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8791490 
Journal Article 
Iodide-reduced graphene oxide with dopant-free spiro-OMeTAD for ambient stable and high-efficiency perovskite solar cells 
Luo, Q; Zhang, Ye; Liu, C; Li, J; Wang, N; Lin, H 
2015 
1 
Journal of Materials Chemistry A
ISSN: 2050-7488
EISSN: 2050-7496 
3 
31 
15996-16004 
English 
WOS:000358722200025 
Hygroscopic lithium-bis(trifluoromethane) sulfonimide (Li-TFSI) and corrosive pyridine doped 2,2','7,7'-tetrakis(N, N-di-p-methoxy-phenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) in perovskite solar cells generally results in poor device ambient stability due to moisture-induced degradation of the perovskite absorber. Simultaneously fulfilling good ambient stability and high efficiency, this work proposes the use of a p-type and highly conductive reduced graphene oxide (RGO) reduced by ferrous iodide acid solution, combined with dopant-free spiro-OMeTAD as a hole extraction and transport material in perovskite solar cells, achieving a maximum power conversion efficiency (PCE) of 10.6%, greatly outperforming the reference devices based on pure dopant-free spiro-OMeTAD (PCE = 6.5%). Impressively, only a 15% PCE degradation is observed for the device with RGO/dopant-free spiro-OMeTAD without encapsulation after 500 h, whereas the PCE drops by 65% for the device with Li-TFSI and pyridine doped spiro-OMeTAD. This work represents a significant step toward the realization of stable and high-efficiency perovskite solar cells. 
article; aromatic amines; encapsulation; fluorenes; graphene oxide; pyridines; solar cells