Enhanced regeneration of degraded polymer solar cells by thermal annealing | Zendy

Pankaj Kumar | Zendy; Chhinder Bilen | Zendy; Krishna Feron | Zendy; Xiaojing Zhou | Zendy; Warwick J. Belcher | Zendy; Paul C. Dastoor | Zendy

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Enhanced regeneration of degraded polymer solar cells by thermal annealing

Author(s) -

Pankaj Kumar,

Chhinder Bilen,

Krishna Feron,

Xiaojing Zhou,

Warwick J. Belcher,

Paul C. Dastoor

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4878408

Subject(s) - materials science , active layer , chemical engineering , cathode , indium tin oxide , polymer solar cell , anode , annealing (glass) , organic solar cell , electrode , polymer , layer (electronics) , chemistry , nanotechnology , composite material , engineering , thin film transistor

The degradation and thermal regeneration of poly(3-hexylethiophene) (P3HT):[6,6]-phenyl-C₆₁-butyric acid methyl ester (PCBM) and P3HT:indene-C₆₀ bisadduct (ICBA) polymer solar cells, with Ca/Al and Ca/Ag cathodes and indium tin oxide/poly(ethylene-dioxythiophene):polystyrene sulfonate anode have been investigated. Degradation occurs via a combination of three primary pathways: (1) cathodic oxidation, (2) active layer phase segregation, and (3) anodic diffusion. Fully degraded devices were subjected to thermal annealing under inert atmosphere. Degraded solar cells possessing Ca/Ag electrodes were observed to regenerate their performance, whereas solar cells having Ca/Al electrodes exhibited no significant regeneration of device characteristics after thermal annealing. Moreover, the solar cells with a P3HT:ICBA active layer exhibited enhanced regeneration compared to P3HT:PCBM active layer devices as a result of reduced changes to the active layer morphology. Devices combining a Ca/Ag cathode and P3HT:ICBA active layer demonstrated ∼50% performance restoration over several degradation/regeneration cycles

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