Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202108797
Keywords
interdigitated heterojunctions; morphology; nanopores; polymer solar cells; sequential deposition
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21825502, 22075190, 21905185]
- Special funds for local science and technology development guided by the Central Government [2020ZYD004]
- Foundation of State Key Laboratory of Polymer Materials Engineering [SKLPME 2017-2-04]
- Fundamental Research Funds for the Central Universities [YJ201957]
- U.S. DOE Office of Science Facility, at Brookhaven National Laboratory [DE-SC0012704]
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By utilizing a sequential solution processing method, a more suitable IHJ nanostructure for organic solar cells has been achieved, leading to an increased power conversion efficiency. The IHJ structure, compared to the BHJ structure, can efficiently dissociate excitons, reduce charge recombination, and facilitate the transport of free electrons and holes through more straightforward pathways, ultimately enhancing performance.
The most popular approach to fabricating organic solar cells (OSCs) is solution processing a mixture of donor (D) and acceptor (A) materials into an active layer with a bulk heterojunction (BHJ) nanostructure. Herein, it is demonstrated that the interdigitated heterojunction (IHJ) is a more suitable nanostructure of the active layer for high-performance OSCs whereas it is a long standing challenge to realize well-defined IHJ structures. In this study, a facile and versatile sequential solution processing method is developed to produce an IHJ nanostructure with power conversion efficiency reaching 18.74% (18.10% for BHJ the counterpart) by fabricating a donor film with nanopores created by a wax additive, sequentially casting the acceptor on top of infiltrating the nanopores. Compared to the BHJ, the IHJ structure with an interpillar distance within the exciton diffusion length can afford a large bulk D/A interface for efficient exciton dissociation with a minimized charge recombination while free electrons and holes can transport to the respective electrodes through more straightforward pathways, thus enhance performance. Furthermore, the D or A phase in the IHJ device contacts with only one electrode, which can prevent shunting between the anode and cathode and facilitate the industrial mass production of OSCs.
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