Carrier Generation Engineering toward 18% Efficiency Organic Solar Cells by Controlling Film MicrostructureShow others and affiliations
2022 (English)In: Advanced Energy Materials, ISSN 1614-6832, E-ISSN 1614-6840, Vol. 12, no 19, article id 2103940Article in journal (Refereed) Published
Abstract [en]
The single bulk-heterojunction active layer based on non-fullerene acceptors (NFAs) has dominated the power conversional efficiencies above 18% in state-of-the-art organic solar cells (OSCs). However, a deep understanding of the relationship between charge carrier process and film microstructure remains unclear for emerging NFA OSCs. Herein, with the superstar PM6:Y6 blend as a model, the charge generation process in active layers is successfully manipulated by designing three different film microstructures, and they are correlated with the final photovoltaic performance in OSC devices. The amount of intermediate intra-moiety excited states from the nanoscale Y6 aggregates can be effectively enhanced by controlling the phase separation domains and film crystallinity in the bicontinuous PM6:Y6 networks. This robustly improves the hole transfer, and thus promotes charge generation. As a result, the optimal films show superior device performance, that is, the high efficiencies of 16.53% and 17.98% for PM6:Y6- and D18:Y6-based single junction OSCs, respectively. The results presented here give a rational guide for optimizing the charge carrier process through controlling morphological microstructures toward high-performance NFA OSCs.
Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2022. Vol. 12, no 19, article id 2103940
Keywords [en]
aggregates; charge generation; film microstructure; non-fullerene acceptors; organic solar cells; photovoltaic performance
National Category
Other Chemistry Topics
Identifiers
URN: urn:nbn:se:liu:diva-184507DOI: 10.1002/aenm.202103940ISI: 000778944400001OAI: oai:DiVA.org:liu-184507DiVA, id: diva2:1654251
Note
Funding Agencies|National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51873204, 51933010, 11875316, U1832146]; 111 ProjectMinistry of Education, China - 111 Project [B21005]; National 1000-talent-plan program [1110010341]; Science and Technology Program of Shaanxi Province [2021KJXX-13]; Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities [GK202103104]; Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
2022-04-262022-04-262024-01-10Bibliographically approved