Abstract
Non-radiative voltage loss is one of the significant bottlenecks limiting the performance of organic solar cells (OSCs). This work presents a material design approach for conjugated polymers isolating the polymer chains with molecular encapsulation, enabling better control over the donor-acceptor spacing. Bulk-heterojunction OSCs based on encapsulated polymers as electron donors show a remarkable increase of ∼50 mV in the Voc. Significant improvement in the Voc is attributed to reduced non-radiative voltage losses as evidenced by enhanced electroluminescence as a result of suppressed intermolecular aggregation and an increase in structural disorder. Importantly, molecular encapsulation resulted in notable improvement in the operational stability of OSCs with no burn-in loss in Voc, presenting a promising strategy to simultaneously enhance the performance and operational stability of OSCs.
Original language | English (US) |
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Pages (from-to) | 735-744 |
Number of pages | 10 |
Journal | Materials Chemistry Frontiers |
Volume | 7 |
Issue number | 4 |
DOIs | |
State | Published - Jan 3 2023 |
ASJC Scopus subject areas
- General Materials Science
- Materials Chemistry