Journal
NANO ENERGY
Volume 43, Issue -, Pages 117-123Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2017.11.025
Keywords
Si heterojunction solar cell; Cathodic interfacial layer; Passivating contact; Contact resistivity
Categories
Funding
- Major State Basic Research Development Program of China [2016YFB0700700]
- National Natural Science Foundation of China [61674154, 61404144]
- Zhejiang Provincial Natural Science Foundation [LR16F040002]
- Major Project and Key S&T Program of Ningbo [2016B10004]
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Dopant-free silicon (Si)/organic heterojunction solar cells (HSCs) have drawn much attention due to their immense potential in achieving high power conversion efficiencies (PCEs) with simple device architectures and fabrication procedures. However, unsatisfied rear-contacts severely hinder further improvement in PCEs for these promising HSCs. Exploring effective cathodic interfacial materials with low temperature fabrication to replace conventional diffusion layer shows the extremely importance of technical innovation. Here, poly[4,8-bis (2-ethylhexyloxyl)benzo[1,2-b: 4,5-b']dithiophene-2,6-diyl-alt-ethylhexyl-3-fluorothieno[3,4-b]thiophene-2-carboxylate-4,6-diyl] (PTB7)-based narrow band-gap conjugated polyelectrolytes, PTB7-NBr and PTB7-NSO3, are firstly employed as effective cathodic interfacial materials in Si/organic HSCs to improve the passivation and electron transporting property at n-Si/Al interface. The low-temperature proceeded electron-selective contact of n-Si/PTB7-NBr/Al gives a contact resistivity as low as 6.7 +/- 0.8 m Omega cm(2), upon it a remarkable PCE of 16.0% is finally obtained from a completely dopant-free Si/organic HSC. The understanding of conjugated polyelectrolytes on interfacial modification may lead a path to fabricate high performance Si/organic heterojunction devices with efficient charge transfer process at a simplified fabrication process.
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