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Degradation analysis of doped organic p-n heterojunction charge generation layers by impedance and optical spectroscopy
- Source :
- Materials Today Energy. 21:100794
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Investigation of the long-term stability of charge generation layers (CGLs) provides a fundamental and an essential approach in achieving highly efficient tandem organic electronic devices. Thus, in this foremost study, the degradation mechanism of electrically aged organic p-n heterojunction CGLs has been investigated by impedance and optical spectroscopy. Rubidium carbonate (Rb 2CO3)–doped 2,2,2-(1,3,5-benzinetriyl)-tris(1-phenyl-1H-benzimidazole) (TPBi) and molybdenum trioxide (MoO3 )–doped 1,4-bis[N-(1-naphthyl)-N′-phenylamino]-4,4′-diamine (NPB) are used as the n-type and p-type organic semiconductors , respectively. A detailed analysis from capacitance-frequency ( C–F) and capacitance-voltage (C–V) characteristics reveals reduced charge generation and 19.6% reduction in the geometric capacitance of the CGL after electrical aging. Reduced peak intensity from UV–Vis–NIR spectra of the aged CGL points to 21.4% charge transfer complex decomposition of the Rb2CO3 -doped TPBi. We propose that the rate-limiting step of charge generation in the CGL is caused by the electron transport in the TPBi:Rb 2CO3 layer and not the charge generation itself at the TPBi:Rb2CO3/NPB:MoO3 heterojunction. This simple, comprehensive, and non-destructive technique facilitates a crucial analysis that underpins the mechanism of device degradation and further provides a fundamental approach in developing highly stable CGLs for efficient organic electronic devices.
- Subjects :
- Materials science
Tandem
Renewable Energy, Sustainability and the Environment
business.industry
Materials Science (miscellaneous)
Doping
Energy Engineering and Power Technology
Heterojunction
Capacitance
Molybdenum trioxide
Organic semiconductor
chemistry.chemical_compound
Fuel Technology
Nuclear Energy and Engineering
chemistry
Optoelectronics
Rubidium carbonate
business
Spectroscopy
Subjects
Details
- ISSN :
- 24686069
- Volume :
- 21
- Database :
- OpenAIRE
- Journal :
- Materials Today Energy
- Accession number :
- edsair.doi...........ccc41b6e7bf36549ceed777f1b2e5e4f