Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 5, Pages 4895-4903Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b17969
Keywords
EEL; polymer solar cells; bilayer; ZnO; C-QDs
Funding
- National Natural Science Foundation of China (NSFC) [61704118, 51602212, 61605137]
- Shanxi Provincial Natural Science Foundation of China [201601D021050]
- Qualified Personal Foundation of Taiyuan University of Technology [800101-02030017]
- Research Grants Council of Hong Kong Special Administrative Region, China [12303114, 12302817]
- Hong Kong Baptist University Inter-Institutional Collaborative Research Scheme [RC-ICRS/15-16/04]
- Shenzhen Peacock Plan [KQTD20140630110339343]
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In this work, we report the effort to develop high-efficiency inverted polymer solar cells (PSCs) by applying a solution-processable bilayer ZnO/carbon quantum dots (C-QDs) electron extraction layer (EEL). It is shown that the use of the bilayer EEL helps to suppress the exciton quenching by passivating the ZnO surface defects in the EEL, leading to an enhanced exciton dissociation, reduced charge recombination and more efficient charge extraction probability, and thereby achieving high power conversion efficiency (PCE). The inverted PSCs, based on the blend of poly{4,8-bis[(2-ethylhexyl)oxy]benzo [1,2-b:4,5-b'], dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl) carbonyl] thieno [3,4-b] thiophene-4,6-diyl} and [6,6]-phenyl C71-butyric acid methyl ester, possess a significant improvement in PCE of similar to 9.64%, which is >27% higher than that of a control cell (similar to 7.59%). The use of a bilayer ZnO/C-QD EEL offers a promising approach for attaining high-efficiency inverted PSCs.
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