Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 30, Pages 25589-25593Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b06717
Keywords
nonfullerene acceptors; open-circuit voltage loss; material energetics; nongeminate recombination; transient photovoltage; recombination dynamics
Funding
- National Nature Science Foundation of China [21372057, 51511130077, 51521002, 61775061]
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In this study, polymer solar cells employing poly(3-hexylthiophene) (P3HT) as a donor and fullerene derivative PC61BM (phenyl-C-61-butyric acid methyl ester) or nonfullerene diketopyrrolopyrrole (DPP)-based small molecule (SF-DPPEH) as an acceptor are investigated. Device based on SF-DPPEH shows a remarkably high V-OC of 1.20 V, whereas analogous device based on PC61BM only delivers a V-OC of 0.64 V. Employing transient photovoltage/photocurrent techniques, we measure charge carrier lifetime and density and nongeminate recombination rate in the photoactive layer and correlate material energetics and charge recombination dynamics with the change of V-OC in the devices; thus, the extent to which two factors limit V-OC can be quantified.
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