Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201807420
Keywords
> 20% PCE; dual retarding process; mixed-cation mixed halide; perovskite solar cells
Categories
Funding
- National Research Foundation of Korea (NRF) [NRF-2017R1A2B4008117]
- Leading Human Resource Training Program of Regional Neo industry through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT, and Future Planning [2016H1D5A1909787]
- Korea Research Fellowship Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT, and Future Planning [2016H1D3A1909289]
- National Research Foundation of Korea (NRF) grant - Korea government (MSIT) [2018R1C1B6008218]
- Priority Research Centre Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [NRF-2018R1A6A1A03024334]
- National Research Foundation of Korea [2016H1D5A1909787] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Mixed-cation perovskite solar cells (PSCs) have become of enormous interest because of their excellent efficiency, which is now crossing 23.7%. Their broader absorption, relatively high stability with low fabrication cost compared to conventional single phase ABX(3) perovskites (where A: organic cation; B: divalent metal ion; and X: halide anion) are key properties of mixed-halide mixed-cation perovskites. However, the controlling reaction rate and formation of extremely dense, textured, smooth, and large grains of perovskite layer is a crucial task in order to achieve highly efficient PSCs. Herein, a new simple dual-retarded reaction processing (DRP) method is developed to synthesize a high-quality mixed-cation (FAPbI(3))(0.85)(MAPbBr(3))(0.15) (where MAPbBr(3) stands for methylammonium lead bromide and FAPbI(3) stands for formamidinium lead iodide) perovskite thin film via intermediate phase and incorporation of nitrogen-doped reduced graphene oxide (N-rGO). The reaction rate is retarded via two steps: first the formation of intermediate phase and second the interaction of the nitrogen groups on N-rGO with hydrogen atoms from formamidinium cations. This DRP process allows for the fabrication of PSCs with maximum conversion efficiency higher than 20.3%.
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