Journal
APPLIED PHYSICS LETTERS
Volume 109, Issue 2, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4958690
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Funding
- CSIR
- EPSRC [EP/M023532/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M023532/1] Funding Source: researchfish
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In this work, we report enhanced power conversion efficiency (PCE) of bulk heterojunction polymer solar cells by Forster resonance energy transfer (FRET) from samarium-doped luminescent gadolinium orthovanadate (GdVO4:Sm3+) quantum dots (QDs) to polythieno[3,4-b]-thiophene-co-benzodi-thiophene (PTB7) polymer. The photoluminescence emission spectrum of GdVO4:Sm3+ QDs overlaps with the absorption spectrum of PTB7, leading to FRET from GdVO4:Sm3+ to PTB7, and significant enhancements in the charge-carrier density of excited and polaronic states of PTB7 are observed. This was confirmed by means of femtosecond transient absorption spectroscopy. The FRET from GdVO4:Sm3+ QDs to PTB7 led to a remarkable increase in the power conversion efficiency (PCE) of PTB7:GdVO4:Sm3+:PC71BM ([6,6]-phenyl-C-71-butyric acid methyl ester) polymer solar cells. The PCE in optimized ternary blend PTB7:GdVO4:Sm3+: PC71BM (1:0.1:1.5) is increased to 8.8% from 7.2% in PTB7: PC71BM. This work demonstrates the potential of rare-earth based luminescent QDs in enhancing the PCE of polymer solar cells. Published by AIP Publishing.
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