fabrication strategy that combines the layer-by-layer (LBL) method and a quaternary active layer is demonstrated to realize highly efficient photovoltaic performance of the OSCs based on PM6:PM7/Y6:O1-2F. The introduction of the second donor, PM7, forms a cascade energy-level alignment with PM6 that facilitates effective charge transfer. The second acceptor, O1-2F, which is poorly miscible with the donors, helps to reduce the miscibility between the donors and acceptors, and thus delivers a more desirable vertical phase separation of the active layer. Furthermore, the alloy acceptor of O1-2F and Y6 can optimize the horizontal and vertical morphology of the active layer, forming an effective charge separation and continuous charge transport channel. As a result, the PM6:PM7/Y6:O1-2F system shows a distinct increase in charge mobility and a reduced nonradiative loss Delta V-nr of 0.231 V compared to the PM6/Y6 system, achieving a high-power conversion efficiency of 18.23%. The results indicate that the quaternary LBL OSCs are promising for future large-scale and industrial manufacture of the OSCs.
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