Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 15, Pages 7215-7218Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am4015605
Keywords
organic solar cell; ZnO nanoparticles; PCDTBT; defects; transient photovoltage; PL lifetime
Funding
- Department of Energy Basic Energy Sciences [DE-FG0207ER46464]
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The effect of ZnO defects on photoexcited charge carrier recombination and forward induced charge transfer was studied in organic-inorganic bilayer organic heterojunction solar cells. Decreased bimolecular recombination via passivation of ZnO nanopariticle defects resulted in longer carrier lifetime as determined by transient photovoltage (TPV) measurements. It was also found by time-resolved photoluminescence (TRPL) measurements that defect passivation decreased the fluorescence lifetime which indicated higher exciton dissociation efficiency. Through passivation of the ZnO nanoparticles defects, the two loss mechanisms were reduced and the power conversion efficiency (PCE) is significantly enhanced.
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